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arXiv 0910.2799astro-ph.HE
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根据INTEGRAL、RXTE和Swift观测的X射线双星J19294 +1816的性质

The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations

J. Rodriguez, J. A. Tomsick, A. Bodaghee, J. -A. Zurita Heras, S. Chaty, A. Paizis, S. Corbel

摘要:

我们报告了最近发现的INTEGRAL源IGR J19294+1816的高能多仪器活动的结果。Swift/XRT数据使我们能够将源的位置精确到RA= 19 h 29 m 55.9 s Dec=+18 deg 18' 38.4”(+- 3.5”),这反过来又使我们能够识别候选的红外对应物。Swift和RXTE光谱与硬(γ ~ 1)光子指数的吸收幂律很好地拟合。在最长的雨燕观测期间,我们获得了吸收真正超过银河值的证据,这可能表明这个来源中有一些内在的吸收。我们在12.43781(+-0.00003)s处探测到一个强(P=40%)脉动,我们将其解释为脉冲星的自旋周期。所有这些结果,加上可能的117天轨道周期,都表明IGR J19294+1816是一颗有Be伴星的HMXB。然而,虽然长期的INTEGRAL/IBIS/ISGRI 18- 40千电子伏的光变曲线显示,源花费其大部分时间在一个不可检测的状态,我们检测到的短(~2000-3000秒)和强烈的耀斑,更典型的超巨星快速X射线瞬变发生。因此,我们不能对系统的类型做出确切的结论,我们讨论了IGR J19294+1816作为SFXT的可能影响。

英文摘要:

We report the results of a high-energy multi-instrumental campaign with INTEGRAL, RXTE, and Swift of the recently discovered INTEGRAL source IGR J19294+1816. The Swift/XRT data allow us to refine the position of the source to RA= 19h 29m 55.9s Dec=+18deg 18' 38.4" (+- 3.5"), which in turn permits us to identify a candidate infrared counterpart. The Swift and RXTE spectra are well fitted with absorbed power laws with hard (Gamma ~ 1) photon indices. During the longest Swift observation, we obtained evidence of absorption in true excess to the Galactic value, which may indicate some intrinsic absorption in this source. We detected a strong (P=40%) pulsation at 12.43781 (+-0.00003) s that we interpret as the spin period of a pulsar. All these results, coupled with the possible 117 day orbital period, point to IGR J19294+1816 being an HMXB with a Be companion star. However, while the long-term INTEGRAL/IBIS/ISGRI 18--40 keV light curve shows that the source spends most of its time in an undetectable state, we detect occurrences of short (~2000-3000 s) and intense flares that are more typical of supergiant fast X-ray transients. We therefore cannot make firm conclusions on the type of system, and we discuss the possible implications of IGR J19294+1816 being an SFXT.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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