July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Dark matter annihilation and decay factors in the Milky Way's dwarf spheroidal galaxies

Aug 1, 2015, 2:15 PM
15m
Yangtze 2 (World Forum)

Yangtze 2

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution DM-TH Parallel DM03

Speaker

Vincent Bonnivard (Centre National de la Recherche Scientifique (FR))

Description

Self-annihilation or decay of dark matter (DM) particles could produce high-energy gamma-rays. Owing to their proximity, high DM content, and lack of astrophysical background, dwarf spheroidal galaxies (dSphs) of the Milky Way are among the best targets for current and future gamma-ray instruments. Putting constraints on the DM particle properties requires a precise knowledge of their "astrophysical" factors, hence on their DM content. Here, the latter is reconstructed using their stellar kinematic data through the Jeans analysis. Using large sets of mock data, we have identified several biases in the Jeans analysis and proposed an optimal setup in order to mitigate them. Using this optimal setup, we present a new estimation of the astrophysical factors for twenty-one dSphs. Our robust analysis gives the most realistic estimation of the uncertainties on these factors to date. We discuss the ranking of the dSphs according to the potential they present for annihilating and decaying DM indirect detection. We also show that Segue 1, often considered as one of the best target for DM indirect detection, has a highly uncertain astrophysical factor due to probable Milky Way foreground contamination.
Registration number following "ICRC2015-I/" 294
Collaboration -- not specified --

Primary author

Vincent Bonnivard (Centre National de la Recherche Scientifique (FR))

Co-authors

Céline Combet (LPSC/CNRS) David Alain Maurin (Centre National de la Recherche Scientifique (FR)) Matthew Walker (McWilliams Center for Cosmology)

Presentation materials