Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background

Ackermann M, Ajello M, Albert A, Baldini L, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bissaldi E, Bloom ED, Bonino R, Bregeon J, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cuoco A, Cutini S, D'Ammando F, De Angelis A, De Palma F, Dermer CD, Digel SW, Drell PS, Drlica-Wagner A, Favuzzi C, Ferrara EC, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Godfrey G, Guiriec S, Gustafsson M, Hewitt JW, Hou X, Kamae T, Kuss M, Larsson S, Latronico L, Longo F, Loparco F, Lovellette MN, Lubrano P, Malyshev D, Massaro F, Mayer M, Mazziotta MN, Michelson PF, Mitthumsiri W, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Negro M, Nemmen R, Nuss E, Ohsugi T, Orienti M, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Sanchez-Conde M, Schulz A, Sgro C, Siskind EJ, Spandre G, Spinelli P, Strong AW, Suson DJ, Tajima H, Takahashi HH, Thayer JG, Thayer JB, Tibaldo L, Tinivella M, Torres DF, Troja E, Uchiyama Y, Vianello G, Werner M, Winer BL, Wood KS, Wood M, Zaharijas G (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Journal Issue: 9

DOI: 10.1088/1475-7516/2015/09/008

Abstract

We search for evidence of dark matter (DM) annihilation in the isotropic gamma-ray background (IGRB) measured with 50 months of Fermi Large Area Telescope (LAT) observations. An improved theoretical description of the cosmological DM annihilation signal, based on two complementary techniques and assuming generic weakly interacting massive particle (WIMP) properties, renders more precise predictions compared to previous work. More specifically, we estimate the cosmologically-induced gamma-ray intensity to have an uncertainty of a factor similar to 20 in canonical setups. We consistently include both the Galactic and extragalactic signals under the same theoretical framework, and study the impact of the former on the IGRB spectrum derivation. We find no evidence for a DM signal and we set limits on the DM-induced isotropic gamma-ray signal. Our limits are competitive for DM particle masses up to tens of TeV and, indeed, are the strongest limits derived from Fermi LAT data at TeV energies. This is possible thanks to the new Fermi LAT IGRB measurement, which now extends up to an energy of 820 GeV. We quantify uncertainties in detail and show the potential this type of search offers for testing the WIMP paradigm with a complementary and truly cosmological probe of DM particle signals.

Authors with CRIS profile

Involved external institutions

Deutsches Elektronen-Synchrotron DESY Germany (DE) Clemson University United States (USA) (US) Stanford University United States (USA) (US) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) University of Chicago United States (USA) (US) University of Montpellier / Université Montpellier France (FR) École Polytechnique - Université Paris-Saclay France (FR) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) George Mason University United States (USA) (US) University of Padua / Universita degli Studi di Padova Italy (IT) Italian Space Agency / Agenzia Spaziale Italiana (ASI) Italy (IT) Stockholm University / Stockholms universitet Sweden (SE) University of Udine / Università degli Studi di Udine Italy (IT) U.S. Naval Research Laboratory United States (USA) (US) Fermi National Accelerator Laboratory (Fermilab) United States (USA) (US) National Aeronautics and Space Administration (NASA) United States (USA) (US) Hiroshima University Japan (JP) Université libre de Bruxelles (ULB) / Free University of Brussels Belgium (BE) Université Bordeaux 1, Sciences et Technologies France (FR) Yale University United States (USA) (US) Mahidol University / มหาวิทยาลัยมหิดล Thailand (TH) University of California Irvine United States (USA) (US) University of São Paulo / Universidade de São Paulo (USP) Brazil (BR) University of Denver United States (USA) (US) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) Purdue University Northwest / Purdue University Calumet United States (USA) (US) Institut d'Estudis Espacials de Catalunya (IEEC) Spain (ES) Leopold-Franzens-Universität Innsbruck / University of Innsbruck Austria (AT) Ohio State University United States (USA) (US) NYCB Real-Time Computing, Inc. United States (USA) (US)

How to cite

APA:

Ackermann, M., Ajello, M., Albert, A., Baldini, L., Barbiellini, G., Bastieri, D.,... Zaharijas, G. (2015). Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background. Journal of Cosmology and Astroparticle Physics, 9. https://dx.doi.org/10.1088/1475-7516/2015/09/008

MLA:

Ackermann, Markus, et al. "Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background." Journal of Cosmology and Astroparticle Physics 9 (2015).

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