论文标题
黑洞X射线二进制EXO 1846-031的无线电观察结果从34年的沉睡中重新唤醒
Radio observations of the Black Hole X-ray Binary EXO 1846-031 re-awakening from a 34-year slumber
论文作者
论文摘要
我们向广播[1.3 GHz Meerkat，4-8 GHz Karl G. Jansky非常大（VLA）和15.5 GHz Arcminute Microkelvin Imager大阵列（AMI-LA）]和X射线（Swift and Maxi）（Swift and Maxi）（来自2019年候选黑洞X-RAY BAINY BAINY BAINIL（BHXB）的数据。我们计算一个硬度强度图，该图显示了爆发中BHXB的特征性Q形滞后。 EXO 1846-031每周与Meerkat一起监视，每天与Ami-La进行大约每天的监测。 VLA观测值在爆发的关键点提供了亚弧形分辨率图像，显示了移动的无线电组件。无线电和X射线光曲线广泛地互相跟随，显示了〜MJD 58702上的峰值，随后在〜MJD 58731-58739之间的第二个峰值下降了。我们估计这些无线电耀斑的最小能量，从套票中计算$ e _ {\ rm min} \ sim $ 4 $ \ times $ 10 $^{41} $和5 $ \ times $ 10 $^{42 {42} $ erg的值。 The exact date of the return to `quiescence' is missed in the X-ray and radio observations, but we suggest that it likely occurred between MJD 58887 and 58905. From the Swift X-ray flux on MJD 58905 and assuming the soft-to-hard transition happened at 0.3-3 per cent Eddington, we calculate a distance range of 2.4-7.5\,kpc.我们在“硬”状态下计算了EXO 1846-031的无线电：X射线平面，这表明它很可能是一个``radio-quiet''BH，优先在4.5 kpc处。使用此距离和$θ$ = 73 $^{\ circ} $的喷气倾斜角度，VLA数据放置在$β_ {\ rm int} = 0.29c $的固有喷气速度上的限制，表明下延伸射流运动。
We present radio [1.3 GHz MeerKAT, 4-8 GHz Karl G. Jansky Very Large Array (VLA) and 15.5 GHz Arcminute Microkelvin Imager Large Array (AMI-LA)] and X-ray (Swift and MAXI) data from the 2019 outburst of the candidate Black Hole X-ray Binary (BHXB) EXO 1846-031. We compute a Hardness-Intensity diagram, which shows the characteristic q-shaped hysteresis of BHXBs in outburst. EXO 1846-031 was monitored weekly with MeerKAT and approximately daily with AMI-LA. The VLA observations provide sub-arcsecond-resolution images at key points in the outburst, showing moving radio components. The radio and X-ray light curves broadly follow each other, showing a peak on ~MJD 58702, followed by a short decline before a second peak between ~MJD 58731-58739. We estimate the minimum energy of these radio flares from equipartition, calculating values of $E_{\rm min} \sim$ 4$\times$10$^{41}$ and 5$\times$10$^{42}$ erg, respectively. The exact date of the return to `quiescence' is missed in the X-ray and radio observations, but we suggest that it likely occurred between MJD 58887 and 58905. From the Swift X-ray flux on MJD 58905 and assuming the soft-to-hard transition happened at 0.3-3 per cent Eddington, we calculate a distance range of 2.4-7.5\,kpc. We computed the radio:X-ray plane for EXO 1846-031 in the `hard' state, showing that it is most likely a `radio-quiet' BH, preferentially at 4.5 kpc. Using this distance and a jet inclination angle of $θ$=73$^{\circ}$, the VLA data place limits on the intrinsic jet speed of $β_{\rm int} = 0.29c$, indicating sub-luminal jet motion.
