Probing satellite galaxies in the Local Group by using FAST

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	Probing satellite galaxies in the Local Group by using FAST
	Li Jing 1; Wang Yougang 2; Kong Minzhi 1; Wang Jie 2; Chen Xuelei 2; Guo Rui 2
刊名	Research in Astronomy and Astrophysics
	2018
卷号	18 期号:1
ISSN号	1674-4527
英文摘要	The abundance of neutral hydrogen (HI) in satellite galaxies in the local group is important for studying the formation history of our local group. In this work, we generated mock HI satellite galaxies in the Local Group using the high mass-resolution hydrodynamic APOSTLE simulation. The simulated HI mass function agrees with the ALFALFA survey very well above 10(6) M-circle dot, although there is a discrepancy below this scale because of the observed flux limit. After carefully checking various systematic elements in the observations, including fitting of line width, sky coverage, integration time and frequency drift due to uncertainty in a galaxy's distance, we predicted the abundance of HI in galaxies in a future survey that will be conducted by FAST. FAST has a larger aperture and higher sensitivity than the Arecibo telescope. We found that the HI mass function could be estimated well around 10(5) M-circle dot if the integration time is 40 minutes. Our results indicate that there are 61 HI satellites in the Local Group and 36 in the FAST field above 10(5) M-circle dot. This estimation is one order of magnitude better than the current data, and will put a strong constraint on the formation history of the Local Group. Also more high resolution simulated samples are needed to achieve this target.
资助项目	[China Program of International ST Cooperation] ; [National Natural Science Foundation of China (NSFC)] ; [973 program] ; [NSFC]
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37069]
专题	中国科学院国家天文台
作者单位	1.河北师范大学 2.中国科学院国家天文台
推荐引用方式 GB/T 7714	Li Jing,Wang Yougang,Kong Minzhi,et al. Probing satellite galaxies in the Local Group by using FAST[J]. Research in Astronomy and Astrophysics,2018,18(1).
APA	Li Jing,Wang Yougang,Kong Minzhi,Wang Jie,Chen Xuelei,&Guo Rui.(2018).Probing satellite galaxies in the Local Group by using FAST.Research in Astronomy and Astrophysics,18(1).
MLA	Li Jing,et al."Probing satellite galaxies in the Local Group by using FAST".Research in Astronomy and Astrophysics 18.1(2018).