1213+350 -- The Smallest Gravitational Lens or a New Class of Radio-Loud Active Galaxy?

Details 1213+350 -- The Smallest Gravitational Lens or a New Class of Radio-Loud Active Galaxy? 1213+350 -- The Smallest Gravitational Lens or a New Class of Radio-Loud Active Galaxy?

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.7003x&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #70.03; Bulletin of the American Astronomical Society, Vol. 25, p.919

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed the quasar 1213+350 (z=0.851) as part of the Caltech--Jodrell Survey (Xu et al. 1992, BAAS, 24, 1300) at frequencies 1.6 GHz, 5 GHz, 8.4 GHz and 15 GHz. The three lower-frequency maps all show two components, separated by 37 milliarcsec, having very similar spectral indices. The 1.6 GHz and 5 GHz maps show, in addition, that each of these components comprises a compact core and a weak jet. The symmetry of the objects is such that these could be images due to gravitational lensing of the quasar. The overall spectrum flattens between 8 GHz and 15 GHz so that 15 GHz observations (which are now being analyzed) should reveal whether each of the candidate ``images'' contains a flat-spectrum compact component -- which would be strong evidence for lensing. If 1213+350 is lensed, this will be the smallest gravitational lense by a factor ten, implying a lensing mass of around 10(8) M_sun. The flux-density ratio in the two ``images'' is 30:1, so that this is a rather unlikely configuration for a lensed system, given the number of objects searched. If this is not a lensed system, then it must either be a system with two centers of activity or a system in which a compact component is observed on the side of the center of activity opposite the jet -- a unique configuration. Whichever explanation pertains, it is clear that 1213+350 is a most unusual object which will merit much study.

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