Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1253l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Oct. 1991, p. 1253-1257, 1574. Research supported by National Academy of Scienc
Astronomy and Astrophysics
Astronomy
20
Gravitational Lenses, Infrared Sources (Astronomy), Radio Galaxies, Astronomical Models, Elliptical Galaxies, Quasars
Scientific paper
IR observations of the gravitational lens 2016 + 112 at the K band are presented. The IR image is dominated by the extended emission of the radio-quiet foreground galaxy, which acts as the gravitational lens. IR flux is seen at the location of all three radio-loud components of the system. Gaussian fits to the data yield K-band fluxes for all four components. To within the errors of the fit, the i-K colors of the ratio-loud images are similar, while the color of the foreground galaxy is closer to that expected for an elliptical galaxy with z of about 1. The relative brightnesses of the 2016 + 112 components at K band are significantly different than the optical g-band brightnesses. The K-band observation suggest that the central galaxy makes the dominant contribution to the mass acting as the gravitational lens. A model of the gravitational lens as a single massive elliptical galaxy is presented. This model suggests that all radio loud components of 2016 + 112 can be explained as images of the background quasar and are not due to a second foreground galaxy, as indicated by earlier work. Radio wavelength observations at the X band are included to show the compact radio structure of 2016 + 112, which also supports the single-galaxy lens model.
Aspin Colin
Fischer Jacqueline
Langston Glen
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