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Published March 15, 1981 | Published
Journal Article Open

The triple quasar Q1115+080A, B, C - A quintuple gravitational lens image


Spectroscopy and direct imaging of Qll 15+080A,B,C with a CCD camera supports the hypothesis that they are gravitational images of a single object. Spectroscopy of the C III] λ1909 emission line shows all the images to have identical spectra and redshifts (to within 100 km s^(-1)), except that Bis slightly redder. The position and brightness of the three images has been accurately measured; the images A, B, and Care magnitudes 16.30,18.64, and 18.17, respectively, in the r band, B is 1". 77 from A in position angle 266°, and C is 2".28 away at position angle 322°. A and C have the same color, but B is redder by 0.23 mag in (g-r). There is no trace of a lens galaxy, which must have a surface brightness of less than 29 mag arcsec^(-2) at a distance of 5" -8" from Q1115+080. Three bright galaxies lie near Q1115+080, apparently forming a small group. Gravitational lens imaging by a massive spiral galaxy is explored, and we find a quintuple image model resembling Q1115+080 A,B,C. In this model, Q1115+080A is a highly magnified close pair of images oriented in position angle 23°. An elongation of Q1115+080A at this angle is seen in the CCD pictures.

Additional Information

© 1981 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1980 July 28; accepted 1980 October 1. We thank Ray Weymann for sending us a preprint in time to allow us to observe the Ql 115+080 at the end of its season. We thank Don Schneider for running the CCD data system during the observing run, and Walt Morgan and Skip Staples for assistance at the telescope. This research was supported in part by the National Science Foundation grants AST 76-80801, 78-24842, 77-04182, and 80-03398, and by the National Aeronautics and Space Administration through contract NGL05-002-134.

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Published - 1981ApJ___244__723Y.pdf


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October 19, 2023