Lens System Summary
This system is unique among the JVAS/CLASS lenses, in that it displays ten lensed images. Analysis of the radio spectra of the images has shown that there are three lensed sources. One is doubly imaged and the other two are quadruply imaged, for a grand total of ten images. This system therefore imposes an abundance of constraints on any putative lens models, an advantage utilised by Cohn et al. (2001) and Muñoz, Kochanek and Keeton (2001) to intensively investigate cusped mass models. Although only 9 images are individually named in this document, radio component 2 is regarded as two merging images.
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This Lens System
Lens name
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B1933+503
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Survey
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CLASS
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Images
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10
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B1950.0 coords
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19h33m11.109s
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50°18'44.200"
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J2000.0 coords
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19h34m30.899s
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50°25'23.220"
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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
Image/Lens
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Relative Position
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East (mas)
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North (mas)
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1
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+834.5
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+793.9
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1a
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+942
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+883
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2
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+519
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+720
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3
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+8.0
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+457.0
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4
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+0.0
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+0.0
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5
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-134
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-198
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6
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+627
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-88
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7
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+795
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+165
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8
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+283
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-36
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Image/Lens Separations
Separation (mas)
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Component
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1
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1a
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2
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3
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4
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5
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6
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7
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8
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1
|
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139.6
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324.0
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892.5
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1151.8
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1386.3
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906.0
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630.1
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996.4
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1a
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139.6
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453.3
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1026.6
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1291.1
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1525.2
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1020.8
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732.9
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1130.9
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2
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324.0
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453.3
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574.7
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887.6
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1126.6
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815.2
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619.8
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792.0
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3
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892.5
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1026.6
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574.7
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457.1
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670.2
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824.7
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839.4
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564.5
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4
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1151.8
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1291.1
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887.6
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457.1
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239.1
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633.1
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811.9
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285.3
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5
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1386.3
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1525.2
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1126.6
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670.2
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239.1
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768.9
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997.4
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447.4
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6
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906.0
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1020.8
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815.2
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824.7
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633.1
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768.9
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303.7
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347.9
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7
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630.1
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732.9
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619.8
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839.4
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811.9
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997.4
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303.7
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550.0
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8
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996.4
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1130.9
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792.0
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564.5
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285.3
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447.4
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347.9
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550.0
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Position angle (°)
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Component
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1
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1a
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2
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3
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4
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5
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6
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7
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8
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1
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-129.7
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76.8
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67.8
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46.4
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44.3
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13.2
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3.6
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33.6
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1a
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50.3
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68.9
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65.5
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46.9
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44.9
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18.0
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11.6
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35.6
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2
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-103.2
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-111.1
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62.8
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35.8
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35.4
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-7.6
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-26.4
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17.3
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3
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-112.2
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-114.5
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-117.2
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1.0
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12.2
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-48.6
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-69.6
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-29.2
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4
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-133.6
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-133.1
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-144.2
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-179.0
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34.1
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-82.0
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-101.7
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-82.8
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5
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-135.7
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-135.1
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-144.6
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-167.8
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-145.9
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-98.2
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-111.3
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-111.2
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6
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-166.8
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-162.0
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172.4
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131.4
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98.0
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81.8
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-146.4
