A MULTIWAVELENGTH STUDY OF SUPERNOVA REMNANTS IN SIX NEARBY GALAXIES. I. DETECTION OF NEW X-RAY-SELECTED SUPERNOVA REMNANTS WITH CHANDRA
A MULTIWAVELENGTH STUDY OF SUPERNOVA REMNANTS IN SIX NEARBY GALAXIES. I. DETECTION OF NEW X-RAY-SELECTED SUPERNOVA REMNANTS WITH CHANDRA
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对附近六个星系中超新星遗迹的多波长研究。
DOI：
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发表时间：
2010
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通讯作者：
P. Boumis
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作者：
I. Leonidaki;A. Zezas;P. Boumis
我们基于钱德拉档案数据，展示了对六个附近星系（NGC 2403、NGC 3077、NGC 4214、NGC 4449、NGC 4395 和 NGC 5204）样本中的超新星遗迹 (SNR) 种群的研究结果。我们已经检测到 244 个离散 X 射线源，其极限通量可达 10−15 erg s−1 cm−2。我们根据 X 射线颜色或光谱识别了 37 个 X 射线选择的热 SNR，其中 30 个是新发现。在许多情况下，X 射线分类是根据在其他波长中识别出的 SNR 的对应物来确认的。我们首次研究了样本中的三个星系（NGC 4214、NGC 4395 和 NGC 5204），发现了 13 个热信噪比。我们讨论了样本星系中 X 射线检测到的 SNR 的属性（光度、温度和密度），以解决它们对其环境的依赖性。我们发现不规则星系中的 X 射线选择信噪比似乎比螺旋星系中的更亮。我们将此归因于金属丰度较低，因此不规则星系的祖星质量更大，或者星际介质的局部密度较高。我们还在其宿主星系的恒星形成率的背景下讨论了 X 射线选择的 SNR 群。将观测到的发光 X 射线选择的 SNR 数量与基于麦哲伦星云和 M33 中 X 射线 SNR 的光度函数预期的数量进行比较表明，螺旋星系和不规则星系的 SNR 之间存在不同的光度分布，后者往往具有更平坦的分布。
We present results from a study of the supernova remnant (SNR) population in a sample of six nearby galaxies (NGC 2403, NGC 3077, NGC 4214, NGC 4449, NGC 4395, and NGC 5204) based on Chandra archival data. We have detected 244 discrete X-ray sources down to a limiting flux of 10−15 erg s−1 cm−2. We identify 37 X-ray-selected thermal SNRs based on their X-ray colors or spectra, 30 of which are new discoveries. In many cases, the X-ray classification is confirmed based on counterparts with SNRs identified in other wavelengths. Three of the galaxies in our sample (NGC 4214, NGC 4395, and NGC 5204) are studied for the first time, resulting in the discovery of 13 thermal SNRs. We discuss the properties (luminosity, temperature, and density) of the X-ray-detected SNRs in the galaxies of our sample in order to address their dependence on their environment. We find that X-ray-selected SNRs in irregular galaxies appear to be more luminous than those in spirals. We attribute this to the lower metallicities and therefore more massive progenitor stars of irregular galaxies or the higher local densities of the interstellar medium. We also discuss the X-ray-selected SNR populations in the context of the star formation rate of their host galaxies. A comparison of the numbers of observed luminous X-ray-selected SNRs with those expected based on the luminosity functions of X-ray SNRs in the Magellanic Clouds and M33 suggest different luminosity distributions between the SNRs in spiral and irregular galaxies with the latter tending to have flatter distributions.