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2005AJ....130.2019O - Astron. J., 130, 2019-2042 (2005/November-0)
Optical identification of infrared space observatory far-infrared sources in the Lockman hole using a deep very large array 1.4 GHz continuum survey.
OYABU S., YUN M.S., MURAYAMA T., SANDERS D.B., KAWARA K., TANIGUCHI Y., VEILLEUX S., OKUDA H., MATSUHARA H., COWIE L.L., SATO Y., WAKAMATSU K. and SOFUE Y.
Abstract (from CDS):
At least seven of our FIR sources show evidence for the presence of an active galactic nucleus (AGN) in optical emission lines, radio continuum excess, or X-ray activity. Three out of five (60%) of the ULIRGs/HyLIRGs are AGN galaxies, suggesting that the AGN fraction among the ULIRG/HyLIRG population may not change significantly between z∼0.5 and the present epoch. Five of the seven AGN galaxies are within the ROSAT X-ray survey field, and two are within the XMM-Newton survey fields. X-ray emission has been detected in only one source, 1EX030, which is optically classified as a quasar. The nondetection in the XMM-Newton 2-10 keV band suggests a very thick absorption column density of 3x1024/cm2 or AV∼1200 mag obscuring the central source of the two AGN galaxies. Several sources have an extreme FIR luminosity relative to the optical R band, L(90 µm)/L(R)>500, which is rare even among the local ULIRG population. While source confusion or blending might offer an explanation in some cases, these observations may represent a new population of galaxies with an extreme amount of star formation in an undeveloped stellar system, i.e., formation of bulges or young elliptical galaxies.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Evolution - Galaxies: Starburst - Infrared: Galaxies
Nomenclature: Table 2, col(3): [OYM2005] REX NN (Nos 1-31), [OYM2005] RNW NN (Nos 1-15).
Simbad objects: 80
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