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Title: Unidentified gamma-ray sources as targets for indirect dark matter detection with the Fermi -Large Area Telescope

Abstract

We report that one of the predictions of the ΛCDM cosmological framework is the hierarchical formation of structure, giving rise to dark matter (DM) halos and subhalos. When the latter are massive enough they retain gas (i.e., baryons) and become visible. This is the case of the dwarf satellite galaxies in the Milky Way (MW) . Below a certain mass, halos may not accumulate significant amounts of baryons and remain completely dark. However, if DM particles are Weakly Interacting Massive Particles (WIMPs), we expect them to annihilate in subhalos, producing gamma rays which can be detected with the Fermi satellite. Using the three most recent point-source Fermi Large Area Telescope (LAT) catalogs (3FGL, 2FHL and 3FHL), we search for DM subhalo candidates among the unidentified sources, i.e., sources with no firm association to a known astrophysical object. We apply several selection criteria based on the expected properties of the DM-induced emission from subhalos, which allow us to significantly reduce the list of potential candidates. Then, by characterizing the minimum detection flux of the instrument and comparing our sample to predictions from the Via Lactea II (VL-II) N-body cosmological simulation, we place conservative and robust constraints on the $$\langle$$σ v$$\rangle$$-mDM parameter space. For annihilation via the τ+τ- channel, we put an upper limit of 4 × 10-26 (5 × 10-25) cm3s-1 for a mass of 10 (100) GeV . A critical improvement over previous treatments is the repopulation we made to include low-mass subhalos below the VL\nobreakdash-II mass resolution. Finally, with more advanced subhalo candidate filtering the sensitivity reach of our method can potentially improve these constraints by a factor 3 (2) for τ+τ- (b$$\bar{b}$$) channel.

Authors:
 [1];  [1];  [2];  [1];  [3];  [4];  [2];  [5]
  1. Universidad Autónoma de Madrid (Spain)
  2. Universidad Complutense de Madrid (Spain)
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); The Catholic Univ. of America, Washington, DC (United States)
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546970
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 07; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Coronado-Blázquez, Javier, Sánchez-Conde, Miguel A., Domínguez, Alberto, Aguirre-Santaella, Alejandra, Mauro, Mattia Di, Mirabal, Néstor, Nieto, Daniel, and Charles, Eric. Unidentified gamma-ray sources as targets for indirect dark matter detection with the Fermi -Large Area Telescope. United States: N. p., 2019. Web. https://doi.org/10.1088/1475-7516/2019/07/020.
Coronado-Blázquez, Javier, Sánchez-Conde, Miguel A., Domínguez, Alberto, Aguirre-Santaella, Alejandra, Mauro, Mattia Di, Mirabal, Néstor, Nieto, Daniel, & Charles, Eric. Unidentified gamma-ray sources as targets for indirect dark matter detection with the Fermi -Large Area Telescope. United States. https://doi.org/10.1088/1475-7516/2019/07/020
Coronado-Blázquez, Javier, Sánchez-Conde, Miguel A., Domínguez, Alberto, Aguirre-Santaella, Alejandra, Mauro, Mattia Di, Mirabal, Néstor, Nieto, Daniel, and Charles, Eric. Fri . "Unidentified gamma-ray sources as targets for indirect dark matter detection with the Fermi -Large Area Telescope". United States. https://doi.org/10.1088/1475-7516/2019/07/020. https://www.osti.gov/servlets/purl/1546970.
@article{osti_1546970,
title = {Unidentified gamma-ray sources as targets for indirect dark matter detection with the Fermi -Large Area Telescope},
author = {Coronado-Blázquez, Javier and Sánchez-Conde, Miguel A. and Domínguez, Alberto and Aguirre-Santaella, Alejandra and Mauro, Mattia Di and Mirabal, Néstor and Nieto, Daniel and Charles, Eric},
abstractNote = {We report that one of the predictions of the ΛCDM cosmological framework is the hierarchical formation of structure, giving rise to dark matter (DM) halos and subhalos. When the latter are massive enough they retain gas (i.e., baryons) and become visible. This is the case of the dwarf satellite galaxies in the Milky Way (MW) . Below a certain mass, halos may not accumulate significant amounts of baryons and remain completely dark. However, if DM particles are Weakly Interacting Massive Particles (WIMPs), we expect them to annihilate in subhalos, producing gamma rays which can be detected with the Fermi satellite. Using the three most recent point-source Fermi Large Area Telescope (LAT) catalogs (3FGL, 2FHL and 3FHL), we search for DM subhalo candidates among the unidentified sources, i.e., sources with no firm association to a known astrophysical object. We apply several selection criteria based on the expected properties of the DM-induced emission from subhalos, which allow us to significantly reduce the list of potential candidates. Then, by characterizing the minimum detection flux of the instrument and comparing our sample to predictions from the Via Lactea II (VL-II) N-body cosmological simulation, we place conservative and robust constraints on the $\langle$σ v$\rangle$-mDM parameter space. For annihilation via the τ+τ- channel, we put an upper limit of 4 × 10-26 (5 × 10-25) cm3s-1 for a mass of 10 (100) GeV . A critical improvement over previous treatments is the repopulation we made to include low-mass subhalos below the VL\nobreakdash-II mass resolution. Finally, with more advanced subhalo candidate filtering the sensitivity reach of our method can potentially improve these constraints by a factor 3 (2) for τ+τ- (b$\bar{b}$) channel.},
doi = {10.1088/1475-7516/2019/07/020},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2019,
place = {United States},
year = {2019},
month = {7}
}

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Figures / Tables:

Figure 1 Figure 1: Upper panel: DM annihilation spectra with overlaid eq. 2.4 parametric fit and interpolation for $t\bar{t}$ (left panel) and $b\bar{b}$ (right panel) for various DM masses. The points from [44] are marked by crosses, while the fit is plotted as solid lines. Note that in the case of $t\bar{t}$more » the plotted masses are larger because mt = 172 GeV. Lower panel: Integrated DM annihilation spectra (Nγ) for 2FHL setup (left) and 3FHL (right), for $b\bar{b}$. Both setups differ in the threshold energy. Note that Nγ = 0 if E < 50 GeV (E < 10 GeV) in the case of the 2FHL (3FHL) setup, where E = Eth. Blue crosses are the values of the integral, and orange line is the interpolation between the values of the integral, which is used to compute the DM constraints as described in § 5.« less

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    Works referencing / citing this record:

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

    • Coronado-Blázquez, Javier; Sánchez-Conde, Miguel A.; Mauro, Mattia Di
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