your ID: 0308 
First Name: Zhongli 
Last Name: Zhang 
Affiliation: Shanghai Jiao Tong University 

Title: Metal Distributions in Early-Type Galaxies 
Authors: Z. Zhang, J. Gu, H. Xu 
Topic: 4 
Session: oral 

Abstract: 
By analyzing the high-quality Chandra ACIS data we studied the spatial 
distributions of gas temperature and abundance in the compact group of 
galaxies HCG 62. We find that there is a remarkable high-abundance arc 
region at about 35 kpc from the group\'s center, which coincides with one 
of the X-ray cavities and a jet-like structure identified on the 1.43 GHz radio 
map. Incorporating with the optical evidence we argue that this high-abundance 
region was formed during a minor merger event, which moves about several 
1E6 M_Sun of iron outwards from the group\'s innermost region where the iron 
was mostly synthesized in SNe Ia. The off-center metal distribution also has been 
confirmed in our study of a sample of 9 early-type galaxies. We find that in these 
galaxies the gas entropy correlateswith the B-band luminosity loosely, indicating 
the importance of mergers in the gas heating and metal outflows.