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Title: Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos

Abstract

The Large Area Telescope (LAT) aboard the Fermi satellite allows us to study the high-energy γ-ray sky with unprecedented sensitivity. However, the origin of 31% of the detected γ-ray sources remains unknown. This population of unassociated γ-ray sources may contain new object classes, among them sources of photons from self-annihilating or decaying non-baryonic dark matter. Fermi-LAT might be capable to detect up to a few of these dark matter subhalos as faint and moderately extended γ-ray sources with a temporally steady high-energy emission. After applying corresponding selection cuts to the second year Fermi catalog 2FGL, we investigate 13 candidate objects in more detail including their multi-wavelength properties in the radio, infrared, optical, UV, and X-ray bands. For the γ-ray band, we analyze both the 24-month and 42-month Fermi-LAT data sets. We probe the γ-ray spectra for indications of a spectral cutoff, which singles out four sources of particular interest. We find all sources to be compatible with a point-source scenario. Multi-wavelength associations and, in particular, their infrared color-color data indicate no source to be compatible with a dark matter origin, and we find the majority of the candidates to probably originate from faint, high-frequency peaked BL Lac type objects. Wemore » discuss possibilities to further investigate source candidates and future prospects to search for dark matter subhalos.« less

Authors:
;  [1]
  1. University of Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, D-22761 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22279853
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; 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; ASTROPHYSICS; COLOR MODEL; COSMOLOGY; ENERGY SPECTRA; GAMMA SPECTRA; NONLUMINOUS MATTER; PHOTONS; POINT SOURCES; TELESCOPES; X RADIATION

Citation Formats

Zechlin, Hannes-S., and Horns, Dieter. Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/050.
Zechlin, Hannes-S., & Horns, Dieter. Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos. United States. https://doi.org/10.1088/1475-7516/2012/11/050
Zechlin, Hannes-S., and Horns, Dieter. Thu . "Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos". United States. https://doi.org/10.1088/1475-7516/2012/11/050.
@article{osti_22279853,
title = {Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos},
author = {Zechlin, Hannes-S. and Horns, Dieter},
abstractNote = {The Large Area Telescope (LAT) aboard the Fermi satellite allows us to study the high-energy γ-ray sky with unprecedented sensitivity. However, the origin of 31% of the detected γ-ray sources remains unknown. This population of unassociated γ-ray sources may contain new object classes, among them sources of photons from self-annihilating or decaying non-baryonic dark matter. Fermi-LAT might be capable to detect up to a few of these dark matter subhalos as faint and moderately extended γ-ray sources with a temporally steady high-energy emission. After applying corresponding selection cuts to the second year Fermi catalog 2FGL, we investigate 13 candidate objects in more detail including their multi-wavelength properties in the radio, infrared, optical, UV, and X-ray bands. For the γ-ray band, we analyze both the 24-month and 42-month Fermi-LAT data sets. We probe the γ-ray spectra for indications of a spectral cutoff, which singles out four sources of particular interest. We find all sources to be compatible with a point-source scenario. Multi-wavelength associations and, in particular, their infrared color-color data indicate no source to be compatible with a dark matter origin, and we find the majority of the candidates to probably originate from faint, high-frequency peaked BL Lac type objects. We discuss possibilities to further investigate source candidates and future prospects to search for dark matter subhalos.},
doi = {10.1088/1475-7516/2012/11/050},
url = {https://www.osti.gov/biblio/22279853}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}