Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926
Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926
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星系团的重子含量和动态:A1095 和 A1926 的 XMM-Newton 观测
DOI:
10.1093/mnras/stw599
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发表时间:
2016-03
影响因子:
4.8
通讯作者:
Ji Li
中科院分区:
文献类型:
--
作者:
Tripp Todd;Li ZHiyuan;Gu Qiusheng;Ji Li
We have initiated a program to study the baryon content and dynamic state of galaxy clusters. Here we present results primarily from XMM-Newton observations of two optically selected galaxy clusters, A1095 (z similar or equal to 0.210) and A1926 (z similar or equal to 0.136). We find that both of them are actually cluster pairs at similar redshifts. We characterize the temperatures of these individual clusters through X-ray spectral fits and then estimate their gravitational masses. We show a rich set of substructures, including large position offsets between the diffuse X-ray centroids and the brightest galaxies of the clusters, which suggests that they are dynamically young. For both A1095 and A1926, we find that the mass required for the cluster pairs to be bound is smaller than the total gravitational mass. Thus both cluster pairs appear to be ongoing major mergers. Incorporating Sloan Digital Sky Survey and NRAO VLA Sky Survey/Faint Images of the Radio Sky at Twenty-cm data, we further examine the large-scale structure environment and radio emission of the clusters to probe their origins, which also leads to the discovery of two additional X-ray-emitting clusters (z similar or equal to 0.097 and similar or equal to 0.147) in the field of A1926. We estimate the hot gas and stellar masses of each cluster, which compared with the expected cosmological baryonic mass fraction, leave ample room for warm gas.
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影响因子:
3.3
作者:
M. Bonamente;N. Hasler;E. Bulbul;J. Carlstrom;T. Culverhouse;M. Gralla;C. Greer;D. Hawkins;R. Hennessy;M. Joy;J. Kolodziejczak;J. Lamb;D. Landry;E. Leitch;D. Marrone;Amber D. Miller;T. Mroczkowski;S. Muchovej;T. Plagge;C. Pryke;M. Sharp;D. Woody
通讯作者:
M. Bonamente;N. Hasler;E. Bulbul;J. Carlstrom;T. Culverhouse;M. Gralla;C. Greer;D. Hawkins;R. Hennessy;M. Joy;J. Kolodziejczak;J. Lamb;D. Landry;E. Leitch;D. Marrone;Amber D. Miller;T. Mroczkowski;S. Muchovej;T. Plagge;C. Pryke;M. Sharp;D. Woody
DOI:
10.1086/306949
发表时间:
1998-06
期刊:
The Astrophysical Journal
影响因子:
--
作者:
R. Cen;J. Ostriker
通讯作者:
R. Cen;J. Ostriker
DOI:
10.1111/j.1365-2966.2010.18033.x
发表时间:
2010-08
影响因子:
4.8
作者:
I. McCarthy;J. Schaye;R. Bower;T. Ponman;C. Booth;C. D. Vecchia;V. Springel
通讯作者:
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DOI:
10.1086/506505
发表时间:
2005-12
期刊:
The Astrophysical Journal
影响因子:
--
作者:
R. Cen;J. Ostriker
通讯作者:
R. Cen;J. Ostriker
影响因子:
4.8
作者:
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通讯作者:
W. Cui;C. Power;V. Biffi;S. Borgani;A. Knebe;G. Murante;D. Fabjan;G. Lewis;G. Poole