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JVAS B1422+231, a quad image gravitational lens



Lens System Summary

The lens redshift is 0.336 and that of the lensed object 3.62. The images show VLBI sub-structure and polarisation. The lensing galaxy belongs to a compact group of galaxies at z = 0.338. A tentative time delay has been determined from VLA monitoring.

This Lens System

Lens name B1422+231
Survey JVAS
Images 4
B1950.0 coords 14h22m21.009s 23°09'32.910"
J2000.0 coords 14h24m38.122s 22°56'00.910"

Lens System Structure and Labelling

Image labelling for this lens (RA increases to the left, declination increases upwards)

Images labelled as in Patnaik et al.

Image/Lens Positions

Image/Lens Relative Position
East (mas) North (mas)
A +390 +320
B +0.0 +0.0
C -330 -750
D +940 -810

Image/Lens Separations

Separation (mas)
Component A B C D
A
504.5 1289.7 1256.7
B 504.5
819.4 1240.8
C 1289.7 819.4
1271.4
D 1256.7 1240.8 1271.4
Position angle (°)
Component A B C D
A
50.6 33.9 -26.0
B -129.4
23.7 -49.2
C -146.1 -156.3
-87.3
D 154.0 130.8 92.7

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.

Radio maps Click to see a larger version
MERLIN 5GHz image

Radio Flux Densities

Component Flux density (mJy)
5 GHz 8.4 GHz 8.4 GHz 8.4 GHz 15 GHz
A 216±1% 148±1% 152±2 Monitoring Monitoring
B 221±1% 153±1% 164±2 " "
C 115±1% 79±1% 81±1 " "
D 4.5±10% 3.9±10% 5±0.5 " "
Flux errors




Resolution (mas) 50 220
200 ('A' config) 130 ('A' config)
390 ('B' config)
Map noise level
(mJy/beam) 		0.4 0.25
Typically 0.3 Typically 0.4
Instrument MERLIN VLA VLBA + Effelsberg VLA VLA
Date observed 1991/08/01 1991/06/16 1997/06/01
1997/06/02 		1994/03/03 to
1994/09/16 		1994/03/03 to
1994/09/16
Reference [1] [1] [10] [12] [12]

Optical Imaging

Component Brightness (Magnitudes)
K V g r F342W F480IP
A
16.71±0.01 16.92±0.07 16.77±0.07 20.08±0.01 17.09±0.01
B
16.46±0.01 16.64±0.07 16.45±0.07 19.66±0.01 16.84±0.01
C
17.26±0.01 17.44±0.07 17.25±0.07 20.34±0.01 17.52±0.01
D
20.42 20.56 20.40 23.70 20.90
Lens galaxy

>22.4 21.8±0.03 23.6±0.03 21.6±0.03
Total <12.7




Instrument Caltech 58x62 InSb
camera (Hale) 		CCD#8 (ESO/MPI 2.2m) HRCam (CFHT) HRCam (CFHT) FOC (HST) FOC (HST)
Integration time 8 exp, total
480 sec 		660 sec total 320 sec over
two exp. 		630 sec over
5 exp. 		1641.5 sec 496.5 sec
PSF size (arcsec) 0.5 0.68-1.08 0.45? 0.36-0.39

Pixel scale (mas/pixel) 314 175 111 111 14.35 14.35
Date observed 1992/03/13 1993/03/19-23 1993/04/23 1993/04/23 1995/04/21 1995/04/20
Reference no. [2] [3] [4] [4] [7] [7]

Radio Image Polarisations

Image Radio Polarisation(%) Polarisation angle(°)
8.4 GHz 8.4 GHz 8.4 GHz 8.4 GHz
A 2.75±0.1 2.4 -35±2
B 2.75±0.1 1.8 -38±2
C 2.60±0.1 1.2 -34±2
D



Resolution (mas) 220
220
Map noise level 0.25
0.25
Instrument VLA VLBA VLA VLBA
Date observed 1991/06/16? 1997/06/01
1997/06/02 		1991/06/16? 1997/06/01
1997/06/02
Reference no. [1] [10] [1] [10]

Redshifts

Object Redshift Instrument Date Observed Reference
Lens galaxy 0.3366±0.0004 LRIS (Keck II) 1997/03/30 [8]
Source 3.62 RCS (MMT) 1992/02/05 [1]

Notes

  1. Distant source: z = 3.62.

  2. Extremely bright optical source.

  3. Patnaik and Narasimha detail a VLA monitoring campaign over 197 days, detecting ~5% peak-to-peak source variability over this period from images A, B and C.

  4. Patnaik and Narasimha find that the time delay between images B and A is 1.5+-1.4 days, between A and C is 7.6+-2.5 days and between B and C is 6.2+-2.0 days.

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.


[1] B1422+231 - A new gravitationally lensed system at Z = 3.62, A. R. Patnaik et al., Mon. Not. R. Astron. Soc. (ISSN 0035-8711), vol. 259, no. 1, p. 1P-4P. (1992)


[2] Infrared observations of the gravitational lens system B1422+231, C. R. Lawrence et al., Mon. Not. R. Astron. Soc, (ISSN 0035-8711), vol. 259, no. 1, p. 5P-7P. (1992)


[3] Optical imaging of the gravitational lens system B 1422+231, M. Remy et al., Astron. & Astrophys. (ISSN 0004-6361), vol. 278, no. 1, p. L19-L22 (1993)


[4] High resolution optical imaging of the gravitational lens system B1422+231, H. K. C. Yee and E. Ellingson, Astron. J. vol. 107, no. 1, p. 28-34 (1994)


[5] Imaging and spectroscopy of B 1422+231 at C.F.H.T.: identification of the mirage and of the lensing galaxy at z= 0.647, F. Hammer et al., Astron. & Astrophys. v.298, p.737 (1995)


[6] Variability in the Gravitational Lens System B1422+231, H. K. C. Yee and J. Bechtold, Astron. J. v.111, p.1007 (1996)


[7] Hubble Space Telescope Observations of the Gravitational Lens System B1422+231, C. D. Impey et al., Astrophys. J. Let. v.462, p.L53 (1996)


[8] Redshifts of the gravitational lenses B1422+231 and PG 1115+080, J. L. Tonry, Astron. J. vol. 115, p. 1 (1998)


[9] VLBI Observations of the Gravitational Lens B1422+231, A. R. Patnaik & R. W. Porcas, Radio Emission from Galactic and Extragalactic Compact Sources, ASP Conference Series, Vol. 144, IAU Colloquium 164, eds. J.A. Zensus, G.B. Taylor, & J.M. Wrobel, p. 319. (1998)


[10] Milliarcsec-scale polarization observations of the gravitational lens B1422+231, A. R. Patnaik et al., Mon. Not. R. Astron. Soc. 307, p.L1 (1999)


[11] 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)


[12] Determination of time delay from the gravitational lens B1422+231, A. R. Patnaik and D. Narasimha, Mon. Not. R. Astron. Soc. 326, Iss. 4, p. 1403 (2001)


[13] B1422+231: The influence of mass substructure on strong lensing, M. Bradac et al., Astron. & Astrophys. 388, pp. 373-382 (2002)

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