skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos

Abstract

Dark matter annihilations taking place in nearby subhalos could appear as gamma-ray sources without detectable counterparts at other wavelengths. In this study, we consider the collection of unassociated gamma-ray sources reported by the Fermi Collaboration in an effort to identify the most promising dark matter subhalo candidates. While we identify 24 bright, high-latitude, non-variable sources with spectra that are consistent with being generated by the annihilations of ∼ 20–70 GeV dark matter particles (assuming annihilations to b b-bar ), it is not possible at this time to distinguish these sources from radio-faint gamma-ray pulsars. Deeper multi-wavelength observations will be essential to clarify the nature of these sources. It is notable that we do not find any such sources that are well fit by dark matter particles heavier than ∼100 GeV. We also study the angular distribution of the gamma-rays from this set of subhalo candidates, and find that the source 3FGL J2212.5+0703 prefers a spatially extended profile (of width ∼ 0.15°) over that of a point source, with a significance of 4.2σ (3.6σ after trials factor). Although not yet definitive, this bright and high-latitude gamma-ray source is well fit as a nearby subhalo of m{sub χ} ≅ 20–50 GeV dark matter particlesmore » (annihilating to b b-bar ) and merits further multi-wavelength investigation. Based on the subhalo distribution predicted by numerical simulations, we derive constraints on the dark matter annihilation cross section that are competitive to those resulting from gamma-ray observations of dwarf spheroidal galaxies, the Galactic Center, and the extragalactic gamma-ray background.« less

Authors:
 [1];  [2];  [3]
  1. Department of Physics, University of Washington, Seattle, WA 98195 (United States)
  2. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)
  3. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
Publication Date:
OSTI Identifier:
22525118
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR DISTRIBUTION; ANNIHILATION; CATALOGS; COMPUTERIZED SIMULATION; COSMIC GAMMA SOURCES; CROSS SECTIONS; GALAXIES; GAMMA RADIATION; GEV RANGE; INTERGALACTIC SPACE; LIMITING VALUES; NONLUMINOUS MATTER; PULSARS

Citation Formats

Bertoni, Bridget, Hooper, Dan, and Linden, Tim, E-mail: bbertoni@stanford.edu, E-mail: dhooper@fnal.gov, E-mail: linden.70@osu.edu. Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/12/035.
Bertoni, Bridget, Hooper, Dan, & Linden, Tim, E-mail: bbertoni@stanford.edu, E-mail: dhooper@fnal.gov, E-mail: linden.70@osu.edu. Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos. United States. doi:10.1088/1475-7516/2015/12/035.
Bertoni, Bridget, Hooper, Dan, and Linden, Tim, E-mail: bbertoni@stanford.edu, E-mail: dhooper@fnal.gov, E-mail: linden.70@osu.edu. Tue . "Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos". United States. doi:10.1088/1475-7516/2015/12/035.
@article{osti_22525118,
title = {Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos},
author = {Bertoni, Bridget and Hooper, Dan and Linden, Tim, E-mail: bbertoni@stanford.edu, E-mail: dhooper@fnal.gov, E-mail: linden.70@osu.edu},
abstractNote = {Dark matter annihilations taking place in nearby subhalos could appear as gamma-ray sources without detectable counterparts at other wavelengths. In this study, we consider the collection of unassociated gamma-ray sources reported by the Fermi Collaboration in an effort to identify the most promising dark matter subhalo candidates. While we identify 24 bright, high-latitude, non-variable sources with spectra that are consistent with being generated by the annihilations of ∼ 20–70 GeV dark matter particles (assuming annihilations to b b-bar ), it is not possible at this time to distinguish these sources from radio-faint gamma-ray pulsars. Deeper multi-wavelength observations will be essential to clarify the nature of these sources. It is notable that we do not find any such sources that are well fit by dark matter particles heavier than ∼100 GeV. We also study the angular distribution of the gamma-rays from this set of subhalo candidates, and find that the source 3FGL J2212.5+0703 prefers a spatially extended profile (of width ∼ 0.15°) over that of a point source, with a significance of 4.2σ (3.6σ after trials factor). Although not yet definitive, this bright and high-latitude gamma-ray source is well fit as a nearby subhalo of m{sub χ} ≅ 20–50 GeV dark matter particles (annihilating to b b-bar ) and merits further multi-wavelength investigation. Based on the subhalo distribution predicted by numerical simulations, we derive constraints on the dark matter annihilation cross section that are competitive to those resulting from gamma-ray observations of dwarf spheroidal galaxies, the Galactic Center, and the extragalactic gamma-ray background.},
doi = {10.1088/1475-7516/2015/12/035},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 12,
volume = 2015,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 2015},
month = {Tue Dec 01 00:00:00 EST 2015}
}