标题： 基于Swift观测爆发确认AX J1841.0-0536的超巨型快速X射线暂现源特性 显示英文标题

标题： Confirmation of the Supergiant Fast X-ray Transient nature of AX J1841.0-0536 from Swift outburst observations

摘要： Swift于2010年6月5日观测到来自超级巨星快速X射线暂现源（SFXT）AX J1841.0-0536的一次爆发，并用XRT对其进行了为期11天的后续观测。X射线光变曲线显示了一个初始耀发后衰减并随后增强的现象，这在其他SFXT中也经常看到，并且具有约1600的动力学范围。 我们的观测使我们能够首次分析该源从0.3 keV到100 keV的同步宽带谱，它可以很好地拟合通常用于描述高能X射线双星中吸积中子星辐射的模型，并表现出高吸收（N_H~2×10^22 cm^-2）、平坦幂律（Gamma~0.2）和高能截止等特性。所有这些性质都类似于这一类别的原型IGR J17544-2619，后者在2010年3月4日发生爆发，我们同样讨论了对该源的观测。 我们展示了AX J1841.0-0536如何很好地符合SFXT类别，基于其在2010年爆发期间的观测性质、X射线亮度的大动力学范围、光变曲线（长度和形状）与Swift观测到的其他SFXT的相似性以及X射线宽带谱性质。 显示英文摘要

摘要： Swift observed an outburst from the supergiant fast X-ray transients (SFXT) AX J1841.0-0536 on 2010 June 5, and followed it with XRT for 11 days. The X-ray light curve shows an initial flare followed by a decay and subsequent increase, as often seen in other SFXTs, and a dynamical range of ~1600. Our observations allow us to analyse the simultaneous broad-band (0.3-100 keV) spectrum of this source, for the first time down to 0.3 keV, can be fitted well with models usually adopted to describe the emission from accreting neutron stars in high-mass X-ray binaries, and is characterized by a high absorption (N_H~2x10^22 cm-2), a flat power law (Gamma~0.2), and a high energy cutoff. All of these properties resemble those of the prototype of the class, IGR J17544-2619, which underwent an outburst on 2010 March 4, whose observations we also discuss. We show how well AX J1841.0-0536 fits in the SFXT class, based on its observed properties during the 2010 outburst, its large dynamical range in X-ray luminosity, the similarity of the light curve (length and shape) to those of the other SFXTs observed by Swift, and the X-ray broad-band spectral properties.