High-ionization Fe K emission from luminous infrared galaxies

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dc.creatorIwasawa, K.
dc.creatorSanders, D. B.
dc.creatorEvans, A. S.
dc.creatorMazzarella, J. M.
dc.creatorArmus, L.
dc.creatorSurace, J. A.
dc.date2009-03-09
dc.date2009-03-10
dc.date.accessioned2026-07-07T13:16:41Z
dc.date.available2026-07-07T13:16:41Z
dc.descriptionThe Chandra component of the Great Observatories All-Sky LIRG Survey (GOALS) presently contains 44 luminous and ultraluminous infrared galaxies with log (Lir/Lsun) = 11.73-12.57. Omitting 15 obvious AGNs, the other galaxies are, on average, underluminous in the 2-10 keV band by 0.7 dex at a given far-infrared luminosity, compared to nearby star-forming galaxies with lower star formation rates. The integrated spectrum of these hard X-ray quiet galaxies shows strong high-ionization Fe K emission (Fe XXV at 6.7 keV), which is incompatible with X-ray binaries as its origin. The X-ray quietness and the Fe K feature could be explained by hot gas produced in a starburst, provided that the accompanying copious emission from high-mass X-ray binaries is somehow suppressed. Alternatively, these galaxies may contain deeply embedded supermassive black holes that power the bulk of their infrared luminosity and only faint photoionized gas is visible, as seen in some ULIRGs with Compton-thick AGN.
dc.description4 pages, 2 figures, ApJ Letters in press
dc.identifierhttps://arxiv.org/abs/0903.1503
dc.identifierhttp://arxiv.org/abs/0903.1503
dc.identifierAstrophysical Journal, Letters 695, 103 (2009)
dc.identifierdoi:10.1088/0004-637X/695/1/L103
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230871
dc.subjectAstrophysics of Galaxies
dc.subjectHigh Energy Astrophysical Phenomena
dc.titleHigh-ionization Fe K emission from luminous infrared galaxies
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