Spatial extension of dark subhalos as seen by Fermi-LAT and the implications for WIMP constraints
Entity
UAM. Departamento de Física TeóricaPublisher
American Physical SocietyDate
2022-04-14Citation
10.1103/PhysRevD.105.083006
Physical Review D 105.8 (2022): 083006
ISSN
2470-0010 (print); 2470-0029 (online)DOI
10.1103/PhysRevD.105.083006Project
Gobierno de España. PGC2018-095161-B-I00; Gobierno de España. SEV-2016-0597; Gobierno de España. CEX2020-001007-SEditor's Version
https://doi.org/10.1103/PhysRevD.105.083006Subjects
Cosmos; Dark Matter; Antiprotons; FísicaRights
© 2022 American Physical SocietyAbstract
Spatial extension has been hailed as a "smoking gun"in the gamma-ray search of dark galactic subhalos, which would appear as unidentified sources for gamma-ray telescopes. In this work, we study the sensitivity of the Fermi-LAT to extended subhalos using simulated data based on a realistic sky model. We simulate spatial templates for a set of representative subhalos, whose parameters were derived from our previous work with N-body cosmological simulation data. We find that detecting an extended subhalo and finding an unequivocal signal of angular extension requires, respectively, a flux 2 to 10 times larger than in the case of a pointlike source. By studying a large grid of models, where parameters such as the WIMP mass, annihilation channel, or subhalo model are varied significantly, we obtain the response of the LAT as a function of the product of annihilation cross-section times the J factor. Indeed, we show that spatial extension can be used as an additional "filter"to reject subhalos candidates among the pool of unidentified LAT sources, as well as a smoking gun for positive identification. For instance, typical angular extensions of a few tenths of a degree are expected for the considered scenarios. Finally, we also study the impact of the obtained LAT sensitivity to such extended subhalos on the achievable dark matter constraints, which are a few times less constraining than comparable point-source limits
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Google Scholar:Coronado-Blázquez, Javier
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Sánchez Conde, Miguel Ángel
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Pérez Romero, Judit
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Aguirre Santaella, Alejandra
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