新的过渡脉冲星候选者CXOU J110926的延长亚发光状态。4 - 650224
Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4-650224
摘要：
本文报道了对未分类X射线源CX110926.4 - 650224（J1109）的多波长研究。我们确定了光学对应物是一颗蓝色恒星，星等为$\sim$ 20.1（3300 - 10500 $\require{mediawiki-texvc} Å$）。光发射在数百秒到数千秒的时间尺度上是可变的。光谱显示出突出的发射线，在不同的时期具有可变的配置文件。同时进行的XMM-Newton和NuSTAR观测揭示了X射线计数率在短至数十秒的时间尺度上的双峰分布，以及零星的耀斑活动。平均宽带（0.3 - 79 keV）光谱由吸收幂律模型充分描述，光子指数为$Γ$ = 1.63 $\pm$ 0.01（在1 $σ$ c.l.），X射线光度为（2.16 $\pm$ 0.04）$\times$ 10 $^{34}$ erg s $^{-1}$。根据不同仪器的观测，X射线光度在过去$\sim$ 15年中保持相对稳定。J1109在空间上与伽马射线源FL8 Y J1109.8 - 6500相关，后者是费米在2008年至2016年期间在0.1 - 300 GeV能带上以平均光度（1.5 $\pm$ 0.2）$\times$ 10 $^{34}$ erg s $^{-1}$（假设距离为J1109）探测到的。在与NuSTAR同时进行的ATCA无线电观测期间，该源未被检测到，低至3 $σ$通量上限18 $μ$ Jy/波束（在7.25 GHz）。我们表明，J1109点的现象学性质的二元过渡脉冲星候选人目前在一个亚发光吸积盘状态，和无线电发射的上限推导出的预期射电光度吸积中子星在类似的X射线光度是一致的。
英文摘要：
We report on a multi-wavelength study of the unclassified X-ray source CXOU J110926.4-650224 (J1109). We identified the optical counterpart as a blue star with a magnitude of $\sim$20.1 (3300-10500 $\require{mediawiki-texvc} Å$). The optical emission was variable on timescales from hundreds to thousands of seconds. The spectrum showed prominent emission lines with variable profiles at different epochs. Simultaneous XMM-Newton and NuSTAR observations revealed a bimodal distribution of the X-ray count rates on timescales as short as tens of seconds, as well as sporadic flaring activity. The average broad-band (0.3-79 keV) spectrum was adequately described by an absorbed power law model with photon index of $Γ$=1.63$\pm$0.01 (at 1$σ$ c.l.), and the X-ray luminosity was (2.16$\pm$0.04)$\times$10$^{34}$ erg s$^{-1}$ for a distance of 4 kpc. Based on observations with different instruments, the X-ray luminosity has remained relatively steady over the past $\sim$15 years. J1109 is spatially associated with the gamma-ray source FL8Y J1109.8-6500, which was detected with Fermi at an average luminosity of (1.5$\pm$0.2)$\times$10$^{34}$ erg s$^{-1}$ (assuming the distance of J1109) over the 0.1-300 GeV energy band between 2008 and 2016. The source was undetected during ATCA radio observations that were simultaneous with NuSTAR, down to a 3$σ$ flux upper limit of 18 $μ$Jy/beam (at 7.25 GHz). We show that the phenomenological properties of J1109 point to a binary transitional pulsar candidate currently in a sub-luminous accretion disk state, and that the upper limits derived for the radio emission are consistent with the expected radio luminosity for accreting neutron stars at similar X-ray luminosities.
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