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Search for Dark Matter Annihilation Signals from Unidentified Fermi-LAT Objects with H.E.S.S.

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dc.abstract.enCosmological N-body simulations show that Milky Way-sized galaxies harbor a population of unmerged dark matter (DM) subhalos. These subhalos could shine in gamma-rays and eventually be detected in gamma-ray surveys as unidentified sources. We performed a thorough selection among unidentified Fermi-Large Area Telescope Objects (UFOs) to identify them as possible tera-electron-volt-scale DM subhalo candidates. We search for very-high-energy (E ≳ 100 GeV) gamma-ray emissions using H.E.S.S. observations toward four selected UFOs. Since no significant very-high-energy gamma-ray emission is detected in any data set of the four observed UFOs or in the combined UFO data set, strong constraints are derived on the product of the velocity-weighted annihilation cross section ⟨σv⟩ by the J factor for the DM models. The 95% confidence level observed upper limits derived from combined H.E.S.S. observations reach ⟨σv⟩J values of 3.7 × 10<SUP>-5</SUP> and 8.1 × 10<SUP>-6</SUP> GeV<SUP>2 </SUP>cm<SUP>-2 </SUP>s<SUP>-1</SUP> in the W<SUP>+</SUP>W<SUP>-</SUP> and τ<SUP>+</SUP>τ<SUP>-</SUP> channels, respectively, for a 1 TeV DM mass. Focusing on thermal weakly interacting massive particles, the H.E.S.S. constraints restrict the J factors to lie in the range 6.1 × 10<SUP>19</SUP>-2.0 × 10<SUP>21</SUP> GeV<SUP>2 </SUP>cm<SUP>-5</SUP> and the masses to lie between 0.2 and 6 TeV in the W<SUP>+</SUP>W<SUP>-</SUP> channel. For the τ<SUP>+</SUP>τ<SUP>-</SUP> channel, the J factors lie in the range 7.0 × 10<SUP>19</SUP>-7.1 × 10<SUP>20</SUP> GeV<SUP>2 </SUP>cm<SUP>-5</SUP> and the masses lie between 0.2 and 0.5 TeV. Assuming model-dependent predictions from cosmological N-body simulations on the J-factor distribution for Milky Way-sized galaxies, the DM models with masses >0.3 TeV for the UFO emissions can be ruled out at high confidence level.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBulik, Tomasz
dc.contributor.authorAbdalla, H.
dc.contributor.authorAharonian, F.
dc.contributor.authorBenkhali, F. Ait
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dc.contributor.authorTsirou, M.
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dc.contributor.authorWalt, D. J. van der
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dc.contributor.authorVasileiadis, G.
dc.contributor.authorVeh, J.
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dc.contributor.authorVincent, P.
dc.contributor.authorViana, A.
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dc.contributor.authorVölk, H. J.
dc.contributor.authorWagner, S. J.
dc.contributor.authorWerner, F.
dc.contributor.authorWhite, R.
dc.contributor.authorWierzcholska, A.
dc.contributor.authorWong, Yu Wun
dc.contributor.authorYassin, H.
dc.contributor.authorYusafzai, A.
dc.contributor.authorZacharias, M.
dc.contributor.authorZanin, R.
dc.contributor.authorZargaryan, D.
dc.contributor.authorZdziarski, A. A.
dc.contributor.authorZech, A.
dc.contributor.authorZhu, S. J.
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dc.contributor.authorŻywucka, N.
dc.date.accessioned2024-01-25T21:59:43Z
dc.date.available2024-01-25T21:59:43Z
dc.date.copyright2021-07-15
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume918
dc.identifier.doi10.3847/1538-4357/ABFF59
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/119196
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021ApJ...918...17A
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages17
dc.rightsOther
dc.sciencecloudnosend
dc.titleSearch for Dark Matter Annihilation Signals from Unidentified Fermi-LAT Objects with H.E.S.S.
dc.typeJournalArticle
dspace.entity.typePublication