|
|||||
|
|
Chandra imaging spectroscopy of the central region of AWM7 |
|
| Authors: | T Furusho NY Yamasaki T Ohashi |
| Institution: | aNASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA bInstitute of Space and Astronautical Science (ISAS), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan cDepartment of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan |
| Abstract: | We report on the results of Chandra observations of the galaxy cluster AWM7. The ACIS image reveals new substructures with a spatial extent of more than 8″ (4 kpc at AWM7) near the cD galaxy center, represented by a hard sub-peak and a soft peak. These substructures suggest that a dynamical process related to the formation of the cD galaxy is now taking place. Inside the cluster core within a radius of 2′, annular spectra with every 10″ step are fitted well by single temperature models. The temperature gradually drops from 4.2 keV at a radius of 60 kpc (2′) to 1.8 keV at the cluster center. The radial abundance profile shows a gradient with a peak metallicity of 1.5 solar at a radius of about 15″ (7 kpc). A two-dimensional map shows two high metallicity blob-like regions, which may be the gas expelled from the cD galaxy. |
| Keywords: | Chandra imaging spectroscopy Galaxy cluster AWM7 Astrophysics |
| 本文献已被 ScienceDirect 等数据库收录！ | |