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Date and Time of the Query: 2019-06-20 T14:17:31 PDT
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For refcode 1999ApJ...527..709I:
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1999ApJ...527..709I Hard X-Ray Luminosities of Multinuclei Infrared Luminous Galaxies Showing a Radio/Far-Infrared Excess Masatoshi Imanishi National Astronomical Observatory, Mitaka, Tokyo, 181-8588, Japan and Shiro Ueno Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, England, UK Received 1999 March 22; accepted 1999 August 9 ABSTRACT We report the results of hard X-ray observations of four multinuclei merging infrared luminous galaxies (IRLGs). We selected these four sources for their excess of radio-to-far-infrared luminosity ratio compared with starburst galaxies. This excess suggests that activity associated with a supermassive black hole (SMBH) contributes strongly to the IRLGs' bolometric luminosities. Although we expect strong hard X-ray emission from the SMBH-driven activity, the radio-excess multinuclei merging IRLGs show considerably smaller hard X-ray luminosities relative to far-infrared (40- 500 micron) and infrared (8-1000 micron) luminosities than active galactic nuclei (AGNs) showing a similar radio excess. This result may demonstrate that emission in the hard X-ray region from SMBH-driven activity in the multinuclei merging IRLGs is severely suppressed compared to a typical spectral energy distribution of SMBH-driven activity in AGNs. If this is a common property of merging IRLGs, without taking this into account, hard X- ray observations underestimate the contribution of SMBH-driven activity to the bolometric luminosities of merging IRLGs. Subject headings: galaxies: active-galaxies: interactions-radio continuum: galaxies-X-rays: galaxies
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