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13. Xu, Haiguang (徐海光)
Physics Building 1206
Department of Physics,
Shanghai Jiao Tong University
800 Dongchuan Road, Minhang,
Shanghai 200240, PRC
E-mail: hgxu@sjtu.edu.cn
Tel & Fax: +86-21-5474-2055
Title of talk: 2D metal distribution in the hot gas of
the compact group of galaxies HCG 62
Abstract: We present the X-ray imaging spectroscopic
study of the compact group of galaxies HCG 62 (z=0,0137)
with the high-resolution Chandra ACIS data. By using the Centroidal
Voronoi Tessellation arithmetic, we obtain the
two-dimensional distributions of the gas temperature and iron-dominated metal
abundance. We find that the X-ray emitting gas around the central galaxy is roughly
distributed in a symmetric pattern. The gas temperature is about 0.7 keV at the center and then gradually increases with radius
to about 1.2 keV in the outermost region of the
group. At about 35 kpc to the group center, there is
an arc structure where the metal abundance is remarkably high at the 90%
confidence level. The arc extends clockwise from the west of the central galaxy
to the south and is about 20 kpc in width. The
average gas temperature and abundance of this arc region are about 1.30 keV and 0.56 solar, respectively, which are higher than
those of the rest regions. Also, the metal abundance shows clear spatial
variations up to about 0.8 solar in the metal-rich arc, with its total iron
mass estimated to be of the order 1e7 solar mass. It is hard to interpret the
origin of this abundance arc in terms of the resonant scatterings due to its
asymmetry, nor is it formed by tidal or ram pressure
stripping. More possibly, it is caused by massive gas outflows triggered by
starbursts and/or merger events in history.
14.Xue, She Sheng(薛社生)
ICRAnet
Piazzale della Repubblica,
10 - 65100 Pescara,
Italy
Email: xue@icra.it
Title of talk: TBA
Abstract:
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