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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku observation of two ultraluminous X-ray sources in NGC 1313
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Suzaku observation of two ultraluminous X-ray sources in NGC 1313

机译：朱雀在NGC 1313中观察到两个超发光X射线源

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Two ultraluminous X-ray sources (ULXs) in the nearby Sb galaxy NGC 1313, named X-1 and X-2, were observed with Suzaku on 2005 September 15. During the observation for a net exposure of 28 ks (but over a gross time span of 90 ks), both objects varied in intensity by about 50%. The 0.4-10 keV X-ray luminosities of X-1 and X-2 were measured as 2.5 x 10(40) erg s(-1) and 5.8 x 10(39) erg s(-1), respectively, with the former exhibiting the highest ever reported for this ULX. The spectrum of X-1 can be explained by the sum of a strong and variable powerlaw component with a high-energy cutoff, and a stable multicolor blackbody with an innermost disk temperature of similar to 0.2 keV. These results suggest that X-1 was in a "very high" state, where disk emission is strongly Comptonized. The absorber within NGC 1313 toward X-1 is suggested to have a subsolar oxygen abundance. The spectrum of X-2 is best represented, in its fainter phase, by a multicolor blackbody model with an innermost disk temperature of 1.2-1.3 keV, and becomes flatter as the source becomes brighter. Hence, X-2 is interpreted to be in a slim-disk state. These results suggest that the two ULXs have black hole masses of some dozens to a few hundred of solar masses.
机译：2005年9月15日，朱雀观测到附近的Sb星系NGC 1313中的两个超发光X射线源（ULX），分别名为X-1和X-2。在观测期间，净暴露为28 ks（但超过时间跨度为90 ks），两个物体的强度变化约50％。 X-1和X-2的0.4-10 keV X射线光度分别为2.5 x 10（40）erg s（-1）和5.8 x 10（39）erg s（-1）。前者展示了该ULX的最高报道。 X-1的光谱可通过具有高能量截止的强和可变幂律分量与最内层盘温度类似于0.2 keV的稳定多色黑体的总和来解释。这些结果表明，X-1处于“非常高”状态，其中磁盘发射被强烈补偿。建议NGC 1313中朝向X-1的吸收器具有次太阳能氧丰度。 X-2的光谱在其较暗的阶段最好用多色黑体模型表示，该模型的最内部圆盘温度为1.2-1.3 keV，并且随着光源变亮而变得更平坦。因此，X-2被解释为处于薄盘状态。这些结果表明，两个ULX的黑洞质量约为几十到几百个太阳质量。

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