J0316+4328: a Probable "Asymmetric Double" Lens
E. R. Boyce (1), S. T. Myers (2), I. W. A. Browne (1), W. J. Stroman, (2, 3), N. J. Jackson (1) ((1) University of Manchester, Jodrell Bank, Observatory, (2) NRAO, (3) Iowa State University)
TL;DR
This paper reports a probable gravitational lens, J0316+4328, characterized by a high flux density ratio and unique image configuration, which can provide valuable insights into the lens galaxy's mass profile.
Contribution
It identifies and characterizes a new probable asymmetric double gravitational lens with the highest flux ratio observed, offering a promising target for detailed lens modeling.
Findings
Two images separated by 0.40" with flux densities of 62 mJy and 3.2 mJy
Flux density ratio of approximately 19, the largest for any 2-image lens
Confirmation needed from optical imaging and deeper VLBI observations
Abstract
We report a probable gravitational lens J0316+4328, one of 19 candidate asymmetric double lenses (2 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 2 images separated by 0.40", 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 2 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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