The Nature of Luminous X-ray Sources with Mid-infrared Counterparts
نویسندگان
چکیده
We investigate the luminous X-ray sources in the Lockman Hole (LH) and the Extended Groth Strip (EGS) detected at 24μm using MIPS and also with IRAC on board Spitzer. We assemble optical/infrared spectral energy distributions (SEDs) for 45 X-ray/24μm sources in the EGS and LH. Only about 1/4 of the hard X-ray/24μm sources show pure type 1 AGN SEDs. More than half of the X-ray/24μm sources have stellar-emission-dominated or obscured SEDs, similar to those of local type 2 AGN and spiral/starburst galaxies. One-third of the sources detected in hard X-rays do not have a 24μm counterpart. Two such sources in the LH have SEDs resembling those of S0/elliptical galaxies. The broad variety of SEDs in the optical-to-Spitzer bands of X-ray selected AGN means that AGN selected according to the behavior in the optical/infrared will have to be supplemented by other kinds of data (e.g., X-ray) to produce unbiased samples of AGN. Subject headings: Infrared: galaxies — X-rays: galaxies — galaxies: active
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