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Title: AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT

Abstract

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 μ m power spectra can be explained by axions with masses around 4 eV. The total axion abundance Ω{sub a} ≃ 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 distributionmore » is preferred by the data, which cannot be explained by the standard quantum chromodynamics theory and needs further discussion.« less

Authors:
;  [1]; ;  [2];  [3];  [4]
  1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012 (China)
  2. Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
  3. Center for Detectors, School of Physics and Astronomy, Rochester Institute of Technology, Rochester, NY 14623 (United States)
  4. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
22666109
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 825; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; ANISOTROPY; AXIONS; BARYONS; COMPARATIVE EVALUATIONS; GALAXY NUCLEI; MASS; MASS DISTRIBUTION; NONLUMINOUS MATTER; PARTICLE DECAY; PHOTONS; QUANTUM CHROMODYNAMICS; SPACE; SPECTRA; TELESCOPES; VISIBLE RADIATION; WAVELENGTHS

Citation Formats

Gong, Yan, Chen, Xuelei, Cooray, Asantha, Mitchell-Wynne, Ketron, Zemcov, Michael, and Smidt, Joseph. AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT. United States: N. p., 2016. Web. doi:10.3847/0004-637X/825/2/104.
Gong, Yan, Chen, Xuelei, Cooray, Asantha, Mitchell-Wynne, Ketron, Zemcov, Michael, & Smidt, Joseph. AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT. United States. doi:10.3847/0004-637X/825/2/104.
Gong, Yan, Chen, Xuelei, Cooray, Asantha, Mitchell-Wynne, Ketron, Zemcov, Michael, and Smidt, Joseph. Sun . "AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT". United States. doi:10.3847/0004-637X/825/2/104.
@article{osti_22666109,
title = {AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT},
author = {Gong, Yan and Chen, Xuelei and Cooray, Asantha and Mitchell-Wynne, Ketron and Zemcov, Michael and Smidt, Joseph},
abstractNote = {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 μ m power spectra can be explained by axions with masses around 4 eV. The total axion abundance Ω{sub a} ≃ 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.},
doi = {10.3847/0004-637X/825/2/104},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 825,
place = {United States},
year = {2016},
month = {7}
}