Incoherent transient radio emission from stellar-mass compact objects in the SKA era
Incoherent transient radio emission from stellar-mass compact objects in the SKA era
复制标题
SKA时代恒星质量致密天体的非相干瞬态射电发射
DOI：
10.22323/1.215.0053
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
P. Woudt
中科院分区：
文献类型：
--
作者：
S. Corbel;J. Miller;R. Fender;E. Gallo;T. Maccarone;T. O’brien;Z. Paragi;M. Rupen;A. Rushton;S. Sabatini;G. Sivakoff;J. Strader;P. Woudt
吸积和抛射过程之间的普遍联系导致在吸积的致密物体周围形成喷流和流出。从这些流出的非相干S同步辐射可以从广泛的吸积双星观测到，包括黑洞、中子星和白矮星。监测射电辐射在其零星爆发期间的演变可以为喷流的发射提供重要的见解，当与较短波长的源的行为相结合时，可以探索与吸积过程的潜在联系。射电观测还可以探测喷流/外流(包括其他爆炸性事件，如磁星巨型耀斑)对周围介质的影响，量化它们的动力学反馈。SKA的高灵敏度将开辟新的参数空间，使人们能够监测吸积的恒星质量致密天体，从它们明亮的、爱丁顿有限的爆发状态一直到最低光度的静止水平，其内在的微弱到目前为止一直阻碍了详细的研究。对静止吸积的黑洞的普查也将限制双星进化过程。通过使我们能够将现有的对黑洞喷流的研究扩展到来自中子星和白矮星系统的较弱的喷流，SKA将允许进行比较研究，以确定致密天体在喷流形成中的作用。SKA的高灵敏度、宽视场和多光束能力将使我们能够探测和监测可观测的局部宇宙中的所有明亮耀斑瞬变(在∼15Mpc内)，包括超轻X射线源的射电对应物，提高我们对最高速率的吸积和喷流抛射的理解，对第一类星体的增长具有重要意义。由于同步加速器事件在更高的频率和更高的通量密度下更早达到峰值，这样的研究将最好由SKA1-MID实现，在更高的频带4和5。利用SKA1-MID的高灵敏度，我们也将能够从附近的环境探测正在经历Bondi-Hoyle吸积的孤立的静止黑洞，场中的恒星质量黑洞和球状星团中可能存在的中间黑洞。本章回顾了上面概述的科学目标，展示了SKA将在研究吸积致密天体的非相干同步辐射方面取得的进展。我们还讨论了如果一个重要的VLBI组件被包括在SKA的第一阶段(最终是第二阶段)中，可能进行的天体测量和成像观测的潜力。
The universal link between the processes of accretion and ejection leads to the formation of jets and outflows around accreting compact objects. Incoherent s ynchrotron emission from these outflows can be observed from a wide range of accreting binaries, including black holes, neutron stars, and white dwarfs. Monitoring the evolution of the radio emission during their sporadic outbursts provides important insights into the launching o f jets, and, when coupled with the behaviour of the source at shorter wavelengths, probes the underlying connection with the accretion process. Radio observations can also probe the impact of jets/outflows (including other explosive events such as magnetar giant flares) on the ambient medium, q uantifying their kinetic feedback. The high sensitivity of the SKA will open up new parameter space, enabling the monitoring of accreting stellar-mass compact objects from their bright, Eddington-limited outburst states down to the lowest-luminosity quiescent levels, whose intrinsic faintness has to date precluded detailed studies. A census of quiescently accreting black h oles will also constrain binary evolution processes. By enabling us to extend our existing investigations of black hole jets to the fainter jets from neutron star and white dwarf systems, the SKA will permit comparative studies to determine the role of the compact object in jet formation. The high sensitivity, wide field of view and multibeaming capability of the SKA will enable the detection and monitoring of all bright flaring transients in the observable local Universe (within ∼ 15 Mpc), including the radio counterparts of ultraluminous X-ray sources, improving our understanding of accretion and jet ejection at the highest rates, with important implications for the growth of the first quasars. As synchrotron events peak earlier at higher frequencies, and with higher flux densities, such studies will be best enabled by SKA1-MID, in the higher-frequency bands 4 and 5. With the high sensitivity available from SKA1-MID, we will also be able to probe isolated quiescent black holes undergoing Bondi-Hoyle accretion from the nearby environment, both stellar-mass black holes in the field and the putative population of intermediat e black holes in globular clusters. This chapter reviews the science goals outlined above, demonstrating the progress that will be made by the SKA in studying incoherent synchrotron emission from accreting compact objects. We also discuss the potential of the astrometric and imaging observations that would be possible should a significant VLBI component be included in phase 1 (and eventu ally phase 2) of the SKA.