The Gaseous Atmosphere of M87 seen with XMM-Newton

The Gaseous Atmosphere of M87 seen with XMM-Newton
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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
Finoguenov
中科院分区:
--
文献类型:
--
作者:
Simionescu;Böhringer;Brüggen;Finoguenov

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AimsM 87是一个关键目标,它的研究可以揭示冷却堆芯的复杂现象。我们使用深XMM-牛顿观测M 87产生详细的温度,压力和熵的地图,以分析冷却核心的物理过程和他们的加热mechanism.MethodsWe采用宽带拟合和全光谱单温度模型分析,以获得温度和表面亮度地图,从其中的伪deprojected熵和压力进行了计算。我们讨论了可能的物理解释的小偏差,从径向和椭圆对称在这些maps.ResultsThe观察到的最突出的特点是E和SW的X射线臂,符合强大的射电瓣,在半径为3′,一个弱的冲击,在压力图和一个NW/SE不对称的熵图,我们与星系的运动向西北方向。我们第一次发现证据表明,冷的富含金属的气体也被向外输送到X射线臂之外,可能是通过气泡引起的混合。丰度图中的几个边缘表明星系沿着NW/SE方向振荡。此外,射电瓣似乎沿着椭圆形压力分布的短轴上升,遵循引力势的最陡梯度,并且似乎包含非热压力分量。
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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