The Gaseous Atmosphere of M87 seen with XMM-Newton
The Gaseous Atmosphere of M87 seen with XMM-Newton
复制标题
用 XMM-Newton 观测到的 M87 的气体气氛
DOI:
10.1051/0004-6361:20066650
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Finoguenov
中科院分区:
文献类型:
--
作者:
Simionescu;Böhringer;Brüggen;Finoguenov
AimsM 87 is a key object whose study can reveal the complex phenomena in cooling cores. We use a deep XMM-Newton observation of M 87 to produce detailed temperature, pressure and entropy maps in order to analyze the physical processes of cooling cores and of their heating mechanisms.MethodsWe employed both broad-band fitting and full spectroscopical one-temperature model analysis to derive temperature and surface brightness maps, from which the pseudo-deprojected entropy and pressure were calculated. We discuss possible physical interpretations of small deviations from radial and elliptical symmetry in these maps.ResultsThe most prominent features observed are the E and SW X-ray arms that coincide with powerful radio lobes, a weak shock at a radius of 3′, an overall ellipticity in the pressure map and a NW/SE asymmetry in the entropy map which we associate with the motion of the galaxy towards the NW. For the first time we find evidence that cold, metal-rich gas is being transported outwards also outside the X-ray arms, possibly through bubble-induced mixing. Several edges in the abundance map indicate an oscillation of the galaxy along the NW/SE direction. Furthermore, the radio lobes appear to rise along the short axis of the elliptical pressure distribution, following the steepest gradient of the gravitational potential, and seem to contain a nonthermal pressure component.
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DOI:
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发表时间:
1989
期刊:
影响因子:
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作者:
B. McNamara;R. O’Connell
通讯作者:
R. O’Connell
DOI:
10.1086/425952
发表时间:
2004
期刊:
The Astrophysical Journal
影响因子:
--
作者:
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DOI:
10.1086/429746
发表时间:
2003-12
期刊:
The Astrophysical Journal
影响因子:
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通讯作者:
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DOI:
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发表时间:
2002
期刊:
影响因子:
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作者:
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通讯作者:
M. Arnaud
DOI:
10.1111/j.1745-3933.2006.00243.x
发表时间:
2006-06
影响因子:
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作者:
S. Heinz;S. Heinz;M. Brüggen;A. Young;Emily M. Levesque
通讯作者:
S. Heinz;S. Heinz;M. Brüggen;A. Young;Emily M. Levesque