软X射线背景的XMM-牛顿巡天。III。星系晕的X射线发射
An XMM-Newton Survey of the Soft X-ray Background. III. The Galactic Halo X-ray Emission
摘要：
我们目前的测量星系晕的X射线发射110 XMM牛顿视线，选择以尽量减少污染的太阳风电荷交换排放。我们在大约4/5的视线范围内探测到几百万度气体的辐射。温度相当均匀（中位数= 2.22e6K，四分位距= 0.63e6K），而发射测量值和固有的0.5- 2.0keV表面亮度变化超过一个数量级（分别为~（0.4-7）e-3 cm^-6 pc和~（0.5-7）e-12 erg cm^-2 s^-1 deg^-2，检测中值分别为1.9 e-3 cm^-6 pc和1.5 e-12 erg cm^-2 s^-1 deg^-2）。高纬度的天空中有一个零星分布的几百万度的气体。这种气体在南银河半球的银河系内部的排放量普遍增加。然而，有没有趋势，我们所观察到的排放措施，以减少银河系纬度的增加，相反，预期的盘状晕形态。测量的温度，亮度和气体的空间分布可以用来限制模型的主要热源的光环。我们提供了一些讨论这样的热源，但推迟到以后的论文的观察和详细的模式之间的比较。
英文摘要：
We present measurements of the Galactic halo's X-ray emission for 110 XMM-Newton sight lines, selected to minimize contamination from solar wind charge exchange emission. We detect emission from few million degree gas on ~4/5 of our sight lines. The temperature is fairly uniform (median = 2.22e6 K, interquartile range = 0.63e6 K), while the emission measure and intrinsic 0.5--2.0 keV surface brightness vary by over an order of magnitude (~(0.4-7)e-3 cm^-6 pc and ~(0.5-7)e-12 erg cm^-2 s^-1 deg^-2, respectively, with median detections of 1.9e-3 cm^-6 pc and 1.5e-12 erg cm^-2 s^-1 deg^-2, respectively). The high-latitude sky contains a patchy distribution of few million degree gas. This gas exhibits a general increase in emission measure toward the inner Galaxy in the southern Galactic hemisphere. However, there is no tendency for our observed emission measures to decrease with increasing Galactic latitude, contrary to what is expected for a disk-like halo morphology. The measured temperatures, brightnesses, and spatial distributions of the gas can be used to place constraints on models for the dominant heating sources of the halo. We provide some discussion of such heating sources, but defer comparisons between the observations and detailed models to a later paper.
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