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The Gravitational Lens System B1030+074. Discovery and Follow-up

Published online by Cambridge University Press:  25 May 2016

E. Xanthopoulos ,
I. W. A. Browne ,
L. J. King ,
N. J. Jackson ,
D. R. Marlow ,
P. N. Wilkinson ,
L. V. E. Koopmans ,
A. R. Patnaik  and
R. W. Porcas
E. Xanthopoulos
Affiliation:
University of Manchester, NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
I. W. A. Browne
Affiliation:
University of Manchester, NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
L. J. King
Affiliation:
University of Manchester, NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
N. J. Jackson
Affiliation:
University of Manchester, NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
D. R. Marlow
Affiliation:
University of Manchester, NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
P. N. Wilkinson
Affiliation:
University of Manchester, NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
L. V. E. Koopmans
Affiliation:
Kapteyn Astronomical Institute, P. O. Box 800, 9700 AV Groningen, The Netherlands
A. R. Patnaik
Affiliation:
Max-Planck-Institut für Radioastromomie, Auf dem Hügel 69, D 53121, Bonn, Germany
R. W. Porcas
Affiliation:
Max-Planck-Institut für Radioastromomie, Auf dem Hügel 69, D 53121, Bonn, Germany

Abstract

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We report the discovery of a new double image gravitational lens system B1030+074 which was found during the Jodrell Bank - VLA Astrometric Survey (JVAS). We have collected extensive radio data on the system using the VLA, MERLIN, the EVN and the VLBA as well as HST WFPC2 and NICMOS observations. The lensed images are separated by 1.56 arcseconds and their flux density ratio at centimetric wavelengths is approximately 14:1 although the ratio is slightly frequency dependent and the images appear to be time variable. The HST pictures show both the lensed images and the lensing galaxy close to the weaker image. The lensing galaxy has substructure which could be either part of the galaxy or a companion object. We have modeled B1030+074 using a Singular Isothermal Ellipsoid that yielded a time delay of 156/h50 days. This lens is likely to be suitable for the measurement of the Hubble constant.

Type
IV. AGN Related Phenomena
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 373 - 378
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Browne, I. W. A., Patnaik, A. R., Wilkinson, P. N., Wrobel, J. M. 1998, MNRAS, 293, 257 Google Scholar
Patnaik, A. R., Browne, I. W. A., Wilkinson, P. N., Wrobel, J. M. 1992, MNRAS, 254, 655 Google Scholar
Wilkinson, P. N., et al. 1998, submitted Google Scholar