arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.01099astro-ph.HEastro-ph.COastro-ph.IM
收藏

毫秒角尺度上的重复快速射电暴FRB 121102

The Repeating Fast Radio Burst FRB 121102 as Seen on Milliarcsecond Angular Scales

B. Marcote, Z. Paragi, J. W. T. Hessels, A. Keimpema, H. J. van Langevelde, Y. Huang, C. G. Bassa, S. Bogdanov, G. C. Bower, S. Burke-Spolaor, B. J. Butler, R. … 展开作者

B. Marcote, Z. Paragi, J. W. T. Hessels, A. Keimpema, H. J. van Langevelde, Y. Huang, C. G. Bassa, S. Bogdanov, G. C. Bower, S. Burke-Spolaor, B. J. Butler, R. M. Campbell, S. Chatterjee, J. M. Cordes, P. Demorest, M. A. Garrett, T. Ghosh, V. M. Kaspi, C. J. Law, T. J. W. Lazio, M. A. McLaughlin, S. M. Ransom, C. J. Salter, P. Scholz, A. Seymour, A. Siemion, L. G. Spitler, S. P. Tendulkar, R. S. Wharton

摘要:

毫秒级的射电闪光被称为快速射电暴(FRB),是一种神秘的天体物理现象。最近,使用VLA对FRB 121102进行的亚角秒定位(~ 100 mas精度)使其与持久射电和光学对应物有明确的关联,并确定了其宿主星系。然而,需要更精确的定位,以探测毫秒爆发本身和相关的持续发射之间的直接物理关系。在这里,我们报告甚长基线射电干涉观测使用欧洲VLBI网络和305米阿雷西博望远镜,同时检测爆发和持续的无线电发射在毫角秒的角尺度,并表明,他们是共同定位到一个投影的线性间隔<40 pc(<12 mas角间距,在95%的置信度)。我们探测到一致的爆发角展宽和持续的射电源(~ 2- 4 mas在1.7GHz),这两者都类似于预期的银河系散射的贡献。持久射电源的投影尺寸限制在< 0.7pc(5.0GHz时< 0.2mas角范围),亮温下限T_b > 5 × 10^7K。总之,这些观测结果为FRB 121102和紧凑持久射电源之间的直接物理联系提供了强有力的证据。我们认为,与低光度的活动星系核或年轻的中子星激发超新星遗迹的爆发源是FRB 121102的两个方案,最符合观测数据。

英文摘要:

The millisecond-duration radio flashes known as Fast Radio Bursts (FRBs) represent an enigmatic astrophysical phenomenon. Recently, the sub-arcsecond localization (~ 100mas precision) of FRB121102 using the VLA has led to its unambiguous association with persistent radio and optical counterparts, and to the identification of its host galaxy. However, an even more precise localization is needed in order to probe the direct physical relationship between the millisecond bursts themselves and the associated persistent emission. Here we report very-long-baseline radio interferometric observations using the European VLBI Network and the 305-m Arecibo telescope, which simultaneously detect both the bursts and the persistent radio emission at milliarcsecond angular scales and show that they are co-located to within a projected linear separation of < 40pc (< 12mas angular separation, at 95% confidence). We detect consistent angular broadening of the bursts and persistent radio source (~ 2-4mas at 1.7GHz), which are both similar to the expected Milky Way scattering contribution. The persistent radio source has a projected size constrained to be < 0.7pc (< 0.2mas angular extent at 5.0GHz) and a lower limit for the brightness temperature of T_b > 5 x 10^7K. Together, these observations provide strong evidence for a direct physical link between FRB121102 and the compact persistent radio source. We argue that a burst source associated with a low-luminosity active galactic nucleus or a young neutron star energizing a supernova remnant are the two scenarios for FRB121102 that best match the observed data.

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。

↑