Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations

Markus Ackermann; A. Albert; William B. Atwood; Luca Baldini; Jean Ballet; Guido Barbiellini; D. Bastieri; R. Bellazzini; E. Bissaldi; E. D. Bloom; R. Bonino; T. J. Brandt; J. Bregeon; Pascal Bruel; R. Buehler; G. A. Caliandro; R. A. Cameron; M. Caragiulo; P. A. Caraveo; E. Cavazzuti; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; G. Chiaro; S. Ciprini; J. Cohen-Tanugi; S. Cutini; F. D’ammando; A. de Angelis; F. de Palma; R. Desiante; S. W. Digel; P. S. Drell; C. Favuzzi; E. C. Ferrara; W. B. Focke; A. Franckowiak; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; F. Giordano; G. Godfrey; I. A. Grenier; M.-H. Grondin; Lucas Guillemot; S. Guiriec; A. K. Harding; A. B. Hill; D. Horan; G. Jóhannesson; Jürgen Knödlseder; M. Kuss; S. Larsson; L. Latronico; J. Li; L. Li; F. Longo; F. Loparco; P. Lubrano; S. Maldera; P. Martin; M. Mayer; M. N. Mazziotta; P. F. Michelson; T. Mizuno; M. E. Monzani; A. Morselli; S. Murgia; E. Nuss; T. Ohsugi; M. Orienti; E. Orlando; J. F. Ormes; D. Paneque; M. Pesce-Rollins; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; R. W. Romani; M. Sánchez-Conde; A. Schulz; C. Sgrò; E. J. Siskind; D. A. Smith; F. Spada; G. Spandre; P. Spinelli; D. J. Suson; H. Takahashi; J. B. Thayer; L. Tibaldo; D. F. Torres; G. Tosti; E. Troja; G. Vianello; M. Wood; S. Zimmer

doi:10.1051/0004-6361/201526920

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Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations

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Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations

Markus Ackermann, A. Albert, William B. Atwood, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, E. D. Bloom, …

Astronomy & Astrophysics - A&A, Vol.586

2016

DOI: https://doi.org/10.1051/0004-6361/201526920

Abstract

cosmic rays

Gamma rays: galaxies

Magellanic Clouds

The nearby Large Magellanic Cloud (LMC) provides a rare opportunity of a spatially resolved view of an external star-forming galaxy in gamma-rays. The LMC was detected at 0.1-100GeV as an extended source with CGRO/EGRET and using early observations with the Fermi-LAT. The emission was found to correlate with massive star-forming regions and to be particularly bright towards 30 Doradus. Studies of the origin and transport of cosmic rays (CRs) in the Milky Way are frequently hampered by line-of-sight confusion and poor distance determination. The LMC offers a complementary way to address these questions by revealing whether and how the gamma-ray emission is connected to specific objects, populations of objects, and structures in the galaxy. We revisited the gamma-ray emission from the LMC using about 73 months of Fermi-LAT P7REP data in the 0.2-100GeV range. We developed a complete spatial and spectral model of the LMC emission, for which we tested several approaches: a simple geometrical description, template-fitting, and a physically driven model for CR-induced interstellar emission. In addition to identifying PSR J0540-6919 through its pulsations, we find two hard sources positionally coincident with plerion N 157B and supernova remnant N 132D, which were also detected at TeV energies with H.E.S.S. We detect an additional soft source that is currently unidentified. Extended emission dominates the total flux from the LMC. It consists of an extended component of about the size of the galaxy and additional emission from 3 to 4 regions with degree-scale sizes. If it is interpreted as CRs interacting with interstellar gas, the large-scale emission implies a large-scale population of ~1-100GeV CRs with a density of ~30% of the local Galactic value. On top of that, the 3 to 4 small-scale emission regions would correspond to enhancements of the CR density by factors 2 to 6 or higher (Abridged).

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Title: Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations
Creators - without role: Markus Ackermann - Deutsches Elektronen-Synchrotron DESY
A. Albert - Kavli Institute for Particle Astrophysics and Cosmology
William B. Atwood - University of California, Santa Cruz
Luca Baldini - University of Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Bissaldi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
E. D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
R. Bonino - University of Turin
T. J. Brandt - Goddard Space Flight Center
J. Bregeon - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
Pascal Bruel - École Polytechnique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
G. A. Caliandro - Kavli Institute for Particle Astrophysics and Cosmology
R. A. Cameron - Kavli Institute for Particle Astrophysics and Cosmology
M. Caragiulo - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman - George Mason University
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
G. Chiaro - University of Padua
S. Ciprini - Agenzia Spaziale Italiana
J. Cohen-Tanugi - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
S. Cutini - Agenzia Spaziale Italiana
F. D’ammando - Istituto di Radioastronomia di Bologna
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Pegaso University
R. Desiante - University of Udine
S. W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
P. S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
C. Favuzzi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
E. C. Ferrara - Goddard Space Flight Center
W. B. Focke - Stanford University
A. Franckowiak - Stanford University
P. Fusco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
N. Giglietto - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
F. Giordano - Polytechnic University of Bari
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - CEA Paris-Saclay
M.-H. Grondin - Institut National de Physique Nucléaire et de Physique des Particules
Lucas Guillemot - Observatoire de Paris
S. Guiriec - Goddard Space Flight Center
A. K. Harding - Goddard Space Flight Center
A. B. Hill - Kavli Institute for Particle Astrophysics and Cosmology
D. Horan - Laboratoire Leprince-Ringuet
G. Jóhannesson - University of Iceland
Jürgen Knödlseder - Université Toulouse III - Paul Sabatier
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Larsson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
J. Li - Institute of Space Sciences
L. Li - KTH Royal Institute of Technology
F. Longo - University of Trieste
F. Loparco - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
P. Lubrano - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
S. Maldera - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
P. Martin - Université Toulouse III - Paul Sabatier
M. Mayer - Deutsches Elektronen-Synchrotron DESY
M. N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P. F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
M. E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
S. Murgia - University of California, Irvine
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
M. Orienti - Istituto di Radioastronomia di Bologna
E. Orlando - SLAC National Accelerator Laboratory
J. F. Ormes - University of Denver
D. Paneque - Max Planck Institute for Physics
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
T. A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Rainò - Polytechnic University of Bari
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
O. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
R. W. Romani - Kavli Institute for Particle Astrophysics and Cosmology
M. Sánchez-Conde - AlbaNova
A. Schulz - Deutsches Elektronen-Synchrotron DESY
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind - Real Time Tomography
D. A. Smith - Institut National de Physique Nucléaire et de Physique des Particules
F. Spada - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. J. Suson - Purdue University Northwest
H. Takahashi - Hiroshima University
J. B. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
L. Tibaldo - Kavli Institute for Particle Astrophysics and Cosmology
D. F. Torres - Institute of Space Sciences
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
E. Troja - Goddard Space Flight Center
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
M. Wood - SLAC National Accelerator Laboratory
S. Zimmer - AlbaNova
Publication Details: Astronomy & Astrophysics - A&A, Vol.586
Identifiers: 9934020709311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: insu-01360102