[O I] 63 micron Emission from High and Low Luminosity AGN Galaxies

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dc.creatorDale, Daniel A.
dc.creatorHelou, George
dc.creatorBrauher, James R.
dc.creatorCutri, Roc M.
dc.creatorMalhotra, Sangeeta
dc.creatorBeichman, Charles A.
dc.date2003-12-09
dc.date.accessioned2026-07-07T11:29:18Z
dc.date.available2026-07-07T11:29:18Z
dc.descriptionThe Infrared Space Observatory was used to search for a tracer of the warm and dense neutral interstellar medium, the [O I] 63.18 micron line, in four ultraluminous IRAS sources lying at redshifts between 0.6 and 1.4. While these sources are quasars, their infrared continuum emission suggests a substantial interstellar medium. No [O I] flux was securely detected after probing down to a 3 sigma sensitivity level sufficient for detecting line emission in starbursts with similar continuum emission. However, if the detection threshold is slightly relaxed, one target is detected with 2.7 sigma significance. For this radio-quiet quasar there is likely a substantial dense and warm interstellar medium; the upper limits for the three radio-loud sources do not preclude the same conclusion. Using a new, uniformly-processed database of the ISO extragalactic far-infrared spectroscopy observations, it is shown that nearby Seyfert galaxies typically have higher [O I]-to-far-infrared ratios than do normal star-forming galaxies, so the lack of strong [O I] 63 micron emission from these high-redshift ultraluminous sources cannot be attributed to their active cores.
dc.description18 pages including 4 figures; accepted for publication in the Astrophysical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0312247
dc.identifierhttp://arxiv.org/abs/astro-ph/0312247
dc.identifierAstrophys.J.604:565-571,2004
dc.identifierdoi:10.1086/381959
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196668
dc.subjectAstrophysics
dc.title[O I] 63 micron Emission from High and Low Luminosity AGN Galaxies
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