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arXiv 2108.04243astro-ph.HE
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来自中子星合并的红外尘埃回波

Infrared dust echoes from neutron star mergers

Wenbin Lu, Christopher F. McKee, Kunal P. Mooley

摘要:

一个显着的比例的双中子星合并发生在恒星形成星系的紫外光和软X射线余辉发射的相对论性喷流可能会被尘埃吸收,并在更长的波长重新发射。结果表明,对于发生在富气环境(n_H > 0.5 cm^{-3},几到几十pc)中,视角小于30 °的并合,詹姆斯·韦伯空间望远镜(JWST)可以探测到来自热尘埃的辐射,其探测率约为每年一次.尘埃排放和合并网站之间的空间分离是几个到10毫弧秒(源距离为150 Mpc),这可能是天体测量解决的JWST足够高的信噪比检测。测量通量质心的视超光速直接给出了合并的轨道倾角,可以结合引力波数据测量哈勃常数。对于喷流张开角内的视线,尘埃回波要明亮得多,可能会污染从短伽马射线暴中寻找千诺瓦候选者的工作,例如GRB 130603 B的情况。

英文摘要:

A significant fraction of binary neutron star mergers occur in star-forming galaxies where the UV-optical and soft X-ray afterglow emission from the relativistic jet may be absorbed by dust and re-emitted at longer wavelengths. We show that, for mergers occurring in gas-rich environment (n_H > 0.5 cm^{-3} at a few to tens of pc) and when the viewing angle is less than about 30 degrees, the emission from heated dust should be detectable by James Webb Space Telescope (JWST), with a detection rate of the order once per year. The spatial separation between the dust emission and the merger site is a few to 10 milli-arcsecs (for a source distance of 150 Mpc), which may be astrometrically resolved by JWST for sufficiently high signal-noise-ratio detections. Measuring the superluminal apparent speed of the flux centroid directly gives the orbital inclination of the merger, which can be combined with gravitational wave data to measure the Hubble constant. For a line of sight within the jet opening angle, the dust echoes are much brighter and may contaminate the search for kilonova candidates from short gamma-ray bursts, such as the case of GRB 130603B.

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。

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