ABUNDANCE GRADIENTS IN COOLING FLOW CLUSTERS - GINGA LARGE-AREA COUNTERS AND EINSTEIN SOLID-STATE SPECTROMETER SPECTRA OF A496, A1795, A2142, AND A2199

被引:40
作者
WHITE, RE
DAY, CSR
HATSUKADE, I
HUGHES, JP
机构
[1] MIYAZAKI UNIV,DEPT ELECTR ENGN,MIYAZAKI 88921,JAPAN
[2] NASA,GODDARD SPACE FLIGHT CTR,GSFC,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771
[3] HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138
关键词
COOLING FLOWS; GALAXIES; ABUNDANCES; CLUSTERS OF; X-RAYS;
D O I
10.1086/174669
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyze the Ginga LAC and Einstein SSS spectra of four cooling flow clusters, A496, A1795, A2142, and A2199, each of which shows firm evidence of a relatively cool component. The inclusion of such cool spectral components in joint fits of SSS and LAC data leads to somewhat higher global temperatures than are derived from the high-energy LAC data alone. We find little evidence of cool emission outside the SSS field of view. Metal abundances appear to be centrally enhanced in all four clusters, with varying degrees of model dependence and statistical significance: the evidence is statistically strongest for A496 and A2142, somewhat weaker for A2199 and weakest for A1795. We also explore the model dependence in the amount of cold, X-ray absorbing matter discovered in these clusters by White et al.
引用
收藏
页码:583 / 601
页数:19
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