ASCA observations of the temperature structure and metal distribution in the Perseus cluster of galaxies

Citation
H. Ezawa et al., ASCA observations of the temperature structure and metal distribution in the Perseus cluster of galaxies, PUB AST S J, 53(4), 2001, pp. 595-604
Citations number
50
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN journal
0004-6264 → ACNP
Volume
53
Issue
4
Year of publication
2001
Pages
595 - 604
Database
ISI
SICI code
0004-6264(2001)53:4<595:AOOTTS>2.0.ZU;2-B
Abstract
Large-scale distributions of hot-gas temperature and Fe abundance in the Pe rseus cluster have been studied with multi-pointing observations by the GIS instrument onboard ASCA. Within a radius of 20 ' from the cluster center, the energy spectra requires two temperature components. in which the cool c omponent indicates kT similar to 2 keV and the hot-component temperature sh ows a significant decline from about 8 keV to 6 keV toward the center. In t he outer region of the cluster, the temperature shows a fluctuation with an amplitude of about 2 keV. which suggest that a western region at similar t o 16 ' from the cluster center is relatively hotter. As for the Fe abundanc e, a significant decline with radius is detected from 0.44 solar at the cen ter to similar to 0.1 solar at a 50 ' offset region. If the observed Fe-K l ine intensity within 4 ' from the center is suppressed by a factor of 2 due to the resonance scattering effect, the corrected Fe mass density follows the galaxy distribution. Finally, our results do not support the large-scal e velocity gradients previously reported from the same GIS data.