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Title:
Probing for evolutionary links between local ULIRGs and QSOs using NIR spectroscopy
Authors:
Dasyra, K. M.; Tacconi, L. J.; Davies, R. I.; Genzel, R.; Lutz, D.; Naab, T.; Sanders, D. B.; Veilleux, S.; Baker, A. J.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany), AB(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany), AC(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany), AD(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany), AE(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany), AF(Univesitätssternwarte, Scheinerstr. 1, 81679, München, Germany), AG(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), AH(Department of Astronomy, University of Maryland, College Park, MD 20742, USA), AI(Jansky Fellow, National Radio Astronomy Observatory, Department of Astronomy, University of Maryland, College Park, MD 20742, USA)
Publication:
New Astronomy Reviews, Volume 50, Issue 9-10, p. 720-724. (NewAR Homepage)
Publication Date:
11/2006
Origin:
ELSEVIER
DOI:
10.1016/j.newar.2006.06.079
Bibliographic Code:
2006NewAR..50..720D

Abstract

We present a study of the dynamical evolution of ultraluminous infrared galaxies (ULIRGs), merging galaxies of infrared luminosity >1012 Lȯ. During our very large telescope large program, we have obtained ISAAC near-infrared, high-resolution spectra of 54 ULIRGs (at several merger phases) and 12 local Palomar-Green QSOs, to investigate whether ULIRGs go through a QSO phase during their evolution. One possible evolutionary scenario is that after nuclear coalescence, the black hole radiates close to Eddington to produce QSO luminosities. The mean stellar velocity dispersion that we measure from our spectra is similar (˜160 km/s) for 30 post-coalescence ULIRGs and 7 IR-bright QSOs. The black holes in both populations have masses of order 107 108 Mȯ (calculated from the relation to the host dispersion) and accrete at rates >0.5 Eddington. Placing ULIRGs and some IR-bright QSOs on the fundamental plane of early-type galaxies shows that they are located on a similar region (that of moderate-mass ellipticals), in contrast to giant ellipticals and radio-loud QSOs. While this preliminary comparison of the ULIRG and QSO host kinematical properties indicates that (some) ULIRGs may undergo a QSO phase in their evolutionary history before they settle down as ellipticals, further data on non-IR excess QSOs are necessary to test this scenario.
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