The Nature of Luminous X-Ray Sources with Mid-Infrared Counterparts

Bibcode
2004ApJS..154..155A
DOI
10.1086/422976
Alonso-Herrero, A.; Pérez-González, P. G.; Rigby, J.; Rieke, G. H.; Le Floc'h, E.; Barmby, P.; Page, M. J.; Papovich, C.; Dole, H.; Egami, E.; Huang, J.-S.; Rigopoulou, D.; Cristóbal-Hornillos, D.; Eliche-Moral, C.; Balcells, M.; Prieto, M.; Erwin, P.; Engelbracht, C. W.; Gordon, K. D.; Werner, M.; Willner, S. P.; Fazio, G. G.; Frayer, D.; Hines, D.; Kelly, D.; Latter, W.; Misselt, K.; Miyazaki, S.; Morrison, J.; Rieke, M. J.; Wilson, G.
Bibliographical reference

The Astrophysical Journal Supplement Series, Volume 154, Issue 1, pp. 155-159.

Advertised on:
9
2004
Number of authors
31
IAC number of authors
5
Citations
39
Refereed citations
35
Description
We investigate the luminous X-ray sources in the Lockman Hole (LH) and the extended Groth strip (EGS) detected at 24 μm using the Multiband Imaging Photometer (MIPS) and also with the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope. We assemble optical/infrared spectral energy distributions (SEDs) for 45 X-ray/24 μm sources in the EGS and LH. Only about one-quarter of the hard X-ray/24 μm sources show pure type 1 active galactic nucleus (AGN) SEDs. More than half of the X-ray/24 μm 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 24 μm 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 AGNs means that AGNs 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 AGNs.
Type
Refereed
Galaxies

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