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Title: Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15

Abstract

The globular clusters are probably good targets for dark matter (DM) searches in γ-rays due to the possible adiabatic contraction of DM by baryons. In this work we analyse the three-year data collected by Fermi Large Area Telescope of globular clusters NGC 6388 and M 15 to search for possible DM signals. For NGC 6388 the detection of γ-ray emission was reported by Fermi collaboration, which is consistent with the emission of a population of millisecond pulsars. The spectral shape of NGC 6388 is also shown to be consistent with a DM contribution if assuming the annihilation final state is b b-bar . No significant γ-ray emission from M 15 is observed. We give the upper limits of DM contribution to γ-ray emission in both NGC 6388 and M 15, for annihilation final states b b-bar , W{sup +}W{sup −}, μ{sup +}μ{sup −}, τ{sup +}τ{sup −} and monochromatic line. The constraints are stronger than that derived from observation of dwarf galaxies by Fermi.

Authors:
; ; ;  [1];  [2]
  1. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
  2. Department of Physics, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22280125
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ASTROPHYSICS; BARYONS; COSMOLOGY; GALAXIES; MONOCHROMATIC RADIATION; NONLUMINOUS MATTER; PHOTON EMISSION; PULSARS; STAR CLUSTERS; TELESCOPES; W MINUS BOSONS; W PLUS BOSONS

Citation Formats

Feng, Lei, Yuan, Qiang, Yin, Peng-Fei, Bi, Xiao-Jun, and Li, Mingzhe. Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/04/030.
Feng, Lei, Yuan, Qiang, Yin, Peng-Fei, Bi, Xiao-Jun, & Li, Mingzhe. Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15. United States. doi:10.1088/1475-7516/2012/04/030.
Feng, Lei, Yuan, Qiang, Yin, Peng-Fei, Bi, Xiao-Jun, and Li, Mingzhe. Sun . "Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15". United States. doi:10.1088/1475-7516/2012/04/030.
@article{osti_22280125,
title = {Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15},
author = {Feng, Lei and Yuan, Qiang and Yin, Peng-Fei and Bi, Xiao-Jun and Li, Mingzhe},
abstractNote = {The globular clusters are probably good targets for dark matter (DM) searches in γ-rays due to the possible adiabatic contraction of DM by baryons. In this work we analyse the three-year data collected by Fermi Large Area Telescope of globular clusters NGC 6388 and M 15 to search for possible DM signals. For NGC 6388 the detection of γ-ray emission was reported by Fermi collaboration, which is consistent with the emission of a population of millisecond pulsars. The spectral shape of NGC 6388 is also shown to be consistent with a DM contribution if assuming the annihilation final state is b b-bar . No significant γ-ray emission from M 15 is observed. We give the upper limits of DM contribution to γ-ray emission in both NGC 6388 and M 15, for annihilation final states b b-bar , W{sup +}W{sup −}, μ{sup +}μ{sup −}, τ{sup +}τ{sup −} and monochromatic line. The constraints are stronger than that derived from observation of dwarf galaxies by Fermi.},
doi = {10.1088/1475-7516/2012/04/030},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2012,
place = {United States},
year = {2012},
month = {4}
}