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publication

Fe K emission from the hidden quasar IRAS P09104+4109

A.C. Fabian, Y. Shioya, K. Iwasawa, K. Nandra, C. Crawford, R. Johnstone, H. Kunieda, R. McMahon, K. Makishima, T. Murayama, T. Ohashi, Y. Tanaka, Y. Taniguchi, and Y. Terashima
Abstract

We report the discovery of a strong Fe K line in the ASCA spectrum of the infrared-luminous galaxy IRAS P09104+4109 at a redshift z = 0.442. It is the most distant Fe K emission line detected so far. The large equivalent width (EW approximately 450 eV) and X-ray continuum spectrum, which has Gamma approximately equal to 2.0 with little absorption, favors a model in which the observed X-rays are scattered into our line of sight from a hidden quasar. Previous work has shown that the source has strong narrow emission lines and a highly polarized continuum in the optical and a strong infrared excess, similar to Seyfert 2 galaxies. The observed X-ray luminosity is LX is approximately equal to 2 x 1045 ergs/s in the rest frame 2-10 keV band; the large obscuration suggested by the optical and infrared studies implies that the hidden quasar has an intrinsic luminosity of LBol = 5 x 1047 ergs/s. Our results indicate that IRAS P09104+4109 is the prototype of a new class of Seyfert 2 nuclei, which emit at quasar luminosities.

 
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