Mapping extragalactic dark matter annihilation with galaxy surveys: A systematic study of stacked group searches
Name
PhysRevD.97.063005.pdf
Size
1.91 MB
Format
Adobe PDF
Checksum (MD5)
fd644ace5a49a5764fa0a7ff56186916
Author(s)
Lisanti, Mariangela
Mishra-Sharma, Siddharth
Wechsler, Risa H.
Rodd, Nicholas Llewellyn
Safdi, Benjamin Ryan
Date Issued
March 2018
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lisanti, Mariangela et al. "Mapping extragalactic dark matter annihilation with galaxy surveys: A systematic study of stacked group searches." Physical Review D 97, 6 (March 2018): 063005 © 2018 American Physical Society
Version
Final published version
Abstract
Dark matter in the halos surrounding galaxy groups and clusters can annihilate to high-energy photons. Recent advancements in the construction of galaxy group catalogs provide many thousands of potential extragalactic targets for dark matter. In this paper, we outline a procedure to infer the dark matter signal associated with a given galaxy group. Applying this procedure to a catalog of sources, one can create a full-sky map of the brightest extragalactic dark matter targets in the nearby Universe (z≲0.03), supplementing sources of dark matter annihilation from within the local group. As with searches for dark matter in dwarf galaxies, these extragalactic targets can be stacked together to enhance the signals associated with dark matter. We validate this procedure on mock Fermi gamma-ray data sets using a galaxy catalog constructed from the DarkSky N-body cosmological simulation and demonstrate that the limits are robust, at O(1) levels, to systematic uncertainties on halo mass and concentration. We also quantify other sources of systematic uncertainty arising from the analysis and modeling assumptions. Our results suggest that a stacking analysis using galaxy group catalogs provides a powerful opportunity to discover extragalactic dark matter and complements existing studies of Milky Way dwarf galaxies.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.97.063005
