Is the gamma-ray source 3FGL J2212.5+0703 a dark matter subhalo?

Bertoni, Bridget; Hooper, Dan; Linden, Tim

doi:10.1088/1475-7516/2016/05/049

Title: Is the gamma-ray source 3FGL J2212.5+0703 a dark matter subhalo?

Journal Article · Mon May 23 00:00:00 EDT 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/05/049· OSTI ID:1254642

^[1]; Hooper, Dan ^[2]; Linden, Tim ^[3]

Univ. of Washington, Seattle, WA (United States); Stanford Univ., Stanford, CA (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
The Ohio State Univ., Columbus, OH (United States); Univ. of Chicago, Chicago, IL (United States)

In a previous study, we pointed out that the gamma-ray source 3FGL J2212.5+0703 shows evidence of being spatially extended. If a gamma-ray source without detectable emission at other wavelengths were unambiguously determined to be spatially extended, it could not be explained by known astrophysics, and would constitute a smoking gun for dark matter particles annihilating in a nearby subhalo. With this prospect in mind, we scrutinize the gamma-ray emission from this source, finding that it prefers a spatially extended profile over that of a single point-like source with 5.1σ statistical significance. We also use a large sample of active galactic nuclei and other known gamma-rays sources as a control group, confirming, as expected, that statistically significant extension is rare among such objects. We argue that the most likely (non-dark matter) explanation for this apparent extension is a pair of bright gamma-ray sources that serendipitously lie very close to each other, and estimate that there is a chance probability of ~2% that such a pair would exist somewhere on the sky. In the case of 3FGL J2212.5+0703, we test an alternative model that includes a second gamma-ray point source at the position of the radio source BZQ J2212+0646, and find that the addition of this source alongside a point source at the position of 3FGL J2212.5+0703 yields a fit of comparable quality to that obtained for a single extended source. If 3FGL J2212.5+0703 is a dark matter subhalo, it would imply that dark matter particles have a mass of ~18–33 GeV and an annihilation cross section on the order of σv ~ 10^–26 cm(3)/s (for the representative case of annihilations to $$b\bar{b}$$), similar to the values required to generate the Galactic Center gamma-ray excess.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1254642

Report Number(s):: FERMILAB-PUB-15-411-A; INT-PUB-16-005; arXiv:1602.07303; 1423260; TRN: US1601724

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 05; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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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
Halometry from Astrometry Van Tilburg, Ken; Taki, Anna-Maria; Weiner, Neal arXiv https://doi.org/10.48550/arxiv.1804.01991	text	January 2018
A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter Ciucă, Ioana; Kawata, Daisuke; Ando, Shin'ichiro arXiv https://doi.org/10.48550/arxiv.1805.02588	text	January 2018
Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope Coronado-Blazquez, Javier; Sanchez-Conde, Miguel A.; Dominguez, Alberto arXiv https://doi.org/10.48550/arxiv.1906.11896	text	January 2019
Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources Coronado-Blázquez, Javier; Sánchez-Conde, Miguel A.; Di Mauro, Mattia arXiv https://doi.org/10.48550/arxiv.1910.14429	text	January 2019
Constraints to dark matter annihilation from high-latitude HAWC unidentified sources Coronado-Blazquez, Javier; Sanchez-Conde, Miguel A. arXiv https://doi.org/10.48550/arxiv.2001.02536	text	January 2020

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