Fermi Large Area Telescope Observation of a Gamma-ray Source at the Position of Eta Carinae

A.A. Abdo; Markus Ackermann; Marco Ajello; A. Allafort; Luca Baldini; Jean Ballet; Guido Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. Bonamente; A. W. Borgland; A. Bouvier; T. J. Brandt; J. Bregeon; A. Brez; M. Brigida; Pascal Bruel; R. Buehler; T. H. Burnett; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; C. Cecchi; Ö. Çelik; S. Chaty; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; L. R. Cominsky; J. Conrad; C. D. Dermer; F. de Palma; S. W. Digel; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; C. Favuzzi; S. J. Fegan; E. C. Ferrara; M. Frailis; Y. Fukazawa; P. Fusco; F. Gargano; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; G. Godfrey; I. A. Grenier; M.-H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; D. Hadasch; Y. Hanabata; A. K. Harding; M. Hayashida; E. Hays; A. B. Hill; D. Horan; R. E. Hughes; R. Itoh; M. S. Jackson; G. Jóhannesson; A. S. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; M. Kerr; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Lemoine-Goumard; M. Livingstone; M. Llena Garde; F. Longo; F. Loparco; 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; J. H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; T.A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; A. Y. Rodriguez