arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1204.4832astro-ph.HE
收藏

黑洞候选者MAXIJ1659-152在X射线和射电中处于和趋向静止

The black hole candidate MAXIJ1659-152 in and towards quiescence in X-ray and radio

Peter G. Jonker, James C. A. Miller-Jones, J. Homan, J. Tomsick, R. P. Fender, P. Kaaret, S. Markoff, E. Gallo

摘要:

在本文中,我们报告了扩展甚大阵列无线电和钱德拉和斯威夫特X射线观测的瞬态黑洞候选人MAXI J1659-152在2011年的爆发衰变。我们讨论了考虑到高倾角时到源的距离,并得出结论,源的距离可能是6+-2kpc。观测到的最低通量对应于2 × 10^31(d/6 kpc)^2 erg/s的光度。这一点,加上文献中报道的轨道周期为2.4小时,表明静止X射线光度高于根据轨道周期-静止X射线光度关系所预测的光度。吸积和喷射机制之间的关系可以通过观测到的射电和X射线光度之间的相关性来研究。我们确定的行为MAXI J1659-152在无线电-X射线图在低X射线光度使用本文报道的观察和在高X射线光度使用文献中报道的值。在高X射线亮度下,源更靠近遵循比0.6-0.7陡峭的相关指数的源。然而,当与遵循更陡峭相关指数的其他源相比时,MAXI J1659-152中的X射线光度也较低。如果X射线发射来自源附近,而无线电发射起源于更广泛的区域,则后者可能由MAXI J1659-152的高倾角解释。然而,在这些射电观测期间,源可能并不处于典型的低硬态,这也可能影响源的行为。在中等X射线亮度下,源从射电欠发光源向“标准”相关性所追踪的关系方向过渡,类似于H1743-322所报告的情况。(节略)

英文摘要:

In this paper we report on Expanded Very Large Array radio and Chandra and Swift X-ray observations of the outburst decay of the transient black hole candidate MAXI J1659-152 in 2011. We discuss the distance to the source taking the high inclination into account and we conclude that the source distance is probably 6+-2 kpc. The lowest observed flux corresponds to a luminosity of 2x10^31 (d/6 kpc)^2 erg/s This, together with the orbital period of 2.4 hr reported in the literature, suggests that the quiescent X-ray luminosity is higher than predicted on the basis of the orbital period -- quiescent X-ray luminosity relationship. The relation between the accretion and ejection mechanisms can be studied using the observed correlation between the radio and X-ray luminosities as these evolve over an outburst. We determine the behaviour of MAXI J1659-152 in the radio -- X-ray diagram at low X-ray luminosities using the observations reported in this paper and at high X-ray luminosities using values reported in the literature. At high X-ray luminosities the source lies closer to the sources that follow a correlation index steeper than 0.6-0.7. However, when compared to other sources that follow a steeper correlation index, the X-ray luminosity in MAXI J1659-152 is also lower. The latter can potentially be explained by the high inclination of MAXI J1659-152 if the X-ray emission comes from close to the source and the radio emission is originating in a more extended region. However, it is probable that the source was not in the canonical low-hard state during these radio observations and this may affect the behaviour of the source as well. At intermediate X-ray luminosities the source makes the transition from the radio underluminous sources in the direction of the relation traced by the 'standard' correlation similar to what has been reported for H1743-322. (abridged)

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