arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.04488astro-ph.HE
收藏

LIGO事件GW150914的费米-LAT观测

Fermi-LAT Observations of the LIGO event GW150914

LAT collaboration

摘要:

费米大天区望远镜(LAT)的瞬时视场覆盖天空的$\sim 1/5$,每3小时完成一次全天空的巡天。它提供了一个连续的,全天的高能量伽马射线调查,使搜索瞬态现象的时间尺度从毫秒到年。在这些现象中,电磁波可能是引力波源的对应物。在本文中,我们详细研究了与激光干涉引力波天文台(LIGO)事件GW 150904(Abbott等人,2016)相关的LAT观测结果,这是引力波的首次直接探测,并被解释为由于两个恒星质量黑洞的合并。在引力波信号发出时,GW 150904的定位区域在LAT视场之外。然而,作为常规调查观测的一部分,LAT在触发后约70分钟内观测到整个LIGO定位区域,从而能够全面搜索GW 150904的伽马射线对应物。这里提出的LAT数据的研究没有发现任何潜在的对应物GW 150904,但它确实提供了在整个GW 150904本地化区域的几小时到几天的时间尺度上存在100 MeV以上的瞬态对应物的限制。

英文摘要:

The Fermi Large Area Telescope (LAT) has an instantaneous field of view covering $\sim 1/5$ of the sky and completes a survey of the full sky every ~3 hours. It provides a continuous, all-sky survey of high-energy gamma-rays, enabling searches for transient phenomena over timescales from milliseconds to years. Among these phenomena could be electromagnetic counterparts to gravitational wave sources. In this paper, we present a detailed study of the LAT observations relevant to Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150904 (Abbott et al. 2016), which is the first direct detection of gravitational waves and has been interpreted as due to coalescence of two stellar-mass black holes. The localization region for GW150904 was outside the LAT field of view at the time of the gravitational wave signal. However, as part of routine survey observations, the LAT observed the entire LIGO localization region within ~70 minutes of the trigger, and thus enabled a comprehensive search for a gamma-ray counterpart to GW150904. The study of the LAT data presented here did not find any potential counterparts to GW150904, but it did provide limits on the presence of a transient counterpart above 100 MeV on timescales of hours to days over the entire GW150904 localization region.

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。

↑