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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29329
Title: A Search for Cosmic-Ray Proton Anisotropy with the Fermi Large Area Telescope
Authors: Ajello, M.
Baldini, L.
Barbiellini, G.
Bastieri, D.
Bechtol, K.
Bellazzini, R.
Bissaldi, E.
Blandford, R. D.
Bonino, R.
Bottacini, E.
Brandt, T. J.
Bruel, P.
Buson, S.
Cameron, R. A.
Caputo, R.
Cavazzuti, E.
Chen, S.
Chiaro, G.
Ciprini, S.
Cohen-Tanugi, J.
Costantin, D.
Cuoco, A.
Cutini, S.
D'AMMANDO, FILIPPO 
de la Torre Luque, P.
de Palma, F.
Desai, A.
Digel, S. W.
Di Lalla, N.
Di Venere, L.
Domínguez, A.
Fegan, S. J.
Fukazawa, Y.
Funk, S.
Fusco, P.
Gargano, F.
Gasparrini, D.
Giglietto, N.
Giordano, F.
Giroletti, M.
Green, D.
Grenier, I. A.
Guiriec, S.
Hayashi, K.
Hays, E.
Hewitt, J. W.
Horan, D.
Jóhannesson, G.
Kuss, M.
Latronico, L.
Li, J.
Liodakis, I.
Longo, F.
Loparco, F.
Lubrano, P.
Maldera, S.
Manfreda, A.
Martí-Devesa, G.
Mazziotta, M. N.
Meehan, M.
Mereu, I.
Meyer, M.
Michelson, P. F.
Mirabal, N.
Mitthumsiri, W.
Mizuno, T.
Morselli, A.
Negro, M.
Nuss, E.
Omodei, N.
ORIENTI, Monica 
Orlando, E.
Paliya, V. S.
Paneque, D.
PERSIC, Massimo 
Pesce-Rollins, M.
Piron, F.
Porter, T. A.
Principe, G.
Rainò, S.
Rando, R.
Razzano, M.
Razzaque, S.
Reimer, A.
Reimer, O.
Serini, D.
Sgrò, C.
Siskind, E. J.
Spandre, G.
Spinelli, P.
Suson, D. J.
Tajima, H.
Thayer, J. B.
Torres, D. F.
Troja, E.
Vandenbroucke, J.
Yassine, M.
Zimmer, S.
Fermi-LAT Collaboration
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 883
Issue: 1
First Page: 33
Abstract: The Fermi Large Area Telescope (LAT) has amassed a large data set of primary cosmic-ray protons throughout its mission. In fact, it is the largest set of identified cosmic-ray protons ever collected at this energy. The LAT’s wide field of view and full-sky survey capabilities make it an excellent instrument for studying cosmic-ray anisotropy. As a space-based survey instrument, the LAT is sensitive to anisotropy in both R.A. and decl., while ground-based observations only measure the anisotropy in R.A. We present the results of the first-ever proton anisotropy search using Fermi LAT. The data set was collected over eight years and consists of approximately 179 million protons above 78 GeV, enabling it to probe dipole anisotropy below an amplitude of 10<SUP>-3</SUP>, resulting in the most stringent limits on the decl. dependence of the dipole to date. We measure a dipole amplitude δ = 3.9 ± 1.5 × 10<SUP>-4</SUP> with a p-value of 0.01 (pretrials) for protons with energy greater than 78 GeV. We discuss various systematic effects that could give rise to a dipole excess and calculate upper limits on the dipole amplitude as a function of minimum energy. The 95% confidence level upper limit on the dipole amplitude is δ <SUB>UL</SUB> = 1.3 × 10<SUP>-3</SUP> for protons with energy greater than 78 GeV and δ <SUB>UL</SUB> = 1.2 × 10<SUP>-3</SUP> for protons with energy greater than 251 GeV.
URI: http://hdl.handle.net/20.500.12386/29329
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab3a2e
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab3a2e
Bibcode ADS: 2019ApJ...883...33A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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