期刊
PHYSICAL REVIEW D
卷 105, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.105.083006
关键词
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资金
- Atraccion de Talento - Comunidad de Madrid in Spain [2016-T1/TIC-1542, 2020-5A/TIC19725]
- MCIN/AEI [SEV-2016-059717-2, PGC2018-095161-B-I00, CEX2020-001007-S]
- ESF Investing in your future
- ERDF A way of making Europe
- Spanish Ministry of Science and Innovation [FPI-UAM 2018]
- National Aeronautics and Space Administration (NASA)
- Department of Energy in the United States
- Commissariat `a l'Energie Atomique
- Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France
- Agenzia Spaziale Italiana
- Istituto Nazionale di Fisica Nucleare in Italy
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- High Energy Accelerator Research Organization
- Japan Aerospace Exploration Agency (JAXA) in Japan
- K. A. Wallenberg Foundation
- Swedish Research Council
- Swedish National Space Board in Sweden
- Istituto Nazionale di Astrofisica in Italy
- Centre National d'Etudes Spatiales in France
Research shows that detecting and determining the clear signal of extended subhalos require a larger flux compared to point sources. By studying models with significant parameter variations, we obtained the response of LAT to the product of annihilation cross-section times the J factor. Spatial extension can be used as an additional "filter" to reject subhalo candidates among unidentified LAT sources.
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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