AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT

	AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT
	Gong, Yan1,2 ; Cooray, Asantha 2; Mitchell-Wynne, Ketron 2; Chen, Xuelei1,3 ; Zemcov, Michael 4; Smidt, Joseph 5
刊名	ASTROPHYSICAL JOURNAL
	2016-07-10
卷号	825 期号:2
关键词	cosmology: theory diffuse radiation large-scale structure of universe
英文摘要	The extragalactic background light (EBL) is composed of the cumulative radiation from all galaxies and active galactic nuclei over cosmic history. In addition to point sources, the EBL also contains information from diffuse sources of radiation. The angular power spectra of the near-infrared intensities could contain additional signals, and a complete understanding of the nature of the infrared (IR) background is still lacking in the literature. Here we explore the constraints that can be placed on particle decays, especially candidate dark matter (DM) models involving axions that trace DM halos of galaxies. Axions with a mass around a few electronvolts will decay via two photons with wavelengths in the near-IR band and will leave a signature in the IR background intensity power spectrum. Using recent power spectra measurements from the Hubble Space Telescope and the Cosmic Infrared Background Experiment, we find that the 0.6-1.6 mu m power spectra can be explained by axions with masses around 4 eV. The total axion abundance Omega(a) similar or equal to 0.05, and it is comparable to the baryon density of the universe. The suggested mean axion mass and abundance are not ruled out by existing cosmological observations. Interestingly, the axion model with a mass distribution is preferred by the data, which cannot be explained by the standard quantum chromodynamics theory and needs further discussion.
收录类别	SCI
语种	英语
WOS记录号	WOS:000381940800022
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5280]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA 3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 4.Rochester Inst Technol, Sch Phys & Astron, Ctr Detectors, Rochester, NY 14623 USA 5.Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
推荐引用方式 GB/T 7714	Gong, Yan,Cooray, Asantha,Mitchell-Wynne, Ketron,et al. AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT[J]. ASTROPHYSICAL JOURNAL,2016,825(2).
APA	Gong, Yan,Cooray, Asantha,Mitchell-Wynne, Ketron,Chen, Xuelei,Zemcov, Michael,&Smidt, Joseph.(2016).AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT.ASTROPHYSICAL JOURNAL,825(2).
MLA	Gong, Yan,et al."AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT".ASTROPHYSICAL JOURNAL 825.2(2016).