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arXiv 2109.02663astro-ph.HEastro-ph.GA
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快速射电暴主体的不对称HI 21厘米线:与星系相互作用的联系

Asymmetric HI 21 cm lines of fast radio burst hosts: connection with galaxy interaction

Michał J. Michałowski

摘要:

快速射电暴(FRB)是一种具有极短射电辐射的神秘瞬变现象。它们的性质仍有广泛的争论。我提供了一个小样本的FRB主机的原子气体性质的第一次分析,以约束其性质。HI观测存在于FRB 181030 A的宿主NGC 3252,FRB 200120 E的宿主M81和FRB 200428的宿主银河系。我报告三个观察结果:i)所有三个FRB主机是相互作用的星系; ii)的Hi光谱的两个FRB主机与这样的数据是高度不对称的,几个标准偏差以上的一般人口的星系; iii)两个FRB主机有正常的原子气体性质和一个是强烈缺乏原子气体。这表明,附近和重复的FRB与最近由于相互作用而增强的恒星形成有关。这支持快速的FRB通道,例如具有短延迟时间的大质量恒星,使得引起祖先诞生的相互作用签名仍然可见。长伽马射线暴(GRB)和宽线Ic型超新星(SN)的宿主具有更对称的光谱,尽管它们被认为经历了来自星系际介质的气体流入。这种差异可以解释为FRB主体所经历的相互作用比这些气体流入更具破坏性,或者质量效应,GRB/SN主体在较低质量下具有较少的组织气体运动,因此HI线更接近对称高斯。这也表明FRB和GRB的发射机制是不同的。

英文摘要:

Fast radio bursts (FRBs) are enigmatic transients with very short radio emission. Their nature is still widely debated. I provide the first analysis of atomic gas properties of a small sample of FRB hosts to constrain their nature. HI observations exist for NGC 3252, the host of FRB 181030A, M81, the host of FRB 200120E, and the Milky Way, the host of FRB 200428. I report three observables: i) all three FRB hosts are interacting galaxies; ii) the Hi spectra of both FRB hosts with such data available are highly asymmetric, several standard deviations above the general population of galaxies; iii) two FRB hosts have normal atomic gas properties and one is strongly deficient in atomic gas. This indicates that nearby and repeating FRBs are connected with a recent enhancement of star formation due to interaction. This supports fast FRB channels, for example a massive star with a short delay time so that interaction signatures giving rise to the birth of the progenitor are still visible. Long gamma-ray burst (GRB) and broad-lined type Ic supernova (SN) hosts exhibit much more symmetric spectra, even though they were claimed to experience gas inflow from the intergalactic medium. The difference can be explained by the interactions experienced by FRB hosts being more disruptive than these gas inflows, or by the mass effect, with GRB/SN hosts at lower masses having less organized gas motions, so with HI lines closer to a symmetrical Gaussian. This also suggests that the emission mechanisms of FRBs and GRBs are different.

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