The Discovery Outburst of the X-Ray Transient IGR J17497–2821 Observed with RXTE and ATCA
The Discovery Outburst of the X-Ray Transient IGR J17497–2821 Observed with RXTE and ATCA
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DOI：
10.1086/511819
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
Jérôme Rodriguez;M. C. Bel;J. Tomsick;S. Corbel;C. Brocksopp;A. Paizis;S. E. Shaw;A. Bodaghee
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文献类型：
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作者：
Jérôme Rodriguez;M. C. Bel;J. Tomsick;S. Corbel;C. Brocksopp;A. Paizis;S. E. Shaw;A. Bodaghee
本文报道了最近发现的X射线瞬变IGR J17497-2821的一系列RXTE和ATCA观测结果。我们的3-200 keV PCA+HEXTE光谱分析表明，在爆发最大值附近的10天内变化很小。IGR J17497-2821是在X射线双星（XRB）的典型低硬态（LHS）中发现的，由吸收的康普顿化光谱很好地表示，铁边约为7 keV。吸收的高值（~4 × 1022 cm-2）表明源位于一个很大的距离，要么靠近银河系中心，要么超过银河系中心。时序分析没有显示出特殊的特征，而功率密度谱的形状也是XRB的LHS的典型特征，具有约36%的均方根变化。在4.80和8.64 GHz处，没有发现低至0.21 mJy的无线电对应物。虽然IGR J17497-2821在射电到X射线通量图中的位置远低于通常在黑洞的LHS中观察到的相关性，但将其X射线性质与其他来源的X射线性质进行比较使我们认为它是一个黑洞候选者。
We report the results of a series of RXTE and ATCA observations of the recently discovered X-ray transient IGR J17497-2821. Our 3-200 keV PCA+HEXTE spectral analysis shows very little variations over a period of ~10 days around the maximum of the outburst. IGR J17497-2821 is found in a typical low-hard state (LHS) of X-ray binaries (XRBs), well represented by an absorbed Comptonized spectrum with an iron edge at about 7 keV. The high value of the absorption (~4 × 1022 cm-2) suggests that the source is located at a large distance, either close to the Galactic center or beyond. The timing analysis shows no particular features, while the shape of the power density spectra is also typical of the LHS of XRBs, with ~36% rms variability. No radio counterpart is found down to a limit of 0.21 mJy at 4.80 and 8.64 GHz. Although the position of IGR J17497-2821 in the radio to X-ray flux diagram is well below the correlation usually observed in the LHS of black holes, the comparison of its X-ray properties with those of other sources leads us to suggest that it is a black hole candidate.