RT Journal Article
T1 Studying the nature of the unidentified gamma-ray source HESS J1841-055 with the MAGIC telescopes
A1 Barrio Uña, Juan Abel
A1 Fonseca González, Mª Victoria
A1 Hoang, Kim Dinh
A1 López Moya, Marcos
A1 Miener, Tjark
A1 Miranda Pantoja, José Miguel
A1 Morcuende, D.
A1 Peñil del Campo, Pablo
A1 Saha, Lab
A1 otros, ...
AB We investigate the physical nature and origin of the gamma-ray emission from the extended source HESS J1841-055 observed at TeV and GeV energies. We observed HESS J1841-055 at TeV energies for a total effective time of 43 h with the MAGIC telescopes, in 2012 and 2013. Additionally, we analysed the GeV counterpart making use of about 10 yr of Fermi-LAT data. Using both Fermi-LAT and MAGIC, we study both the spectral and energy-dependent morphology of the source for almost four decades of energy. The origin of the gamma-ray emission from this region is investigated using multiwaveband information on sources present in this region, suggested to be associated with this unidentified gamma-ray source. We find that the extended emission at GeV-TeV energies is best described by more than one source model. We also perform the first energy-dependent analysis of the HESS J1841-055 region at GeV-TeV. We find that the emission at lower energies comes from a diffuse or extended component, while the major contribution of gamma rays above 1 TeV arises from the southern part of the source. Moreover, we find that a significant curvature is present in the combined observed spectrum of MAGIC and Fermi-LAT. The first multiwavelength spectral energy distribution of this unidentified source shows that the emission at GeV-TeV energies can be well explained with both leptonic and hadronic models. For the leptonic scenario, bremsstrahlung is the dominant emission compared to inverse Compton. On the other hand, for the hadronic model, gamma-ray resulting from the decay of neutral pions (pi(0)) can explain the observed spectrum. The presence of dense molecular clouds overlapping with HESS J1841-055 makes both bremsstrahlung and pi(0)-decay processes the dominant emission mechanisms for the source.
PB Wiley
SN 0035-8711
YR 2020
FD 2020-09
LK https://hdl.handle.net/20.500.14352/6708
UL https://hdl.handle.net/20.500.14352/6708
LA eng
NO Artículo firmado por 186 autores. We would like to thank the Instituto de Astrofísica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The financial support by the German BMBF and MPG; the Italian INFN and INAF; the Swiss National Fund SNF; the ERDF under the Spanish MINECO (FPA201569818-P, FPA2012-36668, FPA2015-68378-P, FPA2015-69210-C62-R, FPA2015-69210-C6-4-R, FPA2015-69210-C6-6-R, AYA201571042-P, AYA2016-76012-C3-1-P, ESP2015-71662-C2-2-P, and FPA2017-90566-REDC); the Indian Department of Atomic Energy; and the Japanese JSPS and MEXT; the Bulgarian Ministry of Education and Science, NationalRIRoadmap Project DO1-153/28.08.2018 and the Academy of Finland grant nr. 320045 is gratefully acknowledged. This work was also supported by the Spanish Centro de Excelencia 'Severo Ochoa' SEV-2012-0234 and SEV-2015-0548, and Unidad de Excelencia 'María de Maeztu' MDM-2014-0369, by the Croatian Science Foundation (HrZZ) Project 09/176 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, and by the Polish National Research Centre grant UMO-2016/22/M/ST9/00382 and by the Brazilian MCTIC, CNPq and FAPERJ. This publication makes use of molecular line data from the Boston University-FCRAO Galactic Ring Survey (GRS). The GRS is a joint project of Boston University and Five College Radio Astronomy Observatory, funded by the National Science Foundation under grants AST-9800334, AST-0098562, AST-0100793, AST0228993, and AST-0507657.
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Centro de Excelencia 'Severo Ochoa'
NO Unidad de Excelencia María de Maeztu
NO German BMBF Federal Ministry of Education & Research
NO German MPG
NO Italian INFN Istituto Nazionale di Fisica Nucleare
NO Italian INAF Istituto Nazionale Astrofisica
NO Swiss National Fund SNF
NO Indian Department of Atomic Energy
NO Japanese JSPS Ministry of Education, Culture, Sports, Science and Technology
NO MEXT Ministry of Education, Culture, Sports, Science and Technology, Japan
NO Bulgarian Ministry of Education and Science, NationalRIRoadmap Project
NO Academy of Finland
NO Croatian Science Foundation (HrZZ)
NO University of Rijeka Project
NO DFG Collaborative Research Centers
NO Polish National Research Centre
NO Brazilian MCTIC
NO CNPq National Council for Scientific and Technological Development
NO FAPERJ Carlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro
NO National Science FoundationNational Science Foundation (NSF)
DS Docta Complutense
RD 15 may 2024