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The Galaxy Merger Origin of Hot Gaseous Halos of Ellipticals

Published online by Cambridge University Press:  26 May 2016

X. Y. Xia ,
Z. Y. Huo  and
S. J. Xue
X. Y. Xia
Affiliation:
Dept. of Physics, Tianjin Normal University, Tianjin, 300074, PRC
Z. Y. Huo
Affiliation:
National Astronomical Observatories, Chinese Academy of Science, A20 Datun Road, 100012, Beijing, PRC
S. J. Xue
Affiliation:
National Astronomical Observatories, Chinese Academy of Science, A20 Datun Road, 100012, Beijing, PRC

Abstract

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We report on the properties of the hot gaseous halos of 10 nearby ultraluminous IRAS galaxies from Chandra observations. There exists diffuse soft X-ray emission surrounding the central nucleus within 10 kpc of the nuclear region with a temperature of about 0.7 keV and metallicity about Z ~ 1.0Z⊙. Also, emission lines from α elements and ions for are seen in all nearby ULIRGs in our sample. Outside the central region, the Chandra observations reveal a more extended hot gaseous halo with a temperature of about 0.6 keV and low metallicity (Z ~ 0.1Z⊙) for some of the ULIRGs. We discuss the nature and the implications of our results for the origin of X-ray halos in elliptical galaxies and the constraints this places on the feedback process.

Type
Part 3. Ejection and Outflow
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 412 - 417
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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