SIMBAD references

1999ApJ...527..709I - Astrophys. J., 527, 709-718 (1999/December-3)

Hard X-ray luminosities of multinuclei infrared luminous galaxies showing a Radio/Far-infrared excess.


Abstract (from CDS):

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 µm) and infrared (8-1000 µm) 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.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Interactions - Radio Continuum: Galaxies - X-Rays: Galaxies

Simbad objects: 57

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