The X-ray ribs within the cocoon shock of Cygnus A
The X-ray ribs within the cocoon shock of Cygnus A
复制标题
天鹅座 A 茧激波内的 X 射线肋骨
DOI:
10.1093/mnras/sty549
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发表时间:
2018
影响因子:
4.8
通讯作者:
Duffy R
中科院分区:
文献类型:
--
作者:
Duffy R
We use new and archivalChandraobservations of Cygnus A, totalling ∼1.9 Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like structure. We confirm that the X-rays are dominated by thermal emission with an average temperature of around 4 keV, and have discovered an asymmetry in the temperature gradient, with the southwestern part of the gas cooler than the rest by up to 2 keV. Pressure estimates suggest that the gas is a coherent structure of single origin located inside the cocoon, with a mass of roughly 2 × 1010M⊙. We conclude that the gas is debris resulting from disintegration of the cool core of the Cygnus A cluster after the passage of the jet during the early stages of the current epoch of activity. The 4 keV gas now lies on the central inside surface of the hotter cocoon rim. The temperature gradient could result from an offset between the centre of the cluster core and the Cygnus A host galaxy at the switch-on of current radio activity.
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影响因子:
6.5
作者:
J. Carlyle;A. Hillier
通讯作者:
J. Carlyle;A. Hillier
DOI:
10.1086/378513
发表时间:
2003
期刊:
The Astrophysical Journal
影响因子:
--
作者:
G. Canalizo;C. Max;D. Whysong;R. Antonucci;S. Dahm
通讯作者:
S. Dahm
DOI:
10.1086/504408
发表时间:
2006
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
T. Lazio;A. Cohen;N. Kassim;R. Perley;W. C. Erickson;C. Carilli;P. C. Crane
通讯作者:
P. C. Crane
DOI:
10.1086/310908
发表时间:
1997
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
F. Owen;M. Ledlow;G. Morrison;J. Hill
通讯作者:
J. Hill
DOI:
10.1086/520640
发表时间:
2007
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
作者:
R. Sutherland;G. Bicknell
通讯作者:
G. Bicknell