AROUND 200 NEW X-RAY BINARY IDs FROM 13 YR OF CHANDRA OBSERVATIONS OF THE M31 CENTER
AROUND 200 NEW X-RAY BINARY IDs FROM 13 YR OF CHANDRA OBSERVATIONS OF THE M31 CENTER
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M31 中心钱德拉观测 13 年来的约 200 个新 X 射线双星 ID
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Murray
中科院分区：
文献类型：
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作者：
R. Barnard;Michael R. Garcia;F. Primini;Zhiyuan Li;F. Baganoff;S. Murray
我们已经为M31中心20′的528个X射线源创建了0.3-10 keV，13年的未吸收光度光变曲线。由于我们的瞬态监测计划，对M31核的更深入的观测，以及来自其他调查的一些公共数据，我们有174个钱德拉观测数据，间隔为2.1个月。我们创建了0.5-4.5千电子伏的结构函数（SFs）的每个源进行比较与活动星系核（AGN）的合奏SF。我们发现了220个X射线源，它们的亮度为1035 erg s−1，它们的SF比AGN SF的变化要大得多，它们很可能是X射线双星（XB）。另有30个X射线源用其他方法确定为超预算。因此，我们总共有250个可能的XBs，其中包括10200个新的身份。这一结果比之前在M31的D25区域内的2000个X射线源中识别出的2050个XB和2040个XB候选者有了很大的进步;它也证明了SF分析识别外部星系中XB的能力。我们还确定了一个新的瞬态黑洞候选者，与M31球状星团B128。
We have created 0.3–10 keV, 13 yr, unabsorbed luminosity lightcurves for 528 X-ray sources in the central 20′ of M31. We have 174 Chandra observations spaced at ∼1 month intervals due to our transient monitoring program, deeper observations of the M31 nucleus, and some public data from other surveys. We created 0.5–4.5 keV structure functions (SFs) for each source for comparison with the ensemble SF of active galactic nuclei (AGN). We find 220 X-ray sources with luminosities ≳1035 erg s−1 that have SFs with significantly more variability than the ensemble AGN SF, and which are likely X-ray binaries (XBs). A further 30 X-ray sources were identified as XBs using other methods. We therefore have 250 probable XBs in total, including ∼200 new identifications. This result represents great progress over the ∼50 XBs and ∼40 XB candidates previously identified out of the ∼2000 X-ray sources within the D25 region of M31; it also demonstrates the power of SF analysis for identifying XBs in external galaxies. We also identify a new transient black hole candidate, associated with the M31 globular cluster B128.