XMM-Newton survey of the Local Group galaxy M 33 – catalogue results and global properties
XMM-Newton survey of the Local Group galaxy M 33 – catalogue results and global properties
复制标题
本星系群 M 33 的 XMM-牛顿巡天 – 目录结果和全局属性
DOI：
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发表时间：
2004
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通讯作者：
G. Trinchieri
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作者：
W. Pietsch;Z. Misanovic;F. Haberl;D. Hatzidimitriou;M. Ehle;G. Trinchieri
利用对本星系群 M 33 的 24 个重叠的 XMM-Newton 观测，我们在每个单独的指向和深度组合图像中检测到了 447 个源。总共 61 个源在数小时到数月或数年的时间尺度上表现出高达 144 倍的显着通量变化。检测到的变异性与硬度比 (HR) 方法和光学识别（如果可用）一起用于将 M 33 中的源分类为 X 射线双星 (XRB)、超新星遗迹 (SNR) 和超软源 (SSS)，以及视场中的背景活动星系核和前景恒星。根据人力资源部门的说法，大多数来源只能归类为“困难”。我们发现M 33 中检测到的SNR 和SNR 候选者的光度分布与M 31 类似，并且比LMC 的稍微陡一些。
Using 24 overlapping XMM-Newton observations of the Local Group spiral galaxy M 33, we have detected 447 sources in each individual pointing and in deep combined images. A total of 61 sources exhibit significant flux variations by a factor of up to 144, on time scales of hours to months or years. The detected variability, together with the hardness ratio (HR) method and optical identification (when available), is used to classify the sources as X-ray binaries (XRBs), supernova remnants (SNRs) and super-soft sources (SSS) in M 33, as well as background AGN and foreground stars in the field of view. The majority of sources can only be classified as ‘hard’, according to their HRs. We find that the luminosity distribution of the detected SNRs and SNR candidates in M 33 is similar to M 31, and slightly steeper than that of the LMC.