论文标题
Maxi J1631-479在2019年1月爆发期间的演变由Integral/Ibis观察到
Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS
论文作者
论文摘要
我们在2019年1月观察到的新的X射线二元瞬态Maxi J1631-479中报告了最近的明亮爆发。特别是，我们在其Galactic平面监测程序中对使用积分/IBIS观察到的光谱过渡进行了30-200 KEV分析。在超长和蝙蝠监测期间，我们观察到高/软/低/硬状态之间的两个不同的光谱过渡。从第二个过渡前不久获取的数据的整体频谱最好由一个组成的热量成分，其电子温度为30 keV，高光度值在2-200 keV能量范围内为3x10^38 erg/s（假设距离为8 kpc）。在第二个过渡期间，源显示了硬幂的频谱。缺乏高能量截止，表明Maxi J1631-479的硬X射线光谱是由于非热发射引起的。来自非热或混合热/非热电子分布的软X射线光子的逆综合散射可以解释观察到的X射线光谱，尽管在此阶段无法确定对射流的硬X射线发射的贡献。硬度强度图，光谱特征以及爆发的上升和衰减时间的爆发演变表明，该系统是黑洞候选者。
We report on a recent bright outburst from the new X-ray binary transient MAXI J1631-479, observed in January 2019. In particular, we present the 30-200 keV analysis of spectral transitions observed with INTEGRAL/IBIS during its Galactic Plane monitoring program. In the MAXI and BAT monitoring period, we observed two different spectral transitions between the high/soft and low/hard states. The INTEGRAL spectrum from data taken soon before the second transition, is best described by a Comptonised thermal component with an electron temperature of 30 keV and a high luminosity value of 3x10^38 erg/s in 2-200 keV energy range (assuming a distance of 8 kpc). During the second transition, the source shows a hard, power-law spectrum. The lack of high energy cut-off indicates that the hard X-ray spectrum from MAXI J1631-479 is due to a non-thermal emission. Inverse Compton scattering of soft X-ray photons from a non-thermal or hybrid thermal/non-thermal electron distribution can explain the observed X-ray spectrum although a contribution to the hard X-ray emission from a jet cannot be determined at this stage. The outburst evolution in the hardness-intensity diagram, the spectral characteristics and the rise and decay times of the outburst are suggesting this system is a black hole candidate.
