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Title: Velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [3];  [1];  [4];  [5];  [6]
  1. Texas A & M University, College Station, TX (United States)
  2. York University, Toronto, ON (Canada)
  3. University of Alberta, Edmonton, AB (Canada); York University, Toronto, ON (Canada)
  4. University of Durham (United Kingdom)
  5. Instituto de Astrofísica de Canarias, Tenerife (Spain); Universidad de La Laguna, Tenerife (Spain)
  6. University of Bologna (Italy)
+ Show Author Affiliations

We use the suite of Milky Way-like galaxies in the Auriga simulations to determine the contribution to annihilation radiation from dark matter subhalos in three velocity-dependent dark matter annihilation models: Sommerfeld, p-wave, and d-wave models. We compare these to the corresponding distribution in the velocity-independent s-wave annihilation model. For both the hydrodynamical and dark-matter-only simulations, only in the case of the Sommerfeld-enhanced annihilation does the total annihilation flux from subhalos exceed the total annihilation flux from the smooth halo component within the virial radius of the halo. Progressing from Sommerfeld to the s, p, and d-wave models, the contribution from the smooth component of the halo becomes more dominant, implying that for the p-wave and d-wave models the smooth component is by far the dominant contribution to the radiation. Comparing to the Galactic center excess observed by Fermi-LAT, for all simulated halos the emission is dominated by the smooth halo contribution. However, it is possible that for Sommerfeld models, extrapolation down to mass scales below the current resolution limit of the simulation would imply a non-negligible contribution to the gamma-ray emission from the Galactic Center region.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Texas A&M University; Natural Sciences and Engineering Research Council of Canada (NSERC); European Research Council (ERC); Spanish Ministry of Science and Innovation (MICINN); Science and Technology Facilities Council (STFC); Department of Business, Energy and Industrial Strategy (BEIS)
Grant/Contract Number:
SC0010813; RGPIN-2020-07138; 786910; CEX2019-000920-S; ST/K00042X/1; ST/P002293/1; T/R002371/1; ST/S002502/1; ST/R000832/1
OSTI ID:
1979368
Journal Information:
Journal of Cosmology and Astroparticle Physics, Vol. 2022, Issue 08; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

References (39)

Dark matter annihilation rates with velocity-dependent annihilation cross sections journal April 2009
Dark matter in dwarf spheroidal galaxies and indirect detection: a review journal March 2018
E pur si muove: Galilean-invariant cosmological hydrodynamical simulations on a moving mesh journal January 2010
Velocity-dependent J-factors for annihilation radiation from cosmological simulations journal April 2021
Characteristics of the Galactic Center excess measured with 11 years of F e r m i -LAT data journal March 2021
The Fermi–LAT Galactic Center Excess: Evidence of Annihilating Dark Matter? journal October 2020
The inner structure of  CDM haloes -- I. A numerical convergence study journal January 2003
Populating a cluster of galaxies - I. Results at \fontshape{it}{z}=0 journal December 2001
Effective J -factor of the Galactic Center for velocity-dependent dark matter annihilation journal September 2018
Baryonic effects on the detectability of annihilation radiation from dark matter subhaloes around the Milky Way journal December 2020
Constraint on the velocity dependent dark matter annihilation cross section from gamma-ray and kinematic observations of ultrafaint dwarf galaxies journal March 2018
Heavy dark matter through the Higgs portal journal July 2008
The EAGLE project: simulating the evolution and assembly of galaxies and their environments journal November 2014
Amplified J-factors in the Galactic Centre for velocity-dependent dark matter annihilation in FIRE simulations journal April 2022
Fermi Large Area Telescope observations of Local Group galaxies: detection of M 31 and search for M 33 journal November 2010
Sommerfeld-enhanced J -factors for dwarf spheroidal galaxies journal June 2017
Prospects for detecting supersymmetric dark matter in the Galactic halo journal November 2008
The redshift dependence of the structure of massive Λ cold dark matter haloes journal June 2008
Cosmological constraints on dark matter models with velocity-dependent annihilation cross section journal June 2011
Dark matter annihilation and the Galactic Centre Excess journal February 2022
Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos journal September 2019
Dark matter annihilation in the Galactic Center as seen by the Fermi Gamma Ray Space Telescope journal March 2011
Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data journal November 2015
Universal structure of dark matter haloes over a mass range of 20 orders of magnitude journal September 2020
Wimp searches with gamma rays in the Fermi era: Challenges, methods and results journal December 2015
Anatomy of Eddington-like inversion methods in the context of dark matter searches journal September 2018
The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations journal April 2015
Dark matter interpretation of the Fermi -LAT observations toward the outer halo of M31 journal January 2021
Planck 2015 results : XIII. Cosmological parameters journal September 2016
Near to long-term forecasts in x-ray and gamma-ray bands: Are we entering the era of dark matter astronomy? journal October 2020
Phat ELVIS: The inevitable effect of the Milky Way’s disc on its dark matter subhaloes journal June 2019
Dark matter and cosmic structure journal September 2012
Optimal observing strategies for velocity-suppressed dark matter annihilation journal December 2021
A new way of setting the phases for cosmological multiscale Gaussian initial conditions journal July 2013
WIMPonium and boost factors for indirect dark matter detection journal June 2009
The impact of the phase-space density on the indirect detection of dark matter journal September 2013
On velocity-dependent dark matter annihilations in dwarf satellites journal December 2018
The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time journal January 2017
Distribution function of dark matter journal January 2006

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79 ASTRONOMY AND ASTROPHYSICS
dark matter simulations
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