Discovery of TeV gamma-ray emission from the neighbourhood of the supernova remnant G24.7+0.6 by MAGIC
Acciari VA; Ansoldi S; Antonelli LA; Engels AA; Arcaro C; Baack D; Babic A; Banerjee B; Bangale P; de Almeida UB; Barrio JA; Gonzalez JB; Bednarek W; Bernardini E; Berti A; Besenrieder J; Bhattacharyya W; Bigongiari C; Biland A; Blanch O; Bonnoli G; Carosi R; Ceribella G; Chatterjee A; Colak SM; Colin P; Colombo E; Contreras JL; Cortina J; Covino S; Cumani P; D'Elia V; Vela P; Dazzi F; Angelis A; Lotto B; Delfino M; Delgado J; Pierro F; Dominguez A; Prester DD; Dorner D; Doro M; Einecke S; Elsaesser D; Ramazani VF; Fattorini A; Fernandez-Barral A; Ferrara G; Fidalgo D; Foffano L; Fonseca MV; Font L; Fruck C; Galindo D; Gallozzi S; Lopez RJ; Garczarczyk M; Gaug M; Giammaria P; Godinovic N; Guberman D; Hadasch D; Hahn A; Hassan T; Herrera J; Hoang J; Hrupec D; Inoue S; Ishio K; Iwamura Y; Kubo H; Kushida J; Kuvezdic D; Lamastra A; Lelas D; Leone F; Lindfors E; Lombardi S; Longo F; Lopez M; Lopez-Oramas A; Maggio C; Majumdar P; Makariev M; Maneva G; Manganaro M; Mannheim K; Maraschi L; Mariotti M; Martinez M; Masuda S; Mazin D; Minev M; Miranda JM; Mirzoyan R; Molina E; Moralejo A; Moreno V; Moretti E; Neustroev V; Niedzwiecki A; Rosillo M; Nigro C; Nilsson K; Ninci D; Nishijima K; Noda K; Nogues L; Paiano S; Palacio J; Paneque D; Paoletti R; Paredes JM; Pedaletti G; Penil P; Peresano M; Persic M; Moroni PGP; Prandini E; Puljak I; Garcia JR; Rhode W; Ribo M; Rico J; Righi C; Rugliancich A; Saha L; Saito T; Satalecka K; Schweizer T; Sitarek J; Snidaric I; Sobczynska D; Somero A; Stamerra A; Strzys M; Suric T; Tavecchio F; Temnikov P; Terzic T; Teshima M; Torres-Alba N; Tsujimoto S; Vanzo G; Acosta M; Vovk I; Ward JE; Will M; Zaric D; Wilhelmi EO; Torres DF; Zanin R; Torres DF; Zanin R; MAGIC Collaboration
Discovery of TeV gamma-ray emission from the neighbourhood of the supernova remnant G24.7+0.6 by MAGIC
OXFORD UNIV PRESS
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042824728
https://urn.fi/URN:NBN:fi-fe2021042824728
Tiivistelmä
SNR G24.7+0.6 is a 9.5 kyrs radio and gamma-ray supernova remnant evolving in a dense medium. In the GeV regime, SNR G24.7+0.6 (3FHL J1834.1-0706e/FGFS J1834.1-0706) shows a hard spectral index (Gamma similar to 2) up to 200 GeV, which makes it a good candidate to be observed with Cherenkov telescopes such as MAGIC. We observed the field of view of SNR G24.7+0.6 with the MAGIC telescopes for a total of 31 h. We detect very high-energy gamma-ray emission from an extended source located 0.34 degrees away from the centre of the radio SNR. The new source, named MAGIC J1835-069 is detected up to 5 TeV, and its spectrum is well-represented by a power-law function with spectral index of 2.74 +/- 0.08. The complexity of the region makes the identification of the origin of the very high-energy emission difficult; however, the spectral agreement with the LAT source and overlapping position at less than 1.5 sigma point to a common origin. We analysed 8 yr of Fermi-LAT data to extend the spectrum of the source down to 60 MeV. Fermi-LAT and MAGIC spectra overlap within errors and the global broad-band spectrum is described by a power law with exponential cut-off at 1.9 +/- 0.5 TeV. The detected gamma-ray emission can be interpreted as the results of proton-proton interaction between the supernova and the CO-rich surrounding.
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