Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe
文献类型：期刊论文
| 作者 | Zeng, Houdun1; Yan, Dahai2,3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-09-10 |
| 卷号 | 882期号:2页码:5 |
| ISSN号 | 0004-637X |
| 关键词 | galaxies: jets gamma rays: diffuse background gamma rays: galaxies |
| DOI | 10.3847/1538-4357/ab35e3 |
| 通讯作者 | Zeng, Houdun(zhd@pmo.ac.cn) |
| 英文摘要 | The 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. |
| WOS关键词 | LIGHT |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000484725300003 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/27926]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Zeng, Houdun |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：紫金山天文台
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