Supernova remnants in M33: X-ray properties as observed by XMM–Newton

Supernova remnants in M33: X-ray properties as observed by XMM–Newton
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M33 中的超新星遗迹:XMM-Newton 观察到的 X 射线特性

DOI:
10.1093/mnras/stx1905
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发表时间:
2017
影响因子:
4.8
通讯作者:
Winkler, P. Frank
Winkler, P. Frank
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Garofali, Kristen;Williams, Benjamin F.;Plucinsky, Paul P.;Gaetz, Terrance J.;Wold, Brian;Haberl, Frank;Long, Knox S.;Blair, William P.;Pannuti, Thomas G.;Winkler, P. Frank

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我们利用XMM-Newton对M33中超新星遗迹(SNR)群的X射线特性进行了研究,包括对M33中覆盖D25等值线内所有区域的8个视场的深度观测,典型光度为7.1×1034erg s−1(0.2–2.0 keV)。在这里,我们报告了我们对 M33 中先前识别的 SNR 的 X 射线特性进行表征的工作,以及我们对新的 X 射线检测到的 SNR 的搜索。凭借我们的深度观测和大视场,我们在3σ水平上检测到了105个信噪比,其中54个是X射线中新检测到的信噪比,另外3个是新发现的信噪比。将 XMM-Newtondata 与 deepChandrasurvey 数据相结合,可以对 15 个 SNR 进行详细的光谱拟合,我们测量了这些 SNR 的温度、电离时间尺度和个体丰度。这个大的 SNR 样本使我们能够构建 X 射线光度函数,并将其形状与不同金属丰度和恒星形成率的宿主星系的光度函数进行比较,以寻找环境对 SNR 特性的影响。我们的结论是,虽然金属丰度可能在 SNR 群体特征中发挥作用,但短时间尺度上不同的恒星形成历史和小规模的环境影响似乎会导致 X 射线光度分布之间存在更显着的差异。此外,我们分析了SNR的X射线可检测性,发现在M33中,[Sii]/H α比率较高的SNR以及具有较小星系中心距离的SNR在X射线中更容易被检测到。
We have carried out a study of the X-ray properties of the supernova remnant (SNR) population in M33 withXMM–Newton, comprising deep observations of eight fields in M33 covering all of the area within the D25contours, and with a typical luminosity of 7.1 × 1034erg s−1(0.2–2.0 keV). Here, we report our work to characterize the X-ray properties of the previously identified SNRs in M33, as well as our search for new X-ray detected SNRs. With our deep observations and large field of view we have detected 105 SNRs at the 3σ level, of which 54 SNRs are newly detected in X-rays, and three are newly discovered SNRs. CombiningXMM–Newtondata with deepChandrasurvey data allows detailed spectral fitting of 15 SNRs, for which we have measured temperatures, ionization time-scales and individual abundances. This large sample of SNRs allows us to construct an X-ray luminosity function, and compare its shape to luminosity functions from host galaxies of differing metallicities and star formation rates to look for environmental effects on SNR properties. We conclude that while metallicity may play a role in SNR population characteristics, differing star formation histories on short time-scales, and small-scale environmental effects appear to cause more significant differences between X-ray luminosity distributions. In addition, we analyse the X-ray detectability of SNRs, and find that in M33 SNRs with higher [Sii]/H α ratios, as well as those with smaller galactocentric distances, are more detectable in X-rays.
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