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Title:
Dynamical Properties of Ultraluminous Infrared Galaxies. II. Traces of Dynamical Evolution and End Products of Local Ultraluminous Mergers
Authors:
Dasyra, K. M.; Tacconi, L. J.; Davies, R. I.; Naab, T.; Genzel, R.; Lutz, D.; Sturm, E.; Baker, A. J.; Veilleux, S.; Sanders, D. B.; Burkert, A.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany.), AB(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany.), AC(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany.), AD(Universitätssternwarte, Scheinerstrasse 1, 81679 Munich, Germany.), AE(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany.), AF(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany.), AG(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741, Garching, Germany.), AH(Jansky Fellow, National Radio Astronomy Observatory.; Department of Astronomy, University of Maryland, College Park, MD 20742.), AI(Department of Astronomy, University of Maryland, College Park, MD 20742.), AJ(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822.), AK(Universitätssternwarte, Scheinerstrasse 1, 81679 Munich, Germany.)
Publication:
The Astrophysical Journal, Volume 651, Issue 2, pp. 835-852. (ApJ Homepage)
Publication Date:
11/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Formation, Galaxies: Kinematics and Dynamics, Infrared: Galaxies, ISM: Kinematics and Dynamics
DOI:
10.1086/507834
Bibliographic Code:
2006ApJ...651..835D

Abstract

We present results from our Very Large Telescope large program to study the dynamical evolution of local ultraluminous infrared galaxies (ULIRGs) and QSOs. This paper is the second in a series presenting the stellar kinematics of 54 ULIRGs, derived from high-resolution, long-slit H- and K-band spectroscopy. The data presented here, including observations of 17 new targets, are mainly focused on sources that have coalesced into a single nucleus. The stellar kinematics, extracted from the CO ro-vibrational band heads in our spectra, indicate that ULIRG remnants are dynamically heated systems with a mean dispersion of 161 km s-1. The combination of kinematic, structural, and photometric properties of the remnants indicate that they mostly originate from major mergers and that they result in the formation of systems supported by random motions, i.e., elliptical galaxies. The peak of the velocity dispersion distribution and the locus of ULIRGs on the fundamental plane of early-type galaxies indicate that the end products of ultraluminous mergers are typically moderate-mass ellipticals (of stellar mass ~1010-1011 Msolar). Converting the host dispersion into black hole mass with the aid of the MBH-σ relation yields black hole mass estimates of the order 107-108 Msolar and high accretion rates with Eddington efficiencies often >0.5.

Based on observations at the European Southern Observatory (ESO) (171.B-044).

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