Combined Spectral and Timing Analysis of the Black Hole Candidate MAXI J1659−152, Discovered by MAXI and Swift
Combined Spectral and Timing Analysis of the Black Hole Candidate MAXI J1659−152, Discovered by MAXI and Swift
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DOI：
10.1093/pasj/64.2.32
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发表时间：
2011-10
影响因子：
2.3
通讯作者：
K. Yamaoka;R. Allured;P. Kaaret;J. Kennea;T. Kawaguchi;P. Gandhi;Nicholai Shaposhnikov;Y. Ueda
中科院分区：
文献类型：
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作者：
K. Yamaoka;R. Allured;P. Kaaret;J. Kennea;T. Kawaguchi;P. Gandhi;Nicholai Shaposhnikov;Y. Ueda
我们报告的X射线光谱和计时结果的新的黑洞候选人（BHC）MAXI J1659-152的轨道周期为2.41小时（BHC中最短的）在2010年爆发65罗西X射线定时探测器（RXTE）的观测和8个同时斯威夫特和RXTE观测。根据Remillard & McClintock（2006）对光谱态的定义，大多数观测都被归为中间态。所有的X射线宽带谱都可以用多色圆盘加指数截止的幂律函数或多色圆盘加康普顿化分量来模拟。在爆发的初始阶段，在30-40 keV处可见高能截止。从爆发开始，盘的最内侧半径逐渐减小，减小了3倍以上，并达到35 d（sub 10）cos（i sup 1/2）km的恒定值，其中d（sub 10）是以10 kpc为单位的距离，i是倾角。C类准周期振荡（QPO）频率随最内半径的变化而变化，变化范围为1.6 ~ 7.3Hz，而B类QPO的最内半径在1.6- 4.1Hz范围内保持不变。因此，我们认为B型QPO的起源不同于C型QPO，后者可能起源于盘截断半径。假设在爆发后期最内侧的稳定圆形轨道是最内侧的半径，则MAXI J1659-152的黑洞质量估计为3.6-8.0太阳质量，距离为5.3-8.6 kpc，倾角为60-75度。
We report on X-ray spectral and timing results of the new black hole candidate (BHC) MAXI J1659-152 with the orbital period of 2.41 hours (shortest among BHCs) in the 2010 outburst from 65 Rossi X-ray Timing Explorer (RXTE) observations and 8 simultaneous Swift and RXTE observations. According to the definitions of the spectral states in Remillard & McClintock (2006), most of the observations have been classified into the intermediate state. All the X-ray broadband spectra can be modeled by a multi-color disk plus a power-law with an exponential cutoff or a multi-color disk plus a Comptonization component. During the initial phase of the outburst, a high energy cutoff was visible at 30-40 keV. The innermost radius of the disk gradually decreased by a factor of more than 3 from the onset of the outburst and reached a constant value of 35 d(sub 10)cos(i sup 1/2) km, where d(sub 10) is the distance in units of 10 kpc and i is the inclination. The type-C quasi-periodic oscillation (QPO) frequency varied from 1.6 Hz to 7.3 Hz in association with a change of the innermost radius, while the innermost radius remained constant during the type-B QPO detections at 1.6-4.1 Hz. Hence, we suggest that the origin of the type-B QPOs is different from that of type-C QPOs, the latter of which would originate from the disk truncation radius. Assuming the constant innermost radius in the latter phase of the outburst as the innermost stable circular orbit, the black hole mass in MAXI J1659-152 is estimated to be 3.6-8.0 solar mass for a distance of 5.3-8.6 kpc and an inclination angle of 60-75 degrees.