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2021ApJ...918...17A - Astrophys. J., 918, 17-17 (2021/September-1)

Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.

ABDALLA H., AHARONIAN F., AIT BENKHALI F., ANGUNER E.O., ARCARO C., ARMAND C., ARMSTRONG T., ASHKAR H., BACKES M., BAGHMANYAN V., BARBOSA-MARTINS V., BARNACKA A., BARNARD M., BECHERINI Y., BERGE D., BERNLOHR K., BI B., BOTTCHER M., BOISSON C., BOLMONT J., DE BONY DE LAVERGNE M., BREUHAUS M., BROSE R., BRUN F., BULIK T., BYLUND T., CANGEMI F., CAROFF S., CASANOVA S., CHAMBERY P., CATALANO J., CHAND T., CHEN A., COTTER G., CURYLO M., DALGLEISH H., DAMASCENE MBARUBUCYEYE J., DAVIDS I.D., DAVIES J., DEVIN J., DJANNATI-ATAI A., DMYTRIIEV A., DONATH A., DOROSHENKO V., DREYER L., DU PLESSIS L., DUFFY C., EGBERTS K., EINECKE S., EMERY G., ERNENWEIN J.-P., FEIJEN K., FEGAN S., FIASSON A., FICHET DE CLAIRFONTAINE G., FONTAINE G., FUNK S., FUSSLING M., GABICI S., GALLANT Y.A., GHAFOURIZADE S., GIAVITTO G., GIUNTI L., GLAWION D., GLICENSTEIN J.F., GRONDIN M.-H., HATTINGH S., HAUPT M., HERMANN G., HINTON J.A., HOFMANN W., HOISCHEN C., HOLCH T.L., HOLLER M., HORBE M., HORNS D., HUANG Z., HUBER D., JAMROZY M., JANKOWSKY D., JANKOWSKY F., JOSHI V., JUNG-RICHARDT I., KASAI E., KATARZYNSKI K., KATZ U., KHANGULYAN D., KHELIFI B., KLEPSER S., KLUZNIAK W., KOMIN N., KONNO R., KOSACK K., KOSTUNIN D., KRETER M., KUKEC MEZEK G., KUNDU A., LAMANNA G., LE STUM S., LEMIERE A., LEMOINE-GOUMARD M., LENAIN J.-P., LEUSCHNER F., LEVY C., LUASHVILI A., LOHSE T., LYPOVA I., MACKEY J., MAJUMDAR J., MALYSHEV D., MALYSHEV D., MARANDON V., MARCHEGIANI P., MARCOWITH A., MARES A., MARTI-DEVESA G., MARX R., MAURIN G., MEINTJES P.J., MEYER M., MITCHELL A., MODERSKI R., MOHRMANN L., MONTANARI A., MOORE C., MORRIS P., MOULIN E., MULLER J., MURACH T., NAKASHIMA K., NAYERHODA A., DE NAUROIS M., NDIYAVALA H., NIEMIEC J., NOEL A., OBERHOLZER L., O'BRIEN P., OHM S., OLIVERA-NIETO L., DE ONA WILHELMI E., OSTROWSKI M., PANTER M., PANNY S., PARSONS R.D., PERON G., PITA S., POIREAU V., PROKHOROV D.A., PROKOPH H., PUHLHOFER G., PUNCH M., QUIRRENBACH A., REICHHERZER P., REIMER A., REIMER O., REMY Q., RENAUD M., RIEGER F., ROMOLI C., ROWELL G., RUDAK B., RUEDA RICARTE H., RUIZ-VELASCO E., SAHAKIAN V., SAILER S., SALZMANN H., SANCHEZ D.A., SANTANGELO A., SASAKI M., SCHAFER J., SCHUSSLER F., SCHUTTE H.M., SCHWANKE U., SENNIAPPAN M., SEYFFERT A.S., SHAPOPI J.N.S., SHININGAYAMWE K., SIMONI R., SINHA A., SPACKMAN H., SOL H., SPECOVIUS A., SPENCER S., SPIR-JACOB M., STAWARZ L., SUN L., STEENKAMP R., STEGMANN C., STEINMASSL S., STEPPA C., TAKAHASHI T., TANAKA T., TAVERNIER T., TAYLOR A.M., TERRIER R., THORPE-MORGAN C., THIERSEN J.H.E., TLUCZYKONT M., TOMANKOVA L., TSIROU M., TSUJI M., TUFFS R., UCHIYAMA Y., VAN DER WALT D.J., VAN ELDIK C., VAN RENSBURG C., VAN SOELEN B., VASILEIADIS G., VEH J., VENTER C., VINCENT P., VIANA A., VINK J., VOLK H.J., WAGNER S.J., WERNER F., WHITE R., WIERZCHOLSKA A., WONG Y.W., YASSIN H., YUSAFZAI A., ZACHARIAS M., ZANIN R., ZARGARYAN D., ZDZIARSKI A.A., ZECH A., ZHU S.J., ZMIJA A., ZORN J., ZOUARI S., ZYWUCKA N. (The HESS Collaboration)

Abstract (from CDS):

Cosmological 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 x 10–5 and 8.1 x 10–6 GeV2 cm–2 s–1 in the W+W– and τ+τ– 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 x 1019-2.0 x 1021 GeV2 cm–5 and the masses to lie between 0.2 and 6 TeV in the W+W– channel. For the τ+τ– channel, the J factors lie in the range 7.0 x 1019-7.1 x 1020 GeV2 cm–5 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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dark matter - High energy astrophysics - Gamma-ray sources - Gamma-ray telescopes

Simbad objects: 5

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