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

Title: Effective J -factor of the Galactic Center for velocity-dependent dark matter annihilation

Abstract

Here, we introduce the effective J -factors for the Milky Way for scenarios in which dark matter annihilation is p -wave or d -wave suppressed. We find that the velocity suppression of dark matter annihilation can have a sizable effect on the morphology of a potential dark matter annihilation signal in the Galactic Center. The gamma-ray flux from the innermost region of the Galactic Center is in particular suppressed. We discover that for dark matter density profiles with steep inner slopes, the morphology of the inner Galaxy gamma-ray emission in p -wave models can be made similar to the morphology in standard s -wave models. This similarity may suggest that model discrimination between s wave and p wave is challenging, e.g., when fitting the Galactic Center excess. However, we show that it is difficult to simultaneously match s - and p -wave morphologies at both large and small angular scales. The J -factors we calculate may be implemented with astrophysical foreground models to self-consistently determine the morphology of the excess with velocity-suppressed dark matter annihilation.

Authors:
 [1];  [2];  [3]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Univ. of Hawaii, Honolulu, HI (United States)
  3. Texas A & M Univ., College Station, TX (United States)
Publication Date:
Research Org.:
Univ. of Hawaii, Honolulu, HI (United States); Texas A & M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1598042
Alternate Identifier(s):
OSTI ID: 1471755
Grant/Contract Number:  
[SC0010504; PHY-1748958; PHY-1250573; SC0010813]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
[ Journal Volume: 98; Journal Issue: 6]; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Boddy, Kimberly K., Kumar, Jason, and Strigari, Louis E. Effective J-factor of the Galactic Center for velocity-dependent dark matter annihilation. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.063012.
Boddy, Kimberly K., Kumar, Jason, & Strigari, Louis E. Effective J-factor of the Galactic Center for velocity-dependent dark matter annihilation. United States. doi:10.1103/PhysRevD.98.063012.
Boddy, Kimberly K., Kumar, Jason, and Strigari, Louis E. Thu . "Effective J-factor of the Galactic Center for velocity-dependent dark matter annihilation". United States. doi:10.1103/PhysRevD.98.063012. https://www.osti.gov/servlets/purl/1598042.
@article{osti_1598042,
title = {Effective J-factor of the Galactic Center for velocity-dependent dark matter annihilation},
author = {Boddy, Kimberly K. and Kumar, Jason and Strigari, Louis E.},
abstractNote = {Here, we introduce the effective J-factors for the Milky Way for scenarios in which dark matter annihilation is p-wave or d-wave suppressed. We find that the velocity suppression of dark matter annihilation can have a sizable effect on the morphology of a potential dark matter annihilation signal in the Galactic Center. The gamma-ray flux from the innermost region of the Galactic Center is in particular suppressed. We discover that for dark matter density profiles with steep inner slopes, the morphology of the inner Galaxy gamma-ray emission in p-wave models can be made similar to the morphology in standard s-wave models. This similarity may suggest that model discrimination between s wave and p wave is challenging, e.g., when fitting the Galactic Center excess. However, we show that it is difficult to simultaneously match s- and p-wave morphologies at both large and small angular scales. The J-factors we calculate may be implemented with astrophysical foreground models to self-consistently determine the morphology of the excess with velocity-suppressed dark matter annihilation.},
doi = {10.1103/PhysRevD.98.063012},
journal = {Physical Review D},
number = [6],
volume = [98],
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Dark matter annihilation in the Galactic Center as seen by the Fermi Gamma Ray Space Telescope
journal, March 2011


The characterization of the gamma-ray signal from the central Milky Way: A case for annihilating dark matter
journal, June 2016


Dark matter interpretation of the Fermi -LAT observation toward the Galactic Center
journal, May 2017


The Fermi Galactic Center GeV Excess and Implications for Dark Matter
journal, May 2017


