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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Two power-law states of the ultraluminous X-ray source IC 342 X-1
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Two power-law states of the ultraluminous X-ray source IC 342 X-1

机译：超发光X射线源IC 342 X-1的两种幂律状态

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摘要

In order to elucidate the emission properties of ultraluminous X-ray sources (ULXs) during their power-law (PL) state, we examined long-term X-ray spectral data of IC 342 X-1 during its PL state by using our own Suzaku data and archival data by XMM-Newton, Chandra, and Swift observations. The PL state of this source seems to be classified into two sub-states in terms of the X-ray luminosities in the 0.5-10 keV band: the low-luminosity PL state with (4-6) × 10~(39) erg s~(-1) and the high-luminosity one with (1.1-1.4) × 10~(40) erg s~(-1). During Suzaku observations, which were made in 2010 August and 2011 March, X-1 stayed in the low-luminosity PL state. The observed X-ray luminosity (4.9-5.6 × 10~(39) erg s~(-1)) and the spectral shape (photon index = 1.67-1.83) slightly changed between the two observations. Using the Suzaku PIN detector, we for the first time confirmed a PL tail extending up to at least 20 keV with no signatures of a high-energy turnover in both of the Suzaku observations. In contrast, a turnover at about 6 keV was observed during the high-luminosity PL state in 2004 and 2005 with XMM-Newton. Importantly, the photon indices are similar between the two PL states, and so are the Compton y-parameters of y ～ 1, which indicates a similar energy balance (between the corona and the accretion disk) holding in the two PL states despite different electron temperatures. From spectral similarities with recent studies about other ULXs, and the Galactic black-hole binary GRS 1915+105, IC 342 X-1 is also likely to be in a state with a supercritical accretion rate, although more sensitive higher energy observations would be necessary to make any conclusion.
机译：为了阐明超发光X射线源（ULX）在其幂律（PL）状态期间的发射特性，我们使用自己的方法检查了IC 342 X-1在PL状态期间的长期X射线光谱数据XMM-Newton，Chandra和Swift观测的Suzaku数据和档案数据。根据0.5-10 keV波段的X射线发光度，该光源的PL状态似乎可以分为两个子状态：（4-6）×10〜（39）erg的低发光PL状态s〜（-1）和高发光度的（1.1-1.4）×10〜（40）erg s〜（-1）。在2010年8月和2011年3月进行的朱雀观测中，X-1处于低发光度PL状态。在两次观察之间，观察到的X射线光度（4.9-5.6×10〜（39）erg s〜（-1））和光谱形状（光子指数= 1.67-1.83）略有变化。我们使用朱雀PIN检测器首次确认了PL尾巴至少延伸到20 keV，在两个朱雀观测中都没有高能转换的迹象。相反，在2004年和2005年使用XMM-Newton的高发光PL状态下，观察到了大约6 keV的周转率。重要的是，两个PL态之间的光子指数相似，因此y〜1的康普顿y参数也是如此，这表明尽管电子不同，在两个PL态下保持相似的能量平衡（在电晕和吸积盘之间）温度。根据与其他ULX和银河黑洞二进制GRS 1915 + 105的最新研究的光谱相似性，IC 342 X-1也可能处于超临界吸积率的状态，尽管需要更敏感的高能观测得出任何结论。

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