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arXiv 2106.09710astro-ph.HEastro-ph.GA
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FRB 20201124 A的宿主星系和持久射电对应物

The host galaxy and persistent radio counterpart of FRB 20201124A

Vikram Ravi, Casey J. Law, Dongzi Li, Kshitij Aggarwal, Sarah Burke-Spolaor, Liam Connor, T. Joseph W. Lazio, Dana Simard, Jean Somalwar, Shriharsh P. Tendulkar

摘要:

快速射电暴(FRB)宿主星系的物理性质为研究FRB源的性质提供了重要线索。到目前为止,已确定的16个FRB宿主在质量和特定恒星形成速率上跨越了三个数量级,这意味着一个普遍存在的祖先物体。以~弧秒精度定位的FRB还可以有效地搜索相关的多波长和多时间尺度对应物,例如与FRB 20121102 A相关的持久射电源。在这里,我们提出了一个重复源FRB 20201124 A的本地化,以及它与宿主星系(SDSS J050803.48+260338.0,z=0.098)和持久的无线电源的关联。该星系质量巨大($\sim3\times10^{10} M_{\odot}$),恒星形成(每年只有几个太阳质量),尘埃。甚大阵和甚长基线阵对持久性射电源的观测测量了$1.2\times10^{29}$ erg s $^{-1}$ Hz $^{-1}$的光度,并显示出在$\gtrsim50$ mas尺度上的扩展。我们将这种射电辐射与SDSS J050803.48+260338.0中正在进行的恒星形成活动联系起来。更深入,更详细的观测需要更好地利用欧洲VLBI网络报告的FRB 20201124 A的毫角秒尺度定位,并确定主机贡献的大色散测量($150-220$ pc cm $^{-3}$)的起源。SDSS J050803.48+260338.0的质量比任何先前与重复FRB源相关的星系或恒星系统都要大一个数量级,但与迄今为止非重复FRB的宿主相当,进一步建立了两个明显的人口之间的联系。

英文摘要:

The physical properties of fast radio burst (FRB) host galaxies provide important clues towards the nature of FRB sources. The 16 FRB hosts identified thus far span three orders of magnitude in mass and specific star-formation rate, implicating a ubiquitously occurring progenitor object. FRBs localised with ~arcsecond accuracy also enable effective searches for associated multi-wavelength and multi-timescale counterparts, such as the persistent radio source associated with FRB 20121102A. Here we present a localisation of the repeating source FRB 20201124A, and its association with a host galaxy (SDSS J050803.48+260338.0, z=0.098) and persistent radio source. The galaxy is massive ($\sim3\times10^{10} M_{\odot}$), star-forming (few solar masses per year), and dusty. Very Large Array and Very Long Baseline Array observations of the persistent radio source measure a luminosity of $1.2\times10^{29}$ erg s$^{-1}$ Hz$^{-1}$, and show that is extended on scales $\gtrsim50$ mas. We associate this radio emission with the ongoing star-formation activity in SDSS J050803.48+260338.0. Deeper, more detailed observations are required to better utilise the milliarcsecond-scale localisation of FRB 20201124A reported from the European VLBI Network, and determine the origin of the large dispersion measure ($150-220$ pc cm$^{-3}$) contributed by the host. SDSS J050803.48+260338.0 is an order of magnitude more massive than any galaxy or stellar system previously associated with a repeating FRB source, but is comparable to the hosts of so far non-repeating FRBs, further building the link between the two apparent populations.

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