Lens System Summary
CLASS B1555+375 is a quad-image gravitational lens system.
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This Lens System
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Lens name
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B1555+375
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Survey
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CLASS
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Images
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4
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B1950.0 coords
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15h55m22.030s
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37°30'10.942"
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J2000.0 coords
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15h57m11.940s
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37°21'35.965"
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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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B
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-72.6±1
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+48.0±1
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C
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-411.7±1
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-28.0±1
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D
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-161.9±6
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-368.0±6
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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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B
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C
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D
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A
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87.0
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412.7
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402.0
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B
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87.0
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347.5
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425.5
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C
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412.7
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347.5
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421.9
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D
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402.0
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425.5
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421.9
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Position angle (°)
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Component
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A
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B
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C
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D
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A
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123.5
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86.1
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23.7
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B
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-56.5
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77.4
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12.1
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C
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-93.9
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-102.6
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-36.3
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D
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-156.3
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-167.9
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143.7
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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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5 GHz
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8.4 GHz
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15 GHz
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A+B
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36.1
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A
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17.0
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27.0
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B
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9.7
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15.2
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C
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8.3
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9.6
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11.4
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D
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1.3
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2.1
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Flux errors
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|
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Resolution (mas)
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50
|
250
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150
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Map noise level
(mJy/beam)
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0.06
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0.14
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0.27
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Instrument
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MERLIN
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VLA
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VLA
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Date observed
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1997/12/01
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1995/08/16
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1998/05/15
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Reference
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[1]
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[1]
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[1]
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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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<6.8
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<39
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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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[2]
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[2]
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Optical Imaging
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Component
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Brightness (Magnitudes)
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R
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H
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Total
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~25
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~19
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Instrument
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LRIS (Keck II)
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WHT
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Integration time
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2 exp, 5 min each
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5 exp, 20 min total
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PSF size (arcsec)
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|
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Pixel scale (mas/pixel)
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|
240
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Date observed
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1998/08/02
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1997/08/24
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Reference no.
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[1]
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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.
[1] Marlow et al. fitted a singular isothermal ellipsoid mass profile without external shear to the lens system.
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Notes
Currently no redshifts are available for this system.
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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 B1555+375: A new four-image gravitational lens, D. R. Marlow et al., Astron. J. 118, pp. 654-658 (1999)
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[2] A submillimeter survey of gravitationally lensed quasars, R. Barvainis and R. Ivison, Astrophys. J. 571, pp. 712-720 (2002)
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