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arXiv 1807.02853astro-ph.HEastro-ph.CO
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演化宇宙中中子星合并的位置和环境

The Location and Environments of Neutron Star Mergers in an Evolving Universe

Brandon K. Wiggins, Christopher L. Fryer, Joseph M. Smidt, Dieter H. Hartmann, Nicole Lloyd-Ronning, Chris Belcynski

摘要:

同时探测到来自中子星合并的引力波和电磁波,既巩固了中子星合并和短持续时间伽马射线暴(GRB)之间的联系,也证明了天文学家有能力跟踪引力波探测,以限制这些合并的喷出物以及GRB发动机及其周围环境的性质。随着aLIGO和VIRGO的灵敏度增加,在未来几年内可能会出现越来越多的此类检测,从而导致大量事件来限制这些GRB事件的数量。虽然长持续时间的伽马射线暴起源于大质量恒星,因此位于它们的恒星托儿所附近,但双星中子星可能在更长的时间尺度上合并,因此可能有时间进行明显的迁移。双中子星并合电磁余辉辐射的强度和性质是环并合环境的敏感函数。虽然短伽玛暴的爆炸地点已经在文献中进行了探索,但这个问题还没有在宇宙学背景下得到充分解决。我们提出了宇宙学模拟的演化星系团,包括恒星形成结合二进制人口合成模型,以自洽跟踪的位置和环境气体密度紧凑的二进制合并网站在整个宇宙网络。我们提出的概率分布密度作为红移的函数,并讨论模型的敏感性人口合成模型的假设。

英文摘要:

The simultaneous detection of gravitational and electromagnetic waves from a binary neutron star merger has both solidified the link between neutron star mergers and short-duration gamma-ray bursts (GRBs) and demonstrated the ability of astronomers to follow-up the gravitational wave detection to place constraints on the ejecta from these mergers as well as the nature of the GRB engine and its surroundings. As the sensitivity of aLIGO and VIRGO increases, it is likely that a growing number of such detections will occur in the next few years, leading to a sufficiently-large number of events to constrain the populations of these GRB events. While long-duration GRBs originate from massive stars and thus are located near their stellar nurseries, binary neutron stars may merge on much longer timescales, and thus may have had time to migrate appreciably. The strength and character of the electromagnetic afterglow emission of binary neutron star mergers is a sensitive function of the circum-merger environment. Though the explosion sites of short GRBs have been explored in the literature, the question has yet to be fully addressed in its cosmological context. We present cosmological simulations following the evolution of a galaxy cluster including star formation combined with binary population synthesis models to self-consistently track the locations and environmental gas densities of compact binary merger sites throughout the cosmic web. We present probability distributions for densities as a function of redshift and discuss model sensitivity to population synthesis model assumptions.

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