期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 221, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/221/2/29
关键词
cosmology: observations; cosmology: theory; dark matter; gamma-rays: diffuse backgrounds; large-scale structure of universe
资金
- Theoretical Astroparticle Physics - Ministero dell'Istruzione, Universita e della Ricerca (MIUR) [2012CPPYP7]
- TAsP (Theoretical Astroparticle Physics)
- Istituto Nazionale di Fisica Nucleare (INFN)
- Origin and Detection of Galactic and Extragalactic Cosmic Rays - Torino University and Compagnia di San Paolo
- PRIN MIUR
- IS PD51 INDARK grants
- ERC-StG cosmoIGM, PRIN INAF
- National Youth Thousand Talents Program
- National Science Foundation of China [11422323]
- Strategic Priority Research Program
- Emergence of Cosmological Structures of the Chinese Academy of Sciences [XDB09000000]
We compare the measured angular cross-correlation between the Fermi-Large Area Telescope gamma-ray sky and catalogs of extragalactic objects with the expected signal induced by weakly interacting massive particle (WIMP) dark matter (DM). We include a detailed description of the contribution of astrophysical gamma-ray emitters such as blazars, misaligned active galactic nucleus (AGN), and star-forming galaxies, and perform a global fit to the measured cross-correlation. Five catalogs are considered: Sloan Digital Sky Survey (SDSS)-DR6 quasars, Two Micron All Sky Survey galaxies, NRAO VLA Sky Survey radio galaxies, SDSS-DR8 Luminous Red Galaxies, and the SDSS-DR8 main galaxy sample. To model the cross-correlation signal, we use the halo occupation distribution formalism to estimate the number of galaxies of a given catalog in DM halos and their spatial correlation properties. We discuss uncertainties in the predicted cross-correlation signal arising from the DM clustering and WIMP microscopic properties, which set the DM gamma-ray emission. The use of different catalogs probing objects at different redshifts significantly. reduces, though not completely, the degeneracy among the different.-ray components. We find that the presence of a significant WIMP DM signal is allowed by the data but not significantly preferred by the fit, although this is mainly due to a degeneracy with the misaligned AGN component. With modest substructure boost, the sensitivity of this method excludes thermal annihilation cross sections at 95% level for WIMP masses up to few tens of GeV. Constraining the low-redshift properties of astrophysical populations with future data will further improve the sensitivity to DM.
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