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 1503.06218astro-ph.HE
收藏

致密双星并合的射电耀斑:非平凡流出几何的影响

Radio Flares of Compact Binary Mergers: the Effect of Non-Trivial Outflow Geometry

Ben Margalit, Tsvi Piran

摘要:

下一代引力波探测器对致密双星(中子星/黑洞)合并产生的引力波最为敏感。如果其中一个是中子星,合并也会通过三种可能的渠道发射电磁辐射:伽马射线暴及其(可能是孤儿)余辉(Eichler et al. 1989),Li-Paczynski Macronovae(Li & Paczynski 1998)和射电耀斑(Nakar & Piran 2011)。这种伴随的电磁辐射在确认GW探测中至关重要(Kochanek & Piran 1993)。它还可以揭示有关合并的丰富信息,并将为多信使天文学打开一扇窗户。因此,确定和描述这些对应方至关重要。在这项工作中,我们探讨晚时间无线电耀斑发射的动态喷出的外流。我们建立在以前的工作,并考虑流出的非平凡的几何形状的影响。利用近似方法,我们估计了在数值模拟中得到的几个喷射物质分布的射电光变曲线。我们的方法提供了一个上限的非球形的效果。与球面估计一起,得到的光变曲线约束实际信号。我们发现,虽然非球形的几何形状可以在原则上导致增强的发射,在大多数情况下,它们会导致增加的时间尺度相比,相应的球形配置。这将在一定程度上削弱这些信号,并可能降低检测前景。

英文摘要:

The next generation gravitational waves (GW) detectors are most sensitive to GW emitted by compact (neutron star/black hole) binary mergers. If one of those is a neutron star the merger will also emit electromagnetic radiation via three possible channels: Gamma-ray bursts and their (possibly orphan) afterglows (Eichler et al. 1989), Li-Paczynski Macronovae (Li & Paczynski 1998) and radio flares (Nakar & Piran 2011). This accompanying electromagnetic radiation is vitally important in confirming the GW detections (Kochanek & Piran 1993). It could also reveal a wealth of information regarding the merger and will open a window towards multi-messenger astronomy. Identifying and characterizing these counterparts is therefore of utmost importance. In this work we explore late time radio flares emitted by the dynamically ejected outflows. We build upon previous work and consider the effect of the outflow's non-trivial geometry. Using an approximate method we estimate the radio light-curves for several ejected matter distributions obtained in numerical simulations. Our method provides an upper limit to the effect of non-sphericity. Together with the spherical estimates the resulting light curves bound the actual signal. We find that while non-spherical geometries can in principle lead to an enhanced emission, in most cases they result in an increase in the timescale compared with a corresponding spherical configuration. This would weaken somewhat these signals and might decrease the detection prospects.

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。

↑