Fermi-LAT Observations of Two Gamma-Ray Emission Components from the Quiescent Sun

A. A. Abdo; M. Ackermann; M. Ajello; L. Baldini; Jean Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; E. Bonamente; A. W. Borgland; A. Bouvier; J. Bregeon; A. Brez; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; S. Cutini; A. de Angelis; F. de Palma; C. D. Dermer; S. W. Digel; E. Do Couto E Silva; P. S. Drell; R. Dubois; C. Favuzzi; S. J. Fegan; W. B. Focke; P. Fortin; M. Frailis; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; L. Grillo; S. Guiriec; D. Hadasch; E. Hays; R. E. Hughes; G. Iafrate; G. Jóhannesson; A. S. Johnson; T. J. Johnson; T. Kamae; H. Katagiri; J. Kataoka; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; A. M. Lionetto; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; J. E. Mcenery; J. Mehault; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; M. Naumann-Godo; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; V. Pelassa; M. Pesce-Rollins; M. Pierbattista; F. Piron; T. A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; H. F.-W. Sadrozinski; T. L. Schalk; C. Sgrò; G. H. Share; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; M. S. Strickman; A. W. Strong; H. Takahashi; T. Tanaka; J. G. Thayer; J. B. Thayer; D. J. Thompson; L. Tibaldo; D. F. Torres; G. Tosti; A. Tramacere; E. Troja; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; N. Vilchez; V. Vitale; A. E. Vladimirov; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; Z. Yang; M. Ziegler

doi:10.1088/0004-637X/734/2/116

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Fermi-LAT Observations of Two Gamma-Ray Emission Components from the Quiescent Sun

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Fermi-LAT Observations of Two Gamma-Ray Emission Components from the Quiescent Sun

A. A. Abdo, M. Ackermann, M. Ajello, L. Baldini, Jean Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, …

The Astrophysical Journal, Vol.734

20/06/2011

DOI: https://doi.org/10.1088/0004-637X/734/2/116

Abstract

astroparticle physics

cosmic rays

gamma rays: general

Sun: atmosphere

Sun: heliosphere

Sun: X-rays

gamma rays

96.60.Tf Solar electromagnetic radiation 96.60.Vg Particle emission, solar wind 96.60.P- Corona 96.50.sb Composition, energy spectra and interactions 96.60.qe Flares

We report the detection of high-energy gamma rays from the quiescent Sun with the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope (Fermi) during the first 18 months of the mission. These observations correspond to the recent period of low solar activity when the emission induced by cosmic rays is brightest. For the first time, the high statistical significance of the observations allows clear separation of the two components: the point-like emission from the solar disk due to cosmic ray cascades in the solar atmosphere, and extended emission from the inverse Compton scattering of cosmic ray electrons on solar photons in the heliosphere. The observed integral flux (>100 MeV) from the solar disk is (4.6 +/- 0.2 [statistical error] +1.0/-0.8 [systematic error]) x10^{-7} cm^{-2} s^{-1}, which is ~7 times higher than predicted by the "nominal" model of Seckel et al. (1991). In contrast, the observed integral flux (>100 MeV) of the extended emission from a region of 20 deg radius centered on the Sun, but excluding the disk itself, (6.8 +/-0.7 [stat.] +0.5/-0.4 [syst.]) x10^{-7} cm^{-2} s^{-1}, along with the observed spectrum and the angular profile, are in good agreement with the theoretical predictions for the inverse Compton emission.

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Title: Fermi-LAT Observations of Two Gamma-Ray Emission Components from the Quiescent Sun
Creators - without role: A. A. Abdo - George Mason University
M. Ackermann - Stanford University
M. Ajello - Stanford University
L. Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
G. Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
B. Berenji - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A. W. Borgland - Stanford University
A. Bouvier - University of California, Santa Cruz
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Brez - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - Kavli Institute for Particle Astrophysics and Cosmology
S. Buson - University of Padua
G. A. Caliandro - Institute of Space Sciences
R. A. Cameron - Stanford University
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Université Paris Cité
C. Cecchi - University of Perugia
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman
J. Chiang - SLAC National Accelerator Laboratory
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
J. Conrad - Stockholm University
S. Cutini - Agenzia Spaziale Italiana
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
C. D. Dermer - United States Naval Research Laboratory
S. W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
E. Do Couto E Silva
P. S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
R. Dubois - SLAC National Accelerator Laboratory
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
W. B. Focke - Stanford University
P. Fortin - Centre National de la Recherche Scientifique
M. Frailis - Trieste Astronomical Observatory
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - CEA Paris-Saclay
L. Grillo - Stanford University
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institute of Space Sciences
E. Hays - Goddard Space Flight Center
R. E. Hughes - The Ohio State University
G. Iafrate - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
G. Jóhannesson - University of Iceland
A. S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
T. J. Johnson - Goddard Space Flight Center
T. Kamae - SLAC National Accelerator Laboratory
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
Jürgen Knödlseder - Université de Toulouse
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S.-H. Lee - Kavli Institute for Particle Astrophysics and Cosmology
A. M. Lionetto - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
F. Longo - University of Trieste
F. Loparco - Polytechnic University of Bari
B. Lott - Laboratoire de Physique des deux infinis Bordeaux
M. N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
A. Makeev - George Mason University
M. N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J. E. Mcenery - University of Maryland, College Park
J. Mehault - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
P. F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
A. A. Moiseev - Goddard Space Flight Center
C. Monte - Polytechnic University of Bari
M. E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko - Stanford University
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
T. Nakamori - Waseda University
M. Naumann-Godo - CEA Paris-Saclay
P. L. Nolan - Kavli Institute for Particle Astrophysics and Cosmology
J. P. Norris - University of Denver
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
A. Okumura - Institute of Space and Astronautical Science
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J. F. Ormes - University of Denver
M. Ozaki - Institute of Space and Astronautical Science
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
V. Pelassa - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Pierbattista - Astrophysique, Instrumentation et Modélisation
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Rainò - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
S. Ritz - University of California, Santa Cruz
H. F.-W. Sadrozinski
T. L. Schalk - University of California, Santa Cruz
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
G. H. Share - University of Maryland, College Park
E. J. Siskind - Real Time Tomography
P. D. Smith - The Ohio State University
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
M. S. Strickman - United States Naval Research Laboratory
A. W. Strong - Max Planck Institute for Extraterrestrial Physics
H. Takahashi - Hiroshima University
T. Tanaka - Kavli Institute for Particle Astrophysics and Cosmology
J. G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J. B. Thayer - Stanford University
D. J. Thompson - Goddard Space Flight Center
L. Tibaldo - CEA Paris-Saclay
D. F. Torres - Institució Catalana de Recerca i Estudis Avançats
G. Tosti - University of Perugia
A. Tramacere - Swiss Data Science Center
E. Troja - Goddard Space Flight Center
Y. Uchiyama - SLAC National Accelerator Laboratory
T. L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
J. Vandenbroucke - Stanford University
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - University of Rome Tor Vergata
A. E. Vladimirov - Stanford University
A. P. Waite - Kavli Institute for Particle Astrophysics and Cosmology
P. Wang - Kavli Institute for Particle Astrophysics and Cosmology
B. L. Winer - The Ohio State University
K. S. Wood - United States Naval Research Laboratory
Z. Yang - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal, Vol.734
Identifiers: 9938307709311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00608701