QiZhi Huang1; FengQuan Wu1; XueLei Chen1
Source Publication中国科学物理学力学天文学英文版
AbstractThe 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.
Funding Project[National Natural Science Foundation of Guangdong] ; [Ministry of Science and Technology] ; [National Natural Science Foundation of China] ; [Chinese Academy of Sciences] ; [China Scholarship Council Cai Yuanpei Grant]
Document Type期刊论文
Affiliation1.Key Laboratory of Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences
2.Universite Paris-Sud,LAL,France
4.Centerfor High Energy Physics,Peking University
Recommended Citation
GB/T 7714
QiZhi Huang,FengQuan Wu,XueLei Chen. ahighresolutionselfconsistentwholeskyforegroundmodel[J]. 中国科学物理学力学天文学英文版,2019,062(008):104.
APA QiZhi Huang,FengQuan Wu,&XueLei Chen.(2019).ahighresolutionselfconsistentwholeskyforegroundmodel.中国科学物理学力学天文学英文版,062(008),104.
MLA QiZhi Huang,et al."ahighresolutionselfconsistentwholeskyforegroundmodel".中国科学物理学力学天文学英文版 062.008(2019):104.
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