Lens System Summary
VLBI observations have revealed core-jet structure in both radio images. The lensed object is a bright quasar at z = 1.019. It has been detected as an X-ray source in the Northern ROSAT All-Sky Survey (Brinkman et al. 1997). HST pictures have located the lensing galaxy and a faint companion.
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This Lens System
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Lens name
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B1152+199
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Survey
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CLASS
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Images
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2
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B1950.0 coords
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11h52m43.914s
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19°56'24.010"
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J2000.0 coords
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11h55m18.297s
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19°39'42.230"
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Lens System Structure and Labelling
Image labelling for this lens (RA increases to the left, declination increases upwards)
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Image/Lens Positions
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Image/Lens
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Relative Position
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East (mas)
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North (mas)
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A
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+0.0
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+0.0
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Acore
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+0.0
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+0.0
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Ajet
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+11.5±0.1
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+0.6±0.1
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B
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+935±5
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-1248±50
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Bcore
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+935.3±0.1
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-1245.4±0.1
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Bjet
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939.4±0.1
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-1249.4±0.1
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C
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-23085±36
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-144±38
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G
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+554±10
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-991±10
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X
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-37±10
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-1046±10
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Image/Lens Separations
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Separation (mas)
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Component
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A
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Acore
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Ajet
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B
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Bcore
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Bjet
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C
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G
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X
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A
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0.0
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11.5
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1559.4
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1557.5
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1563.2
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23085.4
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1135.3
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1046.7
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Acore
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0.0
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11.5
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1559.4
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1557.5
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1563.2
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23085.4
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1135.3
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1046.7
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Ajet
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11.5
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11.5
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1553.0
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1551.1
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1556.8
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23097.0
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1130.3
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1047.7
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B
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1559.4
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1559.4
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1553.0
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2.6
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4.6
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24045.4
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459.6
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992.8
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Bcore
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1557.5
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1557.5
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1551.1
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2.6
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5.7
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24045.5
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458.4
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992.5
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Bjet
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1563.2
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1563.2
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1556.8
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4.6
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5.7
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24049.8
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464.0
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997.4
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C
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23085.4
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23085.4
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23097.0
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24045.4
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24045.5
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24049.8
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23654.2
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23065.6
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G
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1135.3
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1135.3
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1130.3
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459.6
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458.4
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464.0
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23654.2
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593.6
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X
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1046.7
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1046.7
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1047.7
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992.8
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992.5
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997.4
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23065.6
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593.6
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Position angle (°)
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Component
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A
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Acore
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Ajet
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B
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Bcore
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Bjet
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C
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G
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X
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A
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0.0
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-93.0
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-36.8
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-36.9
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-36.9
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89.6
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-29.2
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2.0
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Acore
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0.0
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-93.0
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-36.8
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-36.9
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-36.9
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89.6
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-29.2
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2.0
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Ajet
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87.0
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87.0
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-36.5
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-36.6
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-36.6
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89.6
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-28.7
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2.7
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B
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143.2
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143.2
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143.5
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-173.4
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-72.3
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92.6
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124.0
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101.7
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Bcore
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143.1
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143.1
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143.4
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6.6
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-45.7
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92.6
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123.7
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101.6
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Bjet
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143.1
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143.1
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143.4
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107.7
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134.3
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92.6
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123.8
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101.8
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C
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-90.4
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-90.4
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-90.4
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-87.4
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-87.4
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-87.4
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-87.9
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-87.8
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G
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150.8
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150.8
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151.3
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-56.0
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-56.3
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-56.2
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92.1
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84.7
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X
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-178.0
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-178.0
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-177.3
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-78.3
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-78.4
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-78.2
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92.2
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-95.3
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Maps and Images
Click on an image to see a larger JPEG version, or click on the accompanying text to
download a gzipped FITS or PostScript file of the map or image. The images and maps are
available in one gzipped file here.
To see a DSS image of the region around this lens, click here - note that you will have to start the search manually by clicking on the 'Search' button.
