| Title: | Spatial extension of dark subhalos as seen by Fermi-LAT and the implications for WIMP constraints |
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| Authors: | Coronado-Blázquez, Javier (Author)
Sánchez-Conde, Miguel (Author)
Pérez-Romero, Judit (Author)
Aguirre-Santaella, Alejandra (Author) |
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| Files: | This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS.  |
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| Language: | English |
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| Work type: | Not categorized (r6) |
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| Tipology: | 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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| Year of publishing: | 2022 |
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| Number of pages: | 22 |
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| Numbering: | 105, 8 |
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| COBISS_ID: | 139643907 |
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| URN: | URN:SI:UNG:REP:SEYAJJTK |
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| DOI: | 10.1103/PhysRevD.105.083006 |
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| Views: | 214 |
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| Downloads: | 0 |
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| Metadata: |     |
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| Categories: | Document is not linked to any category. |
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