Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-06
Astrophys.J.611:208-219,2004
Astronomy and Astrophysics
Astrophysics
31 pages, 6 figuers, ApJ in press, accepted version
Scientific paper
10.1086/422164
We study the properties of hot gaseous halos in 10 nearby ultraluminous IRAS galaxies observed with the ACIS instrument on board Chandra. For all sample galaxies, diffuse soft X-ray emissions are found within ~10 kpc of the central region; their spectra are well fitted by a MEKAL model plus emission lines from alpha-elements and other ions. The temperature of the hot gas is about 0.7 keV and metallicity is about 1 solar. Outside the central region, extended hot gaseous halos are found for nine out of the ten ULIRGs. Most spectra of these extended halos can be fitted with a MEKAL model with a temperature of about 0.6 keV and a low metallicity (~ 0.1 solar). We discuss the implications of our results on the origin of X-ray halos in elliptical galaxies and the feedback processes associated with starbursts.
Deng Zu-Gang
Huo Zhi-Ying
Mao Shijun
Xia Xiao-Yang
Xue Sui-Jian
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