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Radio Flux Densities
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Component
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Flux density (mJy)
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1.4 GHz
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5 GHz
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5 GHz
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8.4 GHz
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8.4 GHz
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15 GHz
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15 GHz
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A
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50.8±0.4
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55.2±0.1
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52.27
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48.5±0.1
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43.78
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43.0±0.3
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Acore
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33.4±0.2
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Ajet
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17.1±0.1
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B
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17.1±0.4
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18.6±0.1
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17.23
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15.6±0.1
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14.34
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14.5±0.3
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Bcore
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11.9±0.1
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Bjet
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5.0±0.1
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C
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2.34
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1.20
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Flux errors
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3%
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5%
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Resolution (mas)
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67
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210
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210
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Map noise level
(mJy/beam)
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0.070
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0.075
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0.16
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0.1
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0.25
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0.3
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Instrument
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VLA
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MERLIN
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VLBA
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VLA
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VLA
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VLA
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VLA
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Date observed
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1999/07/15
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1999/01/02
1999/01/05
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2001/02/27
2001/03/18
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1998/04/03
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1999/07/15
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1998/04/05
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1999/07/15
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Reference
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[4]
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[4]
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[4]
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[1]
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[4]
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[1]
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[4]
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Sub-millimetre Flux Densities
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Component
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Flux density (mJy)
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850 μm
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450 μm
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Total
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<6.5
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<70
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Estimated
cal. error
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5-10%
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5-10%
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Instrument
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SCUBA (JCMT)
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SCUBA (JCMT)
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Date observed
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1999-2001
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1999-2001
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Reference
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[5]
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[5]
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Optical Imaging
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Component
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Brightness (Magnitudes)
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i
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g
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U
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B
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V
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V
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R
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R
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I
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I
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z'
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A
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16.6
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16.5
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16.75±0.04
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17.00±0.02
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17.28±0.03
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<17.3
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16.42±0.02
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16.38±0.02
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<16.7
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B
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21.73±0.03
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21.9±0.3
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20.20±0.04
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19.26±0.03
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19.9±0.3
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G
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22.6±0.3
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19.6±0.3
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X
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25.0±0.3
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23.1±0.3
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Bmag - Amag
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19.61±0.04
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19.18±0.04
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Gmag - Amag
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4.1±0.2
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Instrument
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COSMIC (Palomar 5-m)
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COSMIC (Palomar 5-m)
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ALFOSC (NOT)
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ALFOSC
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ALFOSC
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WFPC2 (HST)
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ALFOSC
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OIG (3.5-m TNG)
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ALFOSC
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WFPC2 (HST)
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ALFOSC
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Integration time
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2700 sec
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1500s
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1000s
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4 exp. of
500s each
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600s
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1320 sec in 5 exp.
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600s
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4 exp. of
500s each
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900s
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PSF size (arcsec)
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1.1
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1.1
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1.3
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0.6
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0.8
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Pixel scale (mas/pixel)
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|
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188
|
188
|
188
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|
188
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144
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188
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188
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Date observed
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1998/05/31
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1998/05/31
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1999/06/25
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1999/06/25
1999/07/02
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1999/06/25
1999/07/02
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2000/03/28
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1999/06/23
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2000/03/29
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1999/06/23
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2000/03/28
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1999/06/25
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Reference no.
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[1]
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[1]
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[2]
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[2]
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[2]
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[4]
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[2]
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[3]
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[2]
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[4]
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[2]
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Redshifts
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Object
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Redshift
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Instrument
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Date Observed
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Reference
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Lens galaxy
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0.4386±0.0008
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LRIS (Keck II)
|
1998/04/21
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[1]
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Source
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1.0189±0.0004
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LRIS (Keck II)
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1998/04/21
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[1]
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Lens Models
Click on the model's reference number to go to the relevant paper's abstract on ADS.
[4] Rusin et al. utilise the extra constraints available from VLBA observations to model this system with a singular power-law ellipsoid (SPLE) mass distribution, that predicts a 35.9+-2.0 h-1 time delay between the images. Inclusion of a second mass distribution at the position of X reduces the time delay by 15-25%. Both models have NDF=0. The power law exponent for the surface mass distribution (Σ(r) α r-β) is limited to 0.95 ≤ β ≤ 1.21 (2σ) when X is not included in the model.
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Notes
Component C probably unrelated to lens.
Toft, Hjorth and Burud detected A, B and the lens galaxy in z', but lacked standard photometry in this band.
Rusin et al. detect a faint extended object West of the lensing galaxy in HST imaging. In addition, they note a diffuse arc West of image B.
Rusin et al. suggest that substructure may be responsible for the apparent bending of the jet in image B compared to image A, and recommend deeper imaging at higher resolution.
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References
Click here to see the CASTLES data available for this object, or here to search for references on NED. You can go to a paper's abstract on ADS by clicking its reference number.
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[1] CLASS B1152+199 and B1359+154: Two New Gravitational Lens Systems Discovered in the Cosmic Lens All-Sky Survey, S. T. Myers et al., Astron. J. 117, Issue 6, pp. 2565-2572 (1999)
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[2] The extinction curve of the lensing galaxy of B1152+199 at z = 0.44, S. Toft, J. Hjorth and I. Burud, Astron. & Astrophys. 357, pp. 115-119 (2000)
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[3] Subarcsecond Optical Images of the Radio Gravitational Lens B1152+199, J. A. Muñoz et al., Astrophys. J. 563, pp. L107-L109 (2001)
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[4] High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199, D. Rusin et al., Mon. Not. R. Astron. Soc. 330, pp. 205-211 (2002)
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[5] A submillimeter survey of gravitationally lensed quasars, R. Barvainis and R. Ivison, Astrophys. J. 571, pp. 712-720 (2002)
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