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Title:
Ultraluminous Infrared Galaxies: QSOs in Formation?
Authors:
Tacconi, L. J.; Genzel, R.; Lutz, D.; Rigopoulou, D.; Baker, A. J.; Iserlohe, C.; Tecza, M.
Affiliation:
AA(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.), AB(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.; Department of Physics, University of California, Berkeley, CA 94720-7300.), AC(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.), AD(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.), AE(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.), AF(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.), AG(Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany.)
Publication:
The Astrophysical Journal, Volume 580, Issue 1, pp. 73-87. (ApJ Homepage)
Publication Date:
11/2002
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Elliptical and Lenticular, cD, Galaxies: Kinematics and Dynamics, Infrared: Galaxies, Galaxies: Quasars: General
DOI:
10.1086/343075
Bibliographic Code:
2002ApJ...580...73T

Abstract

We present new near-infrared (NIR) Keck and Very Large Telescope (VLT) spectroscopic data on the stellar dynamics in late-stage, ultraluminous infrared galaxy (ULIRG) mergers. We now have information on the structural and kinematic properties of 18 ULIRGs, eight of which contain QSO-like active galactic nuclei (AGNs). The host properties (σ,reff,μeff,MK) of AGN-dominated and star formation dominated ULIRGs are similar. ULIRGs fall remarkably close to the fundamental plane of early-type galaxies. They populate a wide range of the plane, are on average similar to L* rotating ellipticals, but are well offset from giant ellipticals and optically/UV-bright, low-z QSOs/radio galaxies. ULIRGs and local QSOs/radio galaxies are very similar in their distributions of bolometric and extinction-corrected NIR luminosities, but ULIRGs have smaller effective radii and velocity dispersions than the local QSO/radio galaxy population. Hence, their host masses and inferred black hole masses are correspondingly smaller. The latter are more akin to those of local Seyfert galaxies. ULIRGs thus resemble local QSOs in their NIR and bolometric luminosities because they are (much more) efficiently forming stars and/or feeding their black holes, and not because they have QSO-like, very massive black holes. We conclude that ULIRGs as a class cannot evolve into optically bright QSOs. They will more likely become quiescent, moderate mass field ellipticals or, when active, might resemble the X-ray-bright, early-type galaxies that have recently been found by the Chandra observatory. Based on observations at the European Southern Observatory, Chile, and on observations at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Keck Observatory was made possible by the general financial support by the W. M. Keck Foundation.
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