arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11874astro-ph.GA
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具有ALMA的六个GRB宿主星系的远红外恒星形成率

Far-infrared star-formation rates of six GRB host galaxies with ALMA

Tiger Yu-Yang Hsiao, Tetsuya Hashimoto, Jia-Yuan Chang, Tomotsugu Goto, Seong Jin Kim, Simon C. -C. Ho, Daryl Joe D. Santos, Ting-Yi Lu, Alvina Y. L. On, Ting-Wen Wang

摘要:

伽马射线暴(GRB)是研究宇宙恒星形成速率历史(CSFRH)的一种很有前途的示踪剂。为了利用伽玛暴揭示CSFRH,重要的是要了解它们是否是有偏的示踪剂。为了这个目的,它是至关重要的,以了解伽玛暴宿主星系的属性,相比场星系。本文报道了六个$z\sim2$红外亮伽玛暴宿主星系的ALMA远红外(FIR)观测结果,其中四个宿主星系是首次在静止标架FIR中观测到的。除了ALMA数据,我们收集了多波长的数据,从以前的研究为6个伽玛暴宿主星系。用\texttt{CIGALE}进行光谱能量分布(SED)拟合分析,研究宿主星系的物理性质,并检验是否需要活动星系核(AGN)和射电成分。我们的研究结果表明,最适合的模板的五个伽玛暴宿主星系不需要活动星系核的组件,这表明活动星系核的情况下。一个GRB宿主星系080207显示出非常小的活动星系核贡献。虽然推导出的恒星质量的三个主机星系大多与以前的研究是一致的,有趣的是,所有六个伽玛射线暴主机的恒星形成率(SFR)的值与以前的研究不一致。我们的研究结果表明,休息帧FIR观测的重要性,正确估计SFR覆盖热辐射的冷尘埃加热恒星形成。

英文摘要:

Gamma-Ray Bursts (GRBs) can be a promising tracer of cosmic star-formation rate history (CSFRH). In order to reveal the CSFRH using GRBs, it is important to understand whether they are biased tracers or not. For this purpose, it is crucial to understand properties of GRB host galaxies, in comparison to field galaxies. In this work, we report ALMA far-infrared (FIR) observations of six $z\sim2$ IR-bright GRB host galaxies, which are selected for the brightness in IR. Among them, four host galaxies are detected for the first time in the rest-frame FIR. In addition to the ALMA data, we collected multi-wavelength data from previous studies for the six GRB host galaxies. Spectral energy distribution (SED) fitting analyses were performed with \texttt{CIGALE} to investigate physical properties of the host galaxies, and to test whether active galactic nucleus (AGN) and radio components are required or not. Our results indicate that the best-fit templates of five GRB host galaxies do not require an AGN component, suggesting the absence of AGNs. One GRB host galaxy, 080207, shows a very small AGN contribution. While derived stellar masses of the three host galaxies are mostly consistent with those in previous studies, interestingly the value of star-formation rates (SFRs) of all six GRB hosts are inconsistent with previous studies. Our results indicate the importance of rest-frame FIR observations to correctly estimate SFRs by covering thermal emission from cold dust heated by star formation.

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