arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.04522astro-ph.HE
收藏

引力波探测的双黑洞合并电磁对应的极限

Limits on electromagnetic counterparts of gravitational wave-detected binary black hole mergers

Rosalba Perna, Davide Lazzati, Will Farr

摘要:

与包含中子星(NS)的两个致密天体合并不同,双黑洞(BBH)合并并不伴随着潮汐分裂物质的产生,因此缺乏最直接的吸积源来驱动喷流和产生电磁辐射。然而,在费米GBM探测到对应于GW 150914的$γ$射线后,人们提出了几种替代方案来驱动喷流并产生EM辐射。{ \em}如果这种喷流真的产生了,那么它们将缺乏明亮的茧状发射,而这种发射使得来自双星NS的喷流在大视角下也是明亮的。在这里,通过蒙特卡罗模拟人口的BBH合并与从现有的LIGO/室女座观测推断的属性一致,和角发射特性的喷流传播到星际介质,我们得到的限制,允许的能量和洛伦兹因子的这种喷流从EM后续行动GW检测到BBH合并事件的日期,我们做出预测,这将有助于收紧这些限制与宽带EM后续行动的事件,在未来的LIGO/处女座运行。10个GW探测到的BBH合并中的$\lesssim 1$事件高于费米/GBM阈值的条件要求任何当前允许的发射模型必须满足条件$E_{\rm iso}/(10^{49} {\rm erg})(θ_{jet}/20^\circ)\lesssim 1$。

英文摘要:

Unlike mergers of two compact objects containing a neutron star (NS), binary black hole (BBH) mergers are not accompanied by the production of tidally disrupted material, and hence lack the most direct source of accretion to power a jet and generate electromagnetic (EM) radiation. However, following a tentative detection by the Fermi GBM of a $γ$-ray counterpart to GW150914, several alternative ideas were proposed for driving a jet and producing EM radiation. {\em If} such jets were in fact produced, they would however lack the bright cocoon emission that makes jets from binary NSs bright also at large viewing angles. Here, via Monte Carlo simulations of a population of BBH mergers with properties consistent with those inferred from the existing LIGO/Virgo observations, and the angular emission characteristic of jets propagating into the interstellar medium, we derive limits on the allowed energetics and Lorentz factors of such jets from EM follow ups to GW-detected BBH merger events to date, and we make predictions which will help tighten these limits with broadband EM follow ups to events in future LIGO/Virgo runs. The condition that $\lesssim 1$ event out of 10 GW-detected BBH mergers be above the Fermi/GBM threshold imposes that any currently allowed emission model has to satisfy the condition $E_{\rm iso}/(10^{49} {\rm erg})(θ_{jet}/20^\circ)\lesssim 1$.

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。

↑