Effective J-factor of the Galactic Center for velocity-dependent dark matter annihilation

Boddy, Kimberly K.; Kumar, Jason; Strigari, Louis E.

doi:10.1103/PhysRevD.98.063012

Title: Effective $J$ -factor of the Galactic Center for velocity-dependent dark matter annihilation

Journal Article · Thu Sep 20 00:00:00 EDT 2018 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.98.063012· OSTI ID:1598042

Boddy, Kimberly K. ^[1]; Kumar, Jason ^[2]; Strigari, Louis E. ^[3]

Johns Hopkins Univ., Baltimore, MD (United States)
Univ. of Hawaii, Honolulu, HI (United States)
Texas A & M Univ., College Station, TX (United States)

Here, we introduce the effective $J$ -factors for the Milky Way for scenarios in which dark matter annihilation is $p$ -wave or $d$ -wave suppressed. We find that the velocity suppression of dark matter annihilation can have a sizable effect on the morphology of a potential dark matter annihilation signal in the Galactic Center. The gamma-ray flux from the innermost region of the Galactic Center is in particular suppressed. We discover that for dark matter density profiles with steep inner slopes, the morphology of the inner Galaxy gamma-ray emission in $p$ -wave models can be made similar to the morphology in standard $s$ -wave models. This similarity may suggest that model discrimination between $s$ wave and $p$ wave is challenging, e.g., when fitting the Galactic Center excess. However, we show that it is difficult to simultaneously match $s$ - and $p$ -wave morphologies at both large and small angular scales. The $J$ -factors we calculate may be implemented with astrophysical foreground models to self-consistently determine the morphology of the excess with velocity-suppressed dark matter annihilation.

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Research Organization:: Univ. of Hawaii, Honolulu, HI (United States); Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: SC0010504; PHY-1748958; PHY-1250573; SC0010813

OSTI ID:: 1598042

Alternate ID(s):: OSTI ID: 1471755

Journal Information:: Physical Review D, Vol. 98, Issue 6; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Two-integral distribution functions in axisymmetric galaxies: implications for dark matter searches Petac, Mihael; Ullio, Piero arXiv https://doi.org/10.48550/arxiv.1812.01531	text	January 2018

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