J0316+4328: a probable ‘asymmetric double’ lens

  1. E. R. Boyce1,*,
  2. S. T. Myers2,
  3. I. W. A. Browne1,
  4. W. J. Stroman2,3,
  5. N. J. Jackson1

Article first published online: 24 AUG 2007

DOI: 10.1111/j.1745-3933.2007.00365.x

Issue

Monthly Notices of the Royal Astronomical Society: Letters

Monthly Notices of the Royal Astronomical Society: Letters

Volume 381, Issue 1, pages L55–L59, October 2007

Additional Information

How to Cite

Boyce, E. R., Myers, S. T., Browne, I. W. A., Stroman, W. J. and Jackson, N. J. (2007), J0316+4328: a probable ‘asymmetric double’ lens. Monthly Notices of the Royal Astronomical Society: Letters, 381: L55–L59. doi: 10.1111/j.1745-3933.2007.00365.x

Author Information

  1. 1

    University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL

  2. 2

    National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA

  3. 3

    Iowa State University, Department of Physics and Astronomy, 12 Physics Hall, Ames, IA 50011, USA

* E-mail: edward.boyce@manchester.ac.uk (ERB)

Publication History

  1. Issue published online: 24 AUG 2007
  2. Article first published online: 24 AUG 2007
  3. Accepted 2007 July 16. Received 2007 June 30; in original form 2007 June 4

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Keywords:

  • gravitational lensing;
  • cosmology: miscellaneous

ABSTRACT

We report a probable gravitational lens J0316+4328, one of 19 candidate asymmetric double lenses (two images at a high flux density ratio) from CLASS. Observations with the Very Large Array (VLA), MERLIN and the Very Long Baseline Array (VLBA) imply that J0316+4328 is a lens with high confidence. It has two images separated by 0.40 arcsec, with 6-GHz flux densities of 62 mJy and 3.2 mJy. The flux density ratio of ∼19 (constant over the frequency range 6–22 GHz) is the largest for any two-image gravitational lens. High-resolution optical imaging and deeper VLBI maps should confirm the lensing interpretation and provide inputs to detailed lens models. The unique configuration will give strong constraints on the lens galaxy's mass profile.

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