Characterizing the local gamma-ray Universe via angular cross-correlations

Ammazzalorso, Simone; Fornengo, Nicolao; Horiuchi, Shunsaku; Regis, Marco

doi:10.1103/physrevd.98.103007

Title: Characterizing the local gamma-ray Universe via angular cross-correlations

Journal Article · 08 November 2018 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.98.103007 · OSTI ID:1612935

Ammazzalorso, Simone ^[1]; Fornengo, Nicolao ^[2]; Horiuchi, Shunsaku ^[3]; Regis, Marco ^[2]

Univ. di Torino (Italy); Sezione di Torino, Torino (Italy); DOE/OSTI
Univ. di Torino (Italy); Sezione di Torino, Torino (Italy)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

With a decade of γ-ray data from the Fermi-LAT telescope, we can now hope to answer how well we understand the local Universe at γ-ray frequencies. On the other hand, with γ-ray data alone it is not possible to directly access the distance of the emission and to point out the origin of unresolved sources. Here, this obstacle can be overcome by cross-correlating the γ-ray data with catalogs of objects with well-determined redshifts and positions. In this work, we cross-correlate Fermi-LAT skymaps with the 2MPZ catalog to study the local z < 0.2 γ-ray Universe, where about 10% of the total unresolved γ-ray background is produced. We find the signal to be dominated by AGN emissions, while star forming galaxies provide a subdominant contribution. Possible hints for a particle DM signal are discussed.

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Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0018327

OSTI ID:: 1612935

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 10 Vol. 98; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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