Chandra observations of the nucleus of M33
Chandra observations of the nucleus of M33
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DOI：
10.1046/j.1365-8711.2002.05827.x
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发表时间：
2002-07
影响因子：
4.8
通讯作者：
G. Dubus;R. Rutledge
中科院分区：
文献类型：
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作者：
G. Dubus;R. Rutledge
附近的星系M33拥有本星系群中最明亮的稳定X射线源。钱德拉的高空间分辨率使我们能够确认这个超亮X射线源位于核内，并在4.6σ水平上排除了先前提出的位于1角秒之外的可能对应物。X射线谱与一个圆盘黑体很好地拟合，kTin = 1.18 ± 0.02 keV，Rin（cos θ）0.5 = 57 ± 3 km，与ASCA和BeppoSAX的早期结果一致。源通量在1到10 4 s之间是稳定的（<3% rms变异性，0.5 - 10 keV），0.5 - 10 keV的光度为1.5 × 10 39 erg s −1。它的X射线特性和与射电源的关联让人想起银河系微类星体GRS 1915+105。
The nearby galaxy M33 hosts the most luminous steady X-ray source in the Local Group. The high spatial resolution of Chandra allows us to confirm that this ultra-luminous X-ray source is within the nucleus and rule out at the 4.6σ level a previously proposed possible counterpart located 1 arcsec away. The X-ray spectrum is well fitted by a disc blackbody with kTin = 1.18 ± 0.02 keV and Rin(cos θ ) 0.5 = 57 ± 3 km, consistent with earlier results from ASCA and BeppoSAX. The source flux is steady between 1 and 10 4 s( <3 per cent rms variability, 0.5‐10 keV) with a 0.5‐10 keV luminosity of 1.5 × 10 39 erg s −1 . The X-ray properties and an association with a radio source are reminiscent of the galactic microquasar GRS 1915+105.