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Title: Indirect Dark Matter detection from Dwarf satellites: joint expectations from astrophysics and supersymmetry

Abstract

We present a general methodology for determining the gamma-ray flux from annihilation of dark matter particles in Milky Way satellite galaxies, focusing on two promising satellites as examples: Segue 1 and Draco. We use the SuperBayeS code to explore the best-fitting regions of the Constrained Minimal Supersymmetric Standard Model (CMSSM) parameter space, and an independent MCMC analysis of the dark matter halo properties of the satellites using published radial velocities. We present a formalism for determining the boost from halo substructure in these galaxies and show that its value depends strongly on the extrapolation of the concentration-mass (c(M)) relation for CDM subhalos down to the minimum possible mass. We show that the preferred region for this minimum halo mass within the CMSSM with neutralino dark matter is ∼ 10{sup −9}–10{sup −6} M{sub s}un. For the boost model where the observed power-law c(M) relation is extrapolated down to the minimum halo mass we find average boosts of about 20, while the Bullock et al (2001) c(M) model results in boosts of order unity. We estimate that for the power-law c(M) boost model and photon energies greater than a GeV, the Fermi space-telescope has about 20% chance of detecting a dark mattermore » annihilation signal from Draco with signal-to-noise greater than 3 after about 5 years of observation.« less

Authors:
; ;  [1];  [2];  [3]
  1. Center for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
  2. Kavli Institute for Particle Astrophysics and Cosmology, Physics Department, Stanford University, Stanford, CA 94305 (United States)
  3. Imperial College London, Astrophysics Group, Blackett Laboratory, Prince Consort Road, London SW7 2AZ (United Kingdom)
Publication Date:
OSTI Identifier:
22273143
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2009; Journal Issue: 06; 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; ANNIHILATION; ASTROPHYSICS; CONCENTRATION RATIO; COSMOLOGY; EXTRAPOLATION; GEV RANGE; MILKY WAY; NOISE; NONLUMINOUS MATTER; RADIAL VELOCITY; S CODES; STANDARD MODEL; SUPERSYMMETRY

Citation Formats

Martinez, Gregory D., Bullock, James S., Kaplinghat, Manoj, Strigari, Louis E., and Trotta, Roberto. Indirect Dark Matter detection from Dwarf satellites: joint expectations from astrophysics and supersymmetry. United States: N. p., 2009. Web. doi:10.1088/1475-7516/2009/06/014.
Martinez, Gregory D., Bullock, James S., Kaplinghat, Manoj, Strigari, Louis E., & Trotta, Roberto. Indirect Dark Matter detection from Dwarf satellites: joint expectations from astrophysics and supersymmetry. United States. https://doi.org/10.1088/1475-7516/2009/06/014
Martinez, Gregory D., Bullock, James S., Kaplinghat, Manoj, Strigari, Louis E., and Trotta, Roberto. Mon . "Indirect Dark Matter detection from Dwarf satellites: joint expectations from astrophysics and supersymmetry". United States. https://doi.org/10.1088/1475-7516/2009/06/014.
@article{osti_22273143,
title = {Indirect Dark Matter detection from Dwarf satellites: joint expectations from astrophysics and supersymmetry},
author = {Martinez, Gregory D. and Bullock, James S. and Kaplinghat, Manoj and Strigari, Louis E. and Trotta, Roberto},
abstractNote = {We present a general methodology for determining the gamma-ray flux from annihilation of dark matter particles in Milky Way satellite galaxies, focusing on two promising satellites as examples: Segue 1 and Draco. We use the SuperBayeS code to explore the best-fitting regions of the Constrained Minimal Supersymmetric Standard Model (CMSSM) parameter space, and an independent MCMC analysis of the dark matter halo properties of the satellites using published radial velocities. We present a formalism for determining the boost from halo substructure in these galaxies and show that its value depends strongly on the extrapolation of the concentration-mass (c(M)) relation for CDM subhalos down to the minimum possible mass. We show that the preferred region for this minimum halo mass within the CMSSM with neutralino dark matter is ∼ 10{sup −9}–10{sup −6} M{sub s}un. For the boost model where the observed power-law c(M) relation is extrapolated down to the minimum halo mass we find average boosts of about 20, while the Bullock et al (2001) c(M) model results in boosts of order unity. We estimate that for the power-law c(M) boost model and photon energies greater than a GeV, the Fermi space-telescope has about 20% chance of detecting a dark matter annihilation signal from Draco with signal-to-noise greater than 3 after about 5 years of observation.},
doi = {10.1088/1475-7516/2009/06/014},
url = {https://www.osti.gov/biblio/22273143}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 06,
volume = 2009,
place = {United States},
year = {2009},
month = {6}
}