arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1002.1082astro-ph.HE
收藏

证实非电磁宇宙瞬变的广角X射线天空监测

Wide Angle X-ray Sky Monitoring for Corroborating non-Electromagnetic Cosmic Transients

Dafne Guetta, David Eichler

摘要:

聚并中子星(NS)和黑洞-中子星(BH-NS)双星可以发射引力波(GW),它们被认为是短硬伽马射线暴(SHB)的源。伽马射线火球似乎被射成一个小的立体角,因此只有一小部分可检测到的GW事件预计将与SHB观测一致。类似地,如果γ射线发射的锥比中微子窄,那么与伽马射线暴(GRB)相关的高能中微子信号也无法通过瞬发γ射线发射得到证实。因此,更需要其他方法来证实来自合并中的中子星的非电磁信号。在此应注意,SHB的延伸X射线尾部(XRT)类似于X射线闪光(XRF),并且两者都可以归因于离轴视线,因此跨越比硬发射更大的立体角。有人提出,较高比例的可检测GW事件可能与XRF/XRT相一致,而不是硬伽马射线,从而提高了检测它作为GW或中微子源的可能性。散射的伽马射线,可能对着一个更大的立体角的主要伽马射线喷流,也是候选人的确证非电磁信号。

英文摘要:

Gravitational waves (GW) can be emitted from coalescing neutron star (NS) and black hole-neutron star (BH-NS) binaries, which are thought to be the sources of short hard gamma ray bursts (SHBs). The gamma ray fireballs seem to be beamed into a small solid angle and therefore only a fraction of detectable GW events is expected to be observationally coincident with SHBs. Similarly ultrahigh energy (UHE) neutrino signals associated with gamma ray bursts (GRBs) could fail to be corroborated by prompt gamma-ray emission if the latter is beamed in a narrower cone than the neutrinos. Alternative ways to corroborate non-electromagnetic signals from coalescing neutron stars are therefore all the more desirable. It is noted here that the extended X-ray tails (XRT) of SHBs are similar to X-ray flashes (XRFs), and that both can be attributed to an off-axis line of sight and thus span a larger solid angle than the hard emission. It is proposed that a higher fraction of detectable GW events may be coincident with XRF/XRT than with hard gamma-rays, thereby enhancing the possibility to detect it as a GW or neutrino source. Scattered gamma-rays, which may subtend a much larger solid angle that the primary gamma ray jet, are also candidates for corroborating non-electromagnetic signals.

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。

↑