24 micron Properties of X-ray Selected AGN

Simple item page
dc.creatorRigby, J. R.
dc.creatorRieke, G. H.
dc.creatorMaiolino, R.
dc.creatorGilli, R.
dc.creatorPapovich, C.
dc.creatorPerez-Gonzalez, P. G.
dc.creatorAlonso-Herrero, A.
dc.creatorFloc'h, E. Le
dc.creatorEngelbracht, C. W.
dc.creatorGordon, K.
dc.creatorHines, D. C.
dc.creatorHinz, J. L.
dc.creatorMorrison, J. E.
dc.creatorMuzerolle, J.
dc.creatorRieke, M. J.
dc.creatorSu, K. Y.
dc.date2004-06-01
dc.date.accessioned2026-07-07T02:13:23Z
dc.date.available2026-07-07T02:13:23Z
dc.descriptionWe examine the 24 micron to X-ray color of 157 X-ray--selected AGN as a function of X-ray obscuration and optical classification in the Chandra Deep Field South. The sample consists of the Chandra hard--band detections with hard flux >10^-15 erg/s/cm^2. A deep 24 micron mosaic obtained with Spitzer provides mid--infrared fluxes for the sample. Since obscured AGN locally have higher 24 micron / 2-8 keV ratios than unobscured AGN, and since X-ray background models predict a large population of obscured AGN, we expect to find many X-ray--hard, IR--bright AGN. Instead, we find that the 24 micron to X-ray flux ratio does not depend on X-ray hardness in the full sample, nor does it differ between narrow--line and broad--line AGN. We identify 5 nearly Compton--thick AGN, and find they have similar 24 micron to X-ray flux ratios compared to the full sample. We consider AGN in the narrow redshift spikes at z~0.7; for these AGN, there is some evidence that the flux ratio increases with X-ray hardness. The redshift slice also shows an odd trend, which is also prominent in the full sample: a group of X-ray--hard AGN with very low 24 micron to X-ray flux ratios.
dc.description9 pages, 5 figures; accepted to ApJS Spitzer Special Edition
dc.identifierhttps://arxiv.org/abs/astro-ph/0406029
dc.identifierhttp://arxiv.org/abs/astro-ph/0406029
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7795
dc.subjectAstrophysics
dc.title24 micron Properties of X-ray Selected AGN
dc.typetext

Files

Collections

arXiv