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首页> 外文OA文献 >A multi-wavelength study of Supernova Remnants in six nearby galaxies. I: Detection of new X-ray selected Supernova Remnants with Chandra
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A multi-wavelength study of Supernova Remnants in six nearby galaxies. I: Detection of new X-ray selected Supernova Remnants with Chandra

机译：对附近六个星系中超新星遗迹的多波长研究。   I：用钱德拉检测新的X射线选择的超新星遗迹

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We present results from a study of the Supernova Remnant (SNR) population ina sample of six nearby galaxies (NGC 2403, NGC 3077, NGC 4214, NGC 4449, NGC4395 and NGC 5204) based on Chandra archival data. We have detected 244discrete X-ray sources down to a limiting flux of 10^{-15} erg/s. We identify37 X-ray selected thermal SNRs based on their X-ray colors or spectra, 30 ofwhich are new discoveries. In many cases the X-ray classification is confirmedbased on counterparts with SNRs identified in other wavelengths. Three of thegalaxies in our sample (NGC 4214, NGC 4395 and NGC 5204) are studied for thefirst time, resulting in the discovery of 13 thermal SNRs. We discuss theproperties (luminosity, temperature, density) of the X-ray detected SNRs in thegalaxies of our sample in order to address their dependence on theirenvironment. We find that X-ray selected SNRs in irregular galaxies appear tobe more luminous than those in spirals. We attribute this to the lowermetalicities and therefore more massive progenitor stars of irregular galaxiesor the higher local densities of the ISM. We also discuss the X-ray selectedSNR populations in the context of the Star Formation Rate of their hostgalaxies. A comparison of the numbers of observed luminous X-ray selected SNRswith those expected based on the luminosity functions of X-ray SNRs in the MCsand M33 suggest different luminosity distributions between the SNRs in spiraland irregular galaxies with the latter tending to have flatter distributions.
机译：我们基于Chandra档案数据，对六个附近星系（NGC 2403，NGC 3077，NGC 4214，NGC 4449，NGC4395和NGC 5204）的样本中的超新星残留（SNR）种群进行了研究，给出了研究结果。我们已经检测到244个离散X射线源，其极限通量为10 ^ {-15} erg / s。我们基于X射线选择的热SNR来识别37个X射线的颜色或光谱，其中30个是新发现。在许多情况下，会根据在其他波长中识别出的SNR来确定X射线分类。首次研究了样本中的三个星系（NGC 4214，NGC 4395和NGC 5204），从而发现了13个热SNR。我们讨论了样本星系中X射线检测到的SNR的特性（光度，温度，密度），以解决它们对环境的依赖性。我们发现，不规则星系中的X射线选择SNR似乎比旋涡中的SNR更发光。我们将其归因于较低的金属性，因此归因于不规则星系的更大的祖先恒星或ISM的较高局部密度。我们还讨论了在其宿主星系的恒星形成率的背景下选择X射线的SNR总体。将观测到的发光X射线SNR数与基于MC和M33中X射线SNR的光度函数所预期的SNR数进行比较，表明螺旋星系和不规则星系中SNR的光度分布不同，后者的分布倾向于趋于平坦。

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