A Caltech Library Service

Dark-matter decays and Milky Way satellite galaxies

Peter, Annika H. G. and Benson, Andrew J. (2010) Dark-matter decays and Milky Way satellite galaxies. Physical Review D, 82 (12). Art. No. 123521. ISSN 2470-0010. doi:10.1103/PhysRevD.82.123521.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We consider constraints on a phenomenological dark-matter model consisting of two nearly degenerate particle species using observed properties of the Milky Way satellite galaxy population. The two parameters of this model, assuming the particle masses are ≳  GeV, are v_k, the recoil speed of the daughter particle, and τ, the lifetime of the parent particle. The satellite constraint that spans the widest range of v_k is the number of satellites that have a mass within 300 pc M_(300)>5×10^6M_⊙, although constraints based on M_300 in the classical dwarfs and the overall velocity function are competitive for vk≳50  km s^(-1). In general, we find that τ≲30   Gyr is ruled out for 20  km s^(-1)≲v_k≲200 km s^(-1), although we find that the limits on τ for fixed vk can change by a factor of ~3 depending on the star-formation histories of the satellites. We advocate using the distribution of M300 in Milky Way satellites, determined by next-generation all-sky surveys and follow-up spectroscopy, as a probe of dark-matter physics.

Item Type:Article
Related URLs:
URLURL TypeDescription
Peter, Annika H. G.0000-0002-8040-6785
Benson, Andrew J.0000-0001-5501-6008
Additional Information:© 2010 American Physical Society. Received 9 September 2010; published 21 December 2010. We thank Manoj Kaplinghat for the discussions that initiated this work, James Bullock and Joe Wolf for stimulating discussions, and Chris Moody and Marc Kamionkowski for some of the simulations used in this work. We are supported by the Gordon and Betty Moore Foundation.
Group:Moore Center for Theoretical Cosmology and Physics, Keck Institute for Space Studies
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:12
Classification Code:PACS: 95.35.+d, 98.56.Wm
Record Number:CaltechAUTHORS:20110307-112621455
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22694
Deposited On:08 Mar 2011 15:52
Last Modified:09 Nov 2021 16:07

Repository Staff Only: item control page