Lens System Summary
B1030+074 is a double-image lens that was discovered in the JVAS survey. Jet structure in the source has been revealed by VLBI. This system has the highest flux density ratio between its images of all the JVAS/CLASS lenses (15:1) and consequently is not included in the CLASS statistically complete sample, which excludes systems with flux ratios above 10:1. Monitoring has failed to produce a time delay (Xanthopoulos et al., in prep.).
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This Lens System
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Lens name
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B1030+074
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Survey
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JVAS
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Images
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2
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B1950.0 coords
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10h30m57.071s
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07°26'55.760"
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J2000.0 coords
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10h33m34.025s
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07°11'26.122"
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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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+934.3
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-1258
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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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A
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1567.0
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B
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1567.0
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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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A
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-36.6
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B
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143.4
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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
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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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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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22 GHz
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22 GHz
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A
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147
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186
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173
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326
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248
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202
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197
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208
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295
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184
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219
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B
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8.1
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9.8
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10.9
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27.3
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19.1
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16.0
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12.9
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14.8
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24.4
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15.3
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12.2
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Flux errors
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5%
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5%
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5%
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5%
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5%
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5%
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5%
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5%
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5%
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5%
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5%
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Resolution (mas)
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15
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150
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5
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50
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3
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240
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240
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140
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140
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80
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80
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Map noise level
(mJy/beam)
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Instrument
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EVN
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MERLIN
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EVN
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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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VLA
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VLA
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Date observed
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1994/05/15
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1993/09/27
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1994/11/18
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1996/12/27
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1995/11/12
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1992/10/17
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1994/02/22
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1994/02/22
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1995/12/20
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1994/02/22
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1995/12/19
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Reference
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[1]
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[1]
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[1]
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[1]
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[1]
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[1]
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[1]
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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
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Component
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Brightness (Magnitudes)
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V
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I
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H
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A
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20.34
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18.75
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19.6
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B
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24.10
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22.17
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23.5
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Lensing galaxy
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~22
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20.44±0.1 in
1.2"x0.6" ellipse
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21.2
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Instrument
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WFPC2 (HST)
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WFPC2 (HST)
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NICMOS (HST)
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Integration time
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2ex of 500s each
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2ex of 500s each
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1ex of 2048s, 1ex of 576s
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PSF size (arcsec)
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Pixel scale (mas/pixel)
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0.045
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0.045
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Date observed
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1997/02/03
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1997/02/03
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1997/11/22
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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
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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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1.535
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LRIS (Keck II)
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1997/02/14
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[2]
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Source
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0.5990
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LRIS (Keck II)
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1997/02/14
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[2]
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Notes
Source is variable, time delay (if any) undetermined as yet.
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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 new gravitational lens system B1030+074, E. Xanthopoulos et al., Mon. Not. R. Astron. Soc. 300, 649-655 (1998)
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[2] Keck spectroscopy of three gravitational lens systems discovered in the JVAS and CLASS surveys, C. D. Fassnacht and J. G. Cohen, Astron. J. vol. 115, p. 377 (1998)
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[3] Gravitationally lensed radio sources in the Jodrell Bank-VLA Astrometric Survey, L. J. King et al., Mon. Not. R. Astron. Soc. 307, pp. 225-235 (1999)
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[4] NICMOS images of JVAS/CLASS gravitational lens systems, N. Jackson et al., Mon. Not. R. Astron. Soc. 311, pp. 389-396 (2000)
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