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98.6
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7
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-176.4
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-168.4
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153.6
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110.4
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78.3
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68.7
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33.6
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68.6
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8
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-146.4
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-144.4
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-162.7
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150.8
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97.2
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68.8
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-81.4
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-111.4
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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
Component
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Flux density (mJy)
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1.7 GHz
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1.7 GHz
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5 GHz
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8.4 GHz
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15 GHz
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1
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3.7
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3.6
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5.6
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4.3
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4.1
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1a
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<0.19
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0.9
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|
|
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2
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35.9
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23.0
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8.3
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4.4
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3.5
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3
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<0.19
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2.5
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4.7
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3.4
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2.5
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4
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14.2
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9.4
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19.4
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15.7
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15.5
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5
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18.7
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16.2
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7.1
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4.5
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3.9
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6
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<0.19
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2.2
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5.4
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3.6
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3.2
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7
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20.4
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20.3
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8.2
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5.2
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4.4
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8
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3.6
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3.6
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0.5
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Flux errors
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~ ±0.4 mJy
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±0.4 mJy
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±0.4 mJy
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±0.4 mJy
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±0.4 mJy
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Resolution (mas)
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6
|
120
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40, 1.5
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200
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130
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Map noise level (mJy/beam)
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0.038
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Instrument
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VLBA
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MERLIN
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MERLIN, VLBA
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VLA
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VLA
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Date observed
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1996/06/25
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1995/10/27
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1995/11/12 1995/06/23
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1994/03/02 1995/07/06
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1995/07/06 1995/08/28
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Reference
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[4]
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[1]
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[1]
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[1]
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[1]
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Optical Imaging
Component
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Brightness (Magnitudes)
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F555W (~V)
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F814W (~I)
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F160W (~H)
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1
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>24.2
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25.7
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1a
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>24.2
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>28.0
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2
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>24.2
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>28.0
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3
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>24.2
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>28.0
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4
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>24.2
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25.7
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5
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>24.2
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>28.0
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6
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>24.2
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>28.0
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7
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>24.2
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>28.0
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8
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>24.2
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>28.0
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Lensing galaxy
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~22.5
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20.6±0.2
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22
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Instrument
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WFPC2 (HST)
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WFPC2 (HST)
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NIC1/NICMOS (HST)
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Integration time
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800 sec
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1100 sec
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10495 sec
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PSF size (arcsec)
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|
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0.131
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Pixel scale (mas/pixel)
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|
|
43
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Date observed
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1995/11/11
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1995/11/11
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1997/10/09
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Reference no.
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[1]
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[1]
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[4]
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Redshifts
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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0.755
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LRIS (Keck)
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1995/09/29
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[1]
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Source
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2.638
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CGS4 (UKIRT)
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1999/06/09
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[8]
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Lens Models
Click on the model's reference number to go to the relevant paper's abstract on ADS.
[2] Nair (1998) considered a triple-component radio source with a size of a few hundred mas as the lensed object. The predicted lensing galaxy position and position angle are in good agreement with the observed galaxy position and orientation using an SIE model for the lensing galaxy.
[6] Cohn et al. (2001) modelled this system with selected cusped mass profiles.
[7] Munoz, Kochanek and Keeton (2001) extended analysis to more general cusped mass models.
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Notes
Einstein ring present in IR - large arc visible in radio
Component 2 believed to be two merging images.
Tentative evidence for variability - monitoring underway (A. D. Biggs et al.)
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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] The complex gravitational lens system B1933+503, C. M. Sykes et al., Mon. Not. R. Astron. Soc. , pp. (1997)
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[2] Modelling the 10-image lensed system B1933+503, S. Nair, Mon. Not. R. Astron. Soc. 301, Issue 2, pp. 315-322. (1998)
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[3] B1933+503, a dusty radio quasar at z>2: implications for blank field sub-mm surveys?, S. C. Chapman et al., A&A 352, p. 406-414 (1999)
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[4] NICMOS and VLBA observations of the gravitational lens system B1933+503, D. R. Marlow et al., Mon. Not. R. Astron. Soc. 305, Iss. 1, pp. 15-18 (1999)
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[5] VLA 8.4-GHz monitoring observations of the CLASS gravitational lens B1933+503, Biggs, A. D., Mon Not. R. Astron. Soc. 318, Iss. 1, pp. 73-76 (2000)
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[6] Constraints on Galaxy Density Profiles from Strong Gravitational Lensing: The Case of B1933+503, J. D. Cohn et al., Astrophys. J. 554, p. 1216 (2001)
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[7] Cusped mass models of gravitational lenses, J. A. Muñoz, C. S. Kochanek and C. R. Keeton, Astrophys. J. 558, Iss. 2, pp. 657-665 (2001)
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[8] PhD Thesis, M. Norbury (2002)
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