Chandra Observations of SDSS J1004+4112: Constraints on the Lensing Cluster and Anomalous X-Ray Flux Ratios of the Quadruply Imaged Quasar

astro-ph

/ Authors

N. Ota, N. Inada, M. Oguri, K. Mitsuda, G. T. Richards, Y. Suto, W. N. Brandt, F. J. Castander, R. Fujimoto, P. B. Hall

and 8 more authors

C. R. Keeton, R. C. Nichol, D. P. Schneider, D. E. Eisenstein, J. A. Frieman, E. L. Turner, T. Minezaki, Y. Yoshii

/ Abstract

We present results from Chandra observations of SDSS J1004+4112, a strongly lensed quasar system with a maximum image separation of 15". All four bright images of the quasar, as well as resolved X-ray emission originating from the lensing cluster, are clearly detected. The emission from the lensing cluster extends out to approximately 1.5 arcmin. We measure the bolometric X-ray luminosity and temperature of the lensing cluster to be 4.7e44 erg s^-1 and 6.4 keV, consistent with the luminosity-temperature relation for distant clusters. The mass estimated from the X-ray observation shows excellent agreement with the mass derived from gravitational lensing. The X-ray flux ratios of the quasar images differ markedly from the optical flux ratios, and the combined X-ray spectrum of the images possesses an unusually strong Fe Kalpha emission line, both of which are indicative of microlensing.