arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2406.04409astro-ph.GAastro-ph.HEgr-qc
收藏

识别脉冲星计时阵列发现的超大质量黑洞双星的宿主星系

Identifying Host Galaxies of Supermassive Black Hole Binaries Found by PTAs

Polina Petrov, Stephen R. Taylor, Maria Charisi, Chung-Pei Ma

AI总结:

本文提出宿主星系识别流程,通过模拟PTA数据恢复单源引力波信号并量化定位区域与候选星系数量,评估不同条件下筛选后的宿主候选数目及其影响因素。

摘要:

超大质量黑洞双星(SMBHBs)为多信使科学带来了令人振奋的机遇。这类系统被认为是在星系并合中自然形成的,因此既可能产生电磁(EM)辐射,也可能产生可由脉冲星计时阵列(PTAs)探测到的引力波(GWs)。一旦从单个可分辨的SMBHB中探测到引力波,宿主星系的识别将成为一个重大挑战,原因在于可能的电磁特征存在模糊性,且PTAs的定位能力较差。为了帮助电磁观测选择需要后续跟踪的源,我们尝试在现实和理想化两种情形下量化可能宿主星系的数量。我们描述了一个宿主星系识别流程:向模拟的PTA数据集中注入单源引力波信号,使用生产级技术恢复信号,量化定位区域及其所包含的星系数量,最后利用引力波搜索估计出的双星参数对星系施加筛选。在理想情形下,我们发现90%置信区域面积为29平方度到241平方度,包含约14到341个星系。经过筛选后,剩余星系数量在最差情况下为22个,在最好情况下为1个(即真实宿主)。在更现实的情形下,如果信号被充分定位,天区面积范围为287平方度到530平方度,包含约285到1238个星系。经过筛选后,星系数量在最差情况下为397个,在最好情况下为27个。虽然信噪比是决定给定源定位区域面积的主要因素,但我们发现该面积大小还受到天空中邻近脉冲星的接近程度以及源的啁啾质量的影响。

英文摘要:

Supermassive black hole binaries (SMBHBs) present us with exciting opportunities for multi-messenger science. These systems are thought to form naturally in galaxy mergers and therefore have the potential to produce electromagnetic (EM) radiation as well as gravitational waves (GWs) detectable with pulsar timing arrays (PTAs). Once GWs from individually resolved SMBHBs are detected, the identification of the host galaxy will be a major challenge due to the ambiguity in possible EM signatures and the poor localization capability of PTAs. In order to aid EM observations in choosing which sources to follow up, we attempt to quantify the number of plausible hosts in both realistic and idealistic scenarios. We outline a host galaxy identification pipeline that injects a single-source GW signal into a simulated PTA dataset, uses production-level techniques to recover the signal, quantifies the localization region and number of galaxies contained therein, and finally imposes cuts on the galaxies using the binary parameters estimated from the GW search. In an ideal case, we find that the 90% credible areas span 29 deg^2 to 241 deg^2, containing about 14 to 341 galaxies. After cuts, the number of galaxies remaining ranges from 22 at worst to 1 (the true host) at best. In a more realistic case, if the signal is sufficiently localized, the sky areas range from 287 deg^2 to 530 deg^2 and enclose about 285 to 1238 galaxies. After cuts, the number of galaxies is 397 at worst and 27 at best. While the signal-to-noise ratio is the primary determinant of the localization area of a given source, we find that the size of the area is also influenced by the proximity of nearby pulsars on the sky and the chirp mass of the source.

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。

↑