A nearly symmetric double-image gravitational lens

Details A nearly symmetric double-image gravitational lens A nearly symmetric double-image gravitational lens

2000-09-28

arxiv.org/abs/astro-ph/0009451v2

Astronomy and Astrophysics

Astrophysics

17 pp., 5 bitmapped figs. (contact jnwinn@mit.edu for nicer figs), in press, A.J. (substantially revised)

Scientific paper

10.1086/319403

We report the discovery of a new double-image gravitational lens resulting from our search for lenses in the southern sky. Radio source PMN J2004-1349 is composed of two compact components separated by 1.13 arcseconds in VLA, MERLIN and VLBA images. The components have a flux ratio of 1:1 at radio frequencies ranging from 5 GHz to 22 GHz. The I-band optical counterpart is also an equal double, with roughly the same separation and position angle as the radio double. Upon subtraction of the components from the I-band image, we identify a dim pattern of residuals as the lens galaxy. While the present observations are sufficient to establish that J2004-1349 is a gravitational lens, additional information will be necessary (such as the redshifts of the galaxy and quasar, and precise astrometry and photometry of the lens galaxy) before constructing detailed mass models.

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