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首页> 外文期刊>The Astrophysical journal >DIFFUSE X-RAYS FROM THE INNER 3 PARSECS OF THE GALAXY
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DIFFUSE X-RAYS FROM THE INNER 3 PARSECS OF THE GALAXY

机译:来自银河系内部3个区域的X射线漫射

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Recent observations with the Chandra X-Ray Observatory have provided us with the capability to discriminate point sources, such as the supermassive black hole Sgr A~*, from the diffuse emission within the inner 10″ of the Galaxy. The hot plasma producing the diffuse X-radiation, estimated at ≈7.6 x 10~(31) ergs s~(-1) arcsec~(-2) in the 2-10 keV band, has an rms electron density ≈26 cm~(-3) and a temperature kT ≈1.3 keV, with a total inferred mass of ≈0.1 solar mass. At least some of this gas must be injected into the interstellar medium via stellar winds. In the most recent census, about 25 bright, young stars have been identified as the dominant sources of the overall mass efflux from the Galactic center. In this paper we use detailed three-dimensional smoothed particle hydrodynamics (SPH) simulations to study the wind-wind interactions occurring in the inner 3 pc of the Galaxy, with a goal of understanding what fraction, if any, of the diffuse X-ray flux measured by Chandra results from the ensuing shock heating of the ambient medium. We conclude that this process alone can account for the entire X-ray flux observed by Chandra in the inner 10″ of the Galaxy. Understanding the X-ray morphology of the environment surrounding Sgr A~* will ultimately provide us with a greater precision in modeling the accretion of gas onto this object, which appears to be relatively underluminous compared to its brethren in the nuclei of other galaxies.
机译:钱德拉X射线天文台最近的观测为我们提供了将点源(例如超大质量黑洞Sgr A〜*)与银河系内部10''内的散射发射区分开的能力。产生散射X辐射的热等离子体在2-10 keV波段中估计为≈7.6x 10〜(31)ergs s〜(-1)arcsec〜(-2),均方根电子密度约为26 cm〜 (-3)和温度kT≈1.3 keV,总推断质量为≈0.1太阳质量。这些气体中至少有一些必须通过恒星风注入星际介质中。在最近的人口普查中,已确认约有25颗明亮的年轻恒星是银河系中心整体质量外排的主要来源。在本文中,我们使用详细的三维平滑粒子流体动力学(SPH)模拟来研究在银河内部3 pc中发生的风-风相互作用,目的是了解弥散X射线的比例(如果有)钱德拉(Chandra)测量的磁通量是由随后环境介质的激热引起的。我们得出的结论是,仅此过程就可以解决钱德拉在银河内部10英寸观察到的整个X射线通量。理解Sgr A〜*周围环境的X射线形态最终将为我们提供一个更高的精度,以模拟气体在该物体上的吸积,与其他星系原子中的同胞相比,该气体的发光程度相对较低。

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