Infrared K-band observations of the gravitational lens 2016 + 112

Astronomy and Astrophysics – Astronomy

Scientific paper

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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.

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