The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST

Kuhlen, Michael; Diemand, Jürg; Madau, Piero

doi:10.1086/590337

Title: The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST

Journal Article · Fri Oct 10 00:00:00 EDT 2008 · The Astrophysical Journal

DOI:https://doi.org/10.1086/590337· OSTI ID:1564656

Kuhlen, Michael ^[1]; Diemand, Jürg ^[2]; Madau, Piero ^[2]

Inst. for Advanced Study, Princeton, NJ (United States)
Univ. of California, Santa Cruz, CA (United States)

In this article, we present quantitative predictions for the detectability of individual Galactic dark matter subhalos in gamma rays from dark matter pair annihilations in their centers. Our method is based on a hybrid approach, employing the highest resolution numerical simulations available (including the recently completed 1 billion particle Via Lactea II simulation), as well as analytical models, for extrapolating beyond the simulations' resolution limit. We include a self-consistent treatment of subhalo boost factors, motivated by our numerical results, and a realistic treatment of the expected backgrounds that individual subhalos must outshine. We show that for reasonable values of the dark matter particle physics parameters (M_χ ~ 50-500 GeV and $$\langle$$ σv $$\rangle$$ ~ 10^-26-10^-25 cm³ s^-1) GLAST may very well discover a few, even up to several dozen, such subhalos at 5 σ significance, and some at more than 20 σ. We predict that the majority of luminous sources would be resolved with GLAST's expected angular resolution. For most observer locations, the angular distribution of detectable subhalos is consistent with a uniform distribution across the sky. The brightest subhalos tend to be massive (median V_max of 24 km s^-1) and therefore likely hosts of dwarf galaxies, but many subhalos with V_max-1 are also visible. Typically detectable subhalos are 20-40 kpc from the observer, and only a small fraction are closer than 10 kpc. The total number of observable subhalos has not yet converged in our simulations, and we estimate that we may be missing up to 3/4 of all detectable subhalos.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1564656

Journal Information:: The Astrophysical Journal, Vol. 686, Issue 1; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 144 works

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The impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies: Impact of cusps and cores on the satellite population Peñarrubia, Jorge; Benson, Andrew J.; Walker, Matthew G. Monthly Notices of the Royal Astronomical Society https://doi.org/10.1111/j.1365-2966.2010.16762.x	journal	May 2010
Dark matter profiles and annihilation in dwarf spheroidal galaxies: prospectives for present and future γ-ray observatories - I. The classical dwarf spheroidal galaxies: γ-ray from dark matter annihilation in dSphs Charbonnier, A.; Combet, C.; Daniel, M. Monthly Notices of the Royal Astronomical Society, Vol. 418, Issue 3 https://doi.org/10.1111/j.1365-2966.2011.19387.x	journal	November 2011
The Phoenix Project: the dark side of rich Galaxy clusters: The Phoenix project Gao, L.; Navarro, J. F.; Frenk, C. S. Monthly Notices of the Royal Astronomical Society, Vol. 425, Issue 3 https://doi.org/10.1111/j.1365-2966.2012.21564.x	journal	August 2012
Identifying Local Group field galaxies that have interacted with the Milky Way: Local Group field galaxies and the Milky Way Teyssier, Maureen; Johnston, Kathryn V.; Kuhlen, Michael Monthly Notices of the Royal Astronomical Society, Vol. 426, Issue 3 https://doi.org/10.1111/j.1365-2966.2012.21793.x	journal	October 2012
An interpretation of the cosmic ray e+ + e− spectrum from 10GeV to 3TeV measured by CALET on the ISS Bhattacharyya, Saptashwa; Motz, Holger; Asaoka, Yoichi International Journal of Modern Physics D, Vol. 28, Issue 02 https://doi.org/10.1142/s0218271819500354	journal	January 2019
Dark matter profiles and annihilation in dwarf spheroidal galaxies: prospectives for present and future γ-ray observatories – I. The classical dwarf spheroidal galaxies Charbonnier, Ald́ee; Combet, Céline; Daniel, Michael ETH Zurich https://doi.org/10.3929/ethz-b-000044113	text	January 2011
Fermi-LAT Sensitivity to Dark Matter Annihilation in Via Lactea II Substructure Anderson, B.; Kuhlen, M.; Diemand, J. Institute of Physics Publishing https://doi.org/10.5167/uzh-41660	text	January 2010
Density profiles of CDM microhalos and their implications for annihilation boost factors Anderhalden, Donnino; Diemand, Juerg IOP Publishing https://doi.org/10.5167/uzh-90651	text	January 2013
The impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies Penarrubia, J.; Benson, A. J.; Walker, M. G. Wiley-Blackwell https://doi.org/10.5167/uzh-41698	text	January 2010
A Complete Spectroscopic Survey of the Milky Way Satellite Segue 1: The Darkest Galaxy Simon, Joshua D.; Geha, Marla; Minor, Quinn E. arXiv https://doi.org/10.48550/arxiv.1007.4198	text	January 2010
Dark matter subhaloes as gamma-ray sources and candidates in the first Fermi-LAT catalogue Zechlin, H. -S.; Fernandes, M. V.; Elsaesser, D. arXiv https://doi.org/10.48550/arxiv.1111.3514	text	January 2011
Search for Dark Matter Satellites using the FERMI-LAT Collaboration, The Fermi LAT; Ackermann, M.; Albert, A. arXiv https://doi.org/10.48550/arxiv.1201.2691	text	January 2012
Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays Murase, Kohta; Beacom, John F. arXiv https://doi.org/10.48550/arxiv.1206.2595	text	January 2012
Bounds on Dark Matter Interactions with Electroweak Gauge Bosons Cotta, R. C.; Hewett, J. L.; Le, M. P. arXiv https://doi.org/10.48550/arxiv.1210.0525	text	January 2012
Dark matter and cosmic structure Frenk, Carlos S.; White, Simon D. M. arXiv https://doi.org/10.48550/arxiv.1210.0544	text	January 2012
Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos Zechlin, Hannes-S.; Horns, Dieter arXiv https://doi.org/10.48550/arxiv.1210.3852	text	January 2012
The Cosmic Evolution of Faint Satellite Galaxies as a Test of Galaxy Formation and the Nature of Dark Matter Nierenberg, A. M.; Treu, T.; Menci, N. arXiv https://doi.org/10.48550/arxiv.1302.3243	text	January 2013
Is The Gamma-Ray Source 3FGL J2212.5+0703 A Dark Matter Subhalo? Bertoni, Bridget; Hooper, Dan; Linden, Tim arXiv https://doi.org/10.48550/arxiv.1602.07303	text	January 2016
The 21 cm signal and the interplay between dark matter annihilations and astrophysical processes Lopez-Honorez, Laura; Mena, Olga; Moliné, Ángeles arXiv https://doi.org/10.48550/arxiv.1603.06795	text	January 2016
Gamma Rays From Dark Matter Subhalos Revisited: Refining the Predictions and Constraints Hooper, Dan; Witte, Samuel J. arXiv https://doi.org/10.48550/arxiv.1610.07587	text	January 2016
Disruption of Dark Matter Substructure: Fact or Fiction? Bosch, Frank C. van den; Ogiya, Go; Hahn, Oliver arXiv https://doi.org/10.48550/arxiv.1711.05276	text	January 2017

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