Abdollahi S, Acero F, Ackermann M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Berenji B, Berretta A, Bissaldi E, Blandford RD, Bonino R, Bruel P, Buson S, Cameron RA, Caputo R, Caraveo PA, Castro D, Chiaro G, Cibrario N, Ciprini S, Coronado-Blazquez J, Crnogorcevic M, Cutini S, D'Ammando F, De Gaetano S, Di Lalla N, Dirirsa F, Di Venere L, Dominguez A, Fegan SJ, Fiori A, Fleischhack H, Franckowiak A, Fukazawa Y, Fusco P, Gammaldi , Gargano F, Gasparrini D, Giacchino F, Giglietto N, Giordano F, Giroletti M, Glanzman T, Green D, Grenier IA, Grondin MH, Guiriec S, Gustafsson M, Harding AK, Hays E, Hewitt JW, Horan D, Hou X, Johannesson G, Kayanoki T, Kerr M, Kuss M, Larsson S, Latronico L, Lemoine-Goumard M, Li J, Longo F, Loparco F, Lubrano P, Maldera S, Malyshev D, Manfreda A, Martí-Devesa G, Mazziotta MN, Mereu , Michelson PF, Mirabal N, Mitthumsiri W, Mizuno T, Monzani ME, Morselli A, Moskalenko I, Nuss E, Omodei N, Orienti M, Orlando E, Ormes JF, Paneque D, Pei Z, Persic M, Pesce-Rollins M, Pillera R, Poon H, Porter TA, Principe G, Raino S, Rando R, Rani B, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Sanchez-Conde M, Parkinson PMS, Scotton L, Serini D, Sgro C, Siskind EJ, Spandre G, Spinelli P, Sueoka K, Suson DJ, Tajima H, Tak D, Thayer JB, Torres DF, Troja E, Valverde J, Wadiasingh Z, Wood K, Zaharijas G (2022)
Publication Type: Journal article
Publication year: 2022
Book Volume: 933
Journal Issue: 2
Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma-rays. This offers a compelling way to identify the acceleration sites of protons. A characteristic hadronic spectrum, with a low-energy break around 200 MeV, was detected in the gamma-ray spectra of four supernova remnants (SNRs), IC 443, W44, W49B, and W51C, with the Fermi Large Area Telescope. This detection provided direct evidence that cosmic-ray protons are (re-)accelerated in SNRs. Here, we present a comprehensive search for low-energy spectral breaks among 311 4FGL catalog sources located within 5 degrees from the Galactic plane. Using 8 yr of data from the Fermi Large Area Telescope between 50 MeV and 1 GeV, we find and present the spectral characteristics of 56 sources with a spectral break confirmed by a thorough study of systematic uncertainty. Our population of sources includes 13 SNRs for which the proton-proton interaction is enhanced by the dense target material; the high-mass gamma-ray binary LS I+61 303; the colliding wind binary eta Carinae; and the Cygnus star-forming region. This analysis better constrains the origin of the gamma-ray emission and enlarges our view to potential new cosmic-ray acceleration sites.
APA:
Abdollahi, S., Acero, F., Ackermann, M., Baldini, L., Ballet, J., Barbiellini, G.,... Zaharijas, G. (2022). Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources. Astrophysical Journal, 933(2). https://doi.org/10.3847/1538-4357/ac704f
MLA:
Abdollahi, S., et al. "Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources." Astrophysical Journal 933.2 (2022).
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