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Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe
Zeng, Houdun1; Yan, Dahai2,3,4
2019-09-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume882Issue:2Pages:5
Corresponding AuthorZeng, Houdun(zhd@pmo.ac.cn)
AbstractThe attenuation produced by extragalactic background light (EBL) in gamma-ray spectra of blazars has been used to constrain the Hubble constant (H-0) and matter density (Omega(m)) of the universe. We propose to estimate H-0 and Omega(m) using the well-measured > 10 GeV extragalactic gamma-ray background (EGB). This suggestion is based on the fact that the > 10 GeV EGB is totally explained by the emissions from blazars, and an EBL-absorption cutoff occurs at similar to 50 GeV in the EGB spectrum. We fit the > 10 GeV EGB data with modeled EGB spectrum. This results in H-0 64.9(-4.3)(+4.6) km s(-1) Mpc(-1) and Omega(m) = 0.31(-0.14)(+0.13). Note that the uncertainties may be underestimated due to the limit of our realization for EBL model. H-0 and Omega(m) are degenerate in our method. Independent determination of Omega(m) by other methods would improve the constraint on H-0.
Keywordgalaxies: jets gamma rays: diffuse background gamma rays: galaxies
DOI10.3847/1538-4357/ab35e3
WOS KeywordLIGHT
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000484725300003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27927
Collection中国科学院紫金山天文台
Corresponding AuthorZeng, Houdun
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China
3.Chinese Acad Sci, Ctr Astron Megasci, 20A Datun Rd, Beijing 100012, Peoples R China
4.Yunnan Univ, Dept Astron, Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Houdun,Yan, Dahai. Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe[J]. ASTROPHYSICAL JOURNAL,2019,882(2):5.
APA Zeng, Houdun,&Yan, Dahai.(2019).Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe.ASTROPHYSICAL JOURNAL,882(2),5.
MLA Zeng, Houdun,et al."Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe".ASTROPHYSICAL JOURNAL 882.2(2019):5.
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