Extracting limits on dark matter annihilation from gamma ray observations towards dwarf spheroidal galaxies
journal, July 2012


Background model systematics for the Fermi GeV excess
journal, March 2015

  • Calore, Francesca; Cholis, Ilias; Weniger, Christoph
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 03
  • DOI: 10.1088/1475-7516/2015/03/038

A tale of tails: Dark matter interpretations of the Fermi GeV excess in light of background model systematics
journal, March 2015


FERMI -LAT OBSERVATIONS OF HIGH-ENERGY γ -RAY EMISSION TOWARD THE GALACTIC CENTER
journal, February 2016


The consistency of Fermi-LAT observations of the galactic center with a millisecond pulsar population in the central stellar cluster
journal, March 2011


Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess
journal, February 2016


Evidence for Unresolved γ -Ray Point Sources in the Inner Galaxy
journal, February 2016


Galactic Center gamma-ray ``excess'' from an active past of the Galactic Centre?
journal, October 2014

  • Petrović, Jovana; Serpico, Pasquale Dario; Zaharijaš, Gabrijela
  • Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 10
  • DOI: 10.1088/1475-7516/2014/10/052

The Galactic Center GeV excess from a series of leptonic cosmic-ray outbursts
journal, December 2015

  • Cholis, Ilias; Evoli, Carmelo; Calore, Francesca
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12
  • DOI: 10.1088/1475-7516/2015/12/005

Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
journal, December 2015

  • Gaggero, Daniele; Taoso, Marco; Urbano, Alfredo
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12
  • DOI: 10.1088/1475-7516/2015/12/056

Dark matter annihilation rates with velocity-dependent annihilation cross sections
journal, April 2009


The impact of the phase-space density on the indirect detection of dark matter
journal, September 2013


Sommerfeld-enhanced J -factors for dwarf spheroidal galaxies
journal, June 2017


J -factors for self-interacting dark matter in 20 dwarf spheroidal galaxies
journal, August 2018


The Galaxy in Context: Structural, Kinematic, and Integrated Properties
journal, September 2016


Reconstructing WIMP properties in direct detection experiments including galactic dark matter distribution uncertainties
journal, November 2009


Taming astrophysical bias in direct dark matter searches
journal, February 2013

  • Pato, Miguel; Strigari, Louis E.; Trotta, Roberto
  • Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 02
  • DOI: 10.1088/1475-7516/2013/02/041

Matrix element analyses of dark matter scattering and annihilation
journal, July 2013


Scalar dark matter models with significant internal bremsstrahlung
journal, October 2013

  • Giacchino, Federica; Lopez-Honorez, Laura; Tytgat, Michel H. G.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 10
  • DOI: 10.1088/1475-7516/2013/10/025

A theory of dark matter
journal, January 2009

  • Arkani-Hamed, Nima; Finkbeiner, Douglas P.; Slatyer, Tracy R.
  • Physical Review D, Vol. 79, Issue 1
  • DOI: 10.1103/PhysRevD.79.015014

Selection Rule for Enhanced Dark Matter Annihilation
journal, June 2017


Dynamical constraints on the dark matter distribution in the Milky Way
journal, December 2015

  • Pato, Miguel; Iocco, Fabio; Bertone, Gianfranco
  • Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12
  • DOI: 10.1088/1475-7516/2015/12/001

Mass models of the Milky Way: Mass models of the Milky Way
journal, April 2011


The local dark matter density
journal, May 2014


Dark matter direct detection signals inferred from a cosmological N-body simulation with baryons
journal, February 2010

  • Ling, F. -S; Nezri, E.; Athanassoula, E.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 02
  • DOI: 10.1088/1475-7516/2010/02/012

Simulated Milky Way analogues: implications for dark matter direct searches
journal, May 2016

  • Bozorgnia, Nassim; Calore, Francesca; Schaller, Matthieu
  • Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 05
  • DOI: 10.1088/1475-7516/2016/05/024