A high-resolution self-consistent whole sky foreground model

doi:10.1007/s11433-018-9333-1

CORC > 国家天文台 > 中国科学院国家天文台

	A high-resolution self-consistent whole sky foreground model
	Huang, QiZhi 1,2,3; Wu, FengQuan 1; Chen, XueLei 1,4,5
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2019-08-01
卷号	62 期号:8 页码:13
关键词	neutral hydrogen 21 cm line foreground model whole sky map simulation
ISSN号	1674-7348
DOI	10.1007/s11433-018-9333-1
英文摘要	The neutral hydrogen 21 cm line is potentially a very powerful probe of the observable universe, and a number of on-going experiments are trying to detect it at cosmological distances. However, the presence of strong foreground radiations such as the galactic synchrotron radiation, galactic free-free emission and extragalactic radio sources make it a very challenging task. For the design of 21 cm experiments and analysis of their data, simulation is an essential tool, and good sky foreground model is needed. With existing data the whole sky maps are available only in low angular resolutions or for limited patches of sky, which is inadequate in the simulation of these new 21 cm experiments. In this paper, we present the method of constructing a high resolution self-consistent sky model at low frequencies, which incorporates both diffuse foreground and point sources. Our diffuse map is constructed by generating physical foreground components including the galactic synchrotron emission and galactic free-free emission. The point source sample is generated using the actual data from the NRAO VLA Sky Survey (NVSS) and the Sydney University Molonglo Sky Survey (SUMSS) where they are available and complete in flux limit, and mock point sources according to statistical distributions. The entire model is made self-consistent by removing the integrated flux of the point sources from the diffuse map so that this part of radiation is not double counted. We show that with the point sources added, a significant angular power is introduced in the mock sky map, which may be important for foreground subtraction simulations. Our sky maps and point source catalogues are available to download.
资助项目	National Natural Science Foundation of Guangdong[U1501501] ; Ministry of Science and Technology[2016YFE0100300] ; National Natural Science Foundation of China[11473044] ; National Natural Science Foundation of China[11761141012] ; National Natural Science Foundation of China[11633004] ; National Natural Science Foundation of China[11653003] ; Chinese Academy of Sciences[QYZDJ-SSW-SLH017] ; China Scholarship Council Cai Yuanpei Grant
WOS关键词	NONTHERMAL BACKGROUND-RADIATION ; RADIO-CONTINUUM EMISSION ; 21 CENTIMETER TOMOGRAPHY ; SOUTHERN SKY ; 1420 MHZ ; POLARIZATION LEAKAGE ; SYNCHROTRON EMISSION ; REIONIZATION WINDOWS ; LUMINOSITY FUNCTIONS ; INTERGALACTIC MEDIUM
WOS研究方向	Physics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000466940400001
资助机构	National Natural Science Foundation of Guangdong ; National Natural Science Foundation of Guangdong ; Ministry of Science and Technology ; Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Scholarship Council Cai Yuanpei Grant ; China Scholarship Council Cai Yuanpei Grant ; National Natural Science Foundation of Guangdong ; National Natural Science Foundation of Guangdong ; Ministry of Science and Technology ; Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Scholarship Council Cai Yuanpei Grant ; China Scholarship Council Cai Yuanpei Grant ; National Natural Science Foundation of Guangdong ; National Natural Science Foundation of Guangdong ; Ministry of Science and Technology ; Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Scholarship Council Cai Yuanpei Grant ; China Scholarship Council Cai Yuanpei Grant ; National Natural Science Foundation of Guangdong ; National Natural Science Foundation of Guangdong ; Ministry of Science and Technology ; Ministry of Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Scholarship Council Cai Yuanpei Grant ; China Scholarship Council Cai Yuanpei Grant
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26055]
专题	中国科学院国家天文台
通讯作者	Chen, XueLei
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100101, Peoples R China 2.Univ Paris Sud, LAL, UMR 8607, F-91898 Orsay, France 3.CNRS, IN2P3, F-91405 Orsay, France 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 5.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Huang, QiZhi,Wu, FengQuan,Chen, XueLei. A high-resolution self-consistent whole sky foreground model[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2019,62(8):13.
APA	Huang, QiZhi,Wu, FengQuan,&Chen, XueLei.(2019).A high-resolution self-consistent whole sky foreground model.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,62(8),13.
MLA	Huang, QiZhi,et al."A high-resolution self-consistent whole sky foreground model".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 62.8(2019):13.