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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku Observations of Unidentified X-Ray Sources toward the Galactic Bulge
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Suzaku Observations of Unidentified X-Ray Sources toward the Galactic Bulge

机译：朱雀对未识别的X射线源向银河凸起的观察

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We present Suzaku observations of two unidentified sources towards the Galactic bulge, 1RXSJ165256.3-264503 and 1RXS J174459.5-172640, both of which were discovered with the ROSAT " All-Sky Survey. We obtained wide-band spectra of these sources above 2 keV for the first time. The X-ray spectrum of 1RXS J165256.3—264503 consists of two absorbed thin thermal plasma components with temperatures of 0.7 and 2.4 keV. An RSCVn star, HD 152178, was found within a 90% error circle of the source position. Due to this position coincidence, and an X-ray spectrum analogous to those of other RS CVn binaries, we concluded that 1RXS J165256.3-264503 is an RSCVn-type active binary. The X-ray spectrum of 1RXS J174459.5-172640 was dominated by continuum emission extending up to ~ 20 keV, which can be explained by an absorbed cutoff power-law or a combination of absorbed multicolor disk-blackbody and Comptonized emission. We inferred that the source is a new Galactic-bulge low-mass X-ray binary (LMXB) with a luminosity of 2 x 1035 erg s-1, based on its X-ray spectrum and lightcurve. Hence, 1RXS J174459.5—172640 may be an intriguing example of an LMXB in an intermediate state in which X-ray emission mechanisms can be readily explored.
机译：我们展示了朱雀对银河凸起的两个未知来源的观测结果，即1RXSJ165256.3-264503和1RXS J174459.5-172640，它们都是通过ROSAT“全天候测量”发现的。我们在上方获得了这些光源的宽带光谱首次达到2 keV。1RXS J165256.3—264503的X射线光谱由两个吸收的薄热等离子体组成，温度分别为0.7和2.4 keV，在90％的误差范围内发现了一个RSCVn星HD 152178。由于该位置重合以及与其他RS CVn二进制文件类似的X射线光谱，我们得出结论：1RXS J165256.3-264503是RSCVn型有源二进制文件。1RXS的X射线光谱J174459.5-172640的主要特征是连续发射高达20 keV，这可以用吸收的截止幂律或吸收的多色圆盘黑体和Comptonized发射的组合来解释，我们推断该源是一个新的银河系凸起的低质量X射线二进制（LMXB）机智基于其X射线光谱和光曲线，其光度为2 x 1035 erg s-1。因此，1RXS J174459.5-172640可能是处于中间状态的LMXB的一个有趣示例，在该状态下可以轻松探索X射线发射机制。

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