M31中一个超亮恒星质量微类星体的明亮射电发射
高能天体物理现象
2015-06-12 v1
摘要
一部分超亮X射线源（光度<10^40 erg/s）被认为是由气体吸积到质量约为5-20 M_solar的黑洞上驱动的，可能通过吸积盘。在银河系源中，X射线和射电发射是耦合的，射电发射起源于相对论性喷流，被认为是从黑洞附近的最内部区域发射的，最强大的发射发生在下落物质速率接近理论最大值（爱丁顿极限）时。在银河系中只已知四个这样的最大源，并且星际介质对软X射线的吸收阻碍了确定导致喷流抛射的因果序列。这里我们报告了对邻近星系M31中一个明亮新X射线源的射电和X射线观测，其峰值光度可超过10^39 erg/s。射电光度极高，并在数十分钟的时间尺度上表现出变化，表明该源高度致密，并由接近爱丁顿极限的吸积驱动到一个恒星质量黑洞上。对此类源的持续射电和X射线监测应能揭示吸积流与强大喷流发射之间的因果关系。
引用
@article{arxiv.1212.4698,
title = {Bright radio emission from an ultraluminous stellar-mass microquasar in M31},
author = {Matthew J. Middleton and James C. A. Miller-Jones and Sera Markoff and Rob Fender and Martin Henze and Natasha Hurley-Walker and Anna M. M. Scaife and Timothy P. Roberts and Dominic Walton and John Carpenter and Jean-Pierre Macquart and Geoffrey C. Bower and Mark Gurwell and Wolfgang Pietsch and Frank Haberl and Jonathan Harris and Michael Daniel and Junayd Miah and Chris Done and John Morgan and Hugh Dickinson and Phil Charles and Vadim Burwitz and Massimo Della Valle and Michael Freyberg and Jochen Greiner and Margarita Hernanz and Dieter H. Hartmann and Despina Hatzidimitriou and Arno Riffeser and Gloria Sala and Stella Seitz and Pablo Reig and Arne Rau and Marina Orio and David Titterington and Keith Grainge},
journal= {arXiv preprint arXiv:1212.4698},
year = {2015}
}
备注
23 pages, 4 figures accepted by Nature (AOP 12/12/12)