A possible shock wave in the intergalactic medium of the cluster of galaxies A754 |
| |
| Authors: | R A Krivonos A A Vikhlinin M L Markevitch M N Pavlinsky |
| |
| Institution: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia;(2) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA |
| |
| Abstract: | The cluster of galaxies A754 is undergoing a merger of several large structural units. X-ray observations show the nonequilibrium state of the central part of the cluster, in which a cloud of cold plasma ～500 kpc in size was identified amid the hotter cluster gas. The X-ray image of A754 exhibits a brightness discontinuity, which can be interpreted as a shock wave in front of a moving cloud of dense gas. The shock parameters are determined from the jump in intergalactic gas density using the ROSAT image. The estimated Mach number is M1 = 1.71 ?0.24 +0.45 at a 68% confidence level. |
| |
| Keywords: | clusters of galaxies shock waves |
| 本文献已被 SpringerLink 等数据库收录！ |
|
