揭示IGR J17419-2802的短而暗的X射线瞬变特性

V. Sguera, L. Sidoli
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引用次数: 0

摘要

我们报告了 INTErnational Gamma-Ray AstrophysicsLaboratory(INTEGRAL)、Swift、Chandra 和 XMM-Newton 对迄今为止研究较少的不明 X 射线瞬态 IGR J17419-2802 进行观测的新 X 射线结果。Westudied in detail the temporal, spectral, and energetic properties of threehard X-ray outbursts detected above 20 keV by INTEGRAL.它们的平均 X 射线光度为 3$\times$10$^{35}$~erg~s$^{-1}$,持续时间为几天。这标志着IGR J17419-2802的X射线瞬变性质非常短暂和微弱。从未公开的软 X 射线观测档案中,我们发现该源大部分时间都是在非常低的 X 射线通量下(爆发时低至 2000 美元)被探测到的。我们提供了一个精确的弧秒大小的源误差圈。在这个误差圈内,我们确定了一个最佳候选近红外对应天体,它的光度特性与晚期类型的光谱性质相符。基于我们的新发现,我们认为IGR J17419-2802是极暗X射线瞬变(VFXTs)类的新成员。对 20 keV 以上的 VFXT 爆发的详细研究尤其罕见。在这方面,我们所报告的INTEGRAL爆发是迄今为止研究得最好的;特别是,其持续时间被限制在几天之内,是迄今为止测量到的最短的VFXT之一。
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Unveiling the short and faint X-ray transient nature of IGR J17419-2802
We report new X-ray results from the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), Swift, Chandra, and XMM-Newton observations of the hitherto poorly studied unidentified X-ray transient IGR J17419-2802. We studied in detail the temporal, spectral, and energetic properties of three hard X-ray outbursts detected above 20 keV by INTEGRAL. They are all characterized by an average X-ray luminosity of 3$\times$10$^{35}$~erg~s$^{-1}$ and a constrained duration of a few days. This marks a peculiarly short and faint X-ray transient nature for IGR J17419-2802. From archival unpublished soft X-ray observations, we found that the source spends most of the time undetected at very low X-ray fluxes (down to $<4.7\times10^{-14}$ erg cm $^{-2}$ s$^{-1}$) for a dynamic range >2,000 when in outburst. We provided an accurate arcsecond-sized source error circle. Inside it, we pinpointed the best candidate near-infrared counterpart whose photometric properties are compatible with a late-type spectral nature. Based on our new findings, we suggest that IGR J17419-2802 is a new member of the very faint X-ray transients (VFXTs) class. Detailed investigations of VFXT outbursts above 20 keV are particularly rare. In this respect, our reported INTEGRAL outbursts are among the best studied to date; in particular, their constrained duration of a few days is among the shortest ever measured for a VFXT.
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