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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
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 12; 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; 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. 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. Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos. United States. https://doi.org/10.1088/1475-7516/2015/12/035
Bertoni, Bridget, Hooper, Dan, and Linden, Tim. Tue . "Examining The Fermi-LAT Third Source Catalog in search of dark matter subhalos". United States. https://doi.org/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},
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},
url = {https://www.osti.gov/biblio/22525118}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 12,
volume = 2015,
place = {United States},
year = {2015},
month = {12}
}

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    Works referencing / citing this record:

    γ-ray and ν Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential
    journal, May 2019


    γ-ray and ν Searches for Dark-Matter Subhalos in the Milky Way with a Baryonic Potential
    journal, May 2019


    A review of indirect searches for particle dark matter
    journal, June 2016


    Dark matter in dwarf spheroidal galaxies and indirect detection: a review
    journal, March 2018


    Is the gamma-ray source 3FGL J2212.5+0703 a dark matter subhalo?
    journal, May 2016


    Gamma rays from dark matter subhalos revisited: refining the predictions and constraints
    journal, April 2017


    Unidentified gamma-ray sources as targets for indirect dark matter detection with the Fermi -Large Area Telescope
    journal, July 2019


    Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources
    journal, November 2019


    A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter
    journal, July 2018


    Primordial black holes as silver bullets for new physics at the weak scale
    journal, December 2019


    Realistic estimation for the detectability of dark matter subhalos using Fermi-LAT catalogs
    journal, September 2017


    Search for line-like signals in the all-sky Fermi-LAT data
    journal, June 2019


    Multimessenger Multi-TeV Dark Matter
    journal, April 2019


    Searching for Gamma-Ray Millisecond Pulsars: Selection of Candidates Revisited
    journal, February 2019


    Gamma-Ray Sensitivity to Dark Matter Subhalo Modelling at High Latitudes
    journal, November 2019


    Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources
    journal, December 2019