| Title: | Spatial extension of dark subhalos as seen by Fermi-LAT and the implications for WIMP constraints |
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| Authors: | ID Coronado-Blázquez, Javier, IFT UAM-CSIC (Author)
ID Sánchez-Conde, Miguel, IFT UAM-CSIC (Author)
ID Pérez Romero, Judit, IFT UAM-CSIC (Author)
ID Aguirre-Santaella, Alejandra, IFT UAM-CSIC (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | 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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| Keywords: | dark matter, cosmic rays and astroparticles, gamma-ray astronomy, particle astrophysics, particle dark matter |
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| Publication version: | Version of Record |
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| Year of publishing: | 2022 |
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| Number of pages: | 22 |
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| Numbering: | 8, 105 |
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| PID: | 20.500.12556/RUNG-7899 |
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| COBISS.SI-ID: | 139643907 |
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| DOI: | 10.1103/PhysRevD.105.083006 |
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| NUK URN: | URN:SI:UNG:REP:SEYAJJTK |
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| Publication date in RUNG: | 26.01.2023 |
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| Views: | 1245 |
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| Downloads: | 0 |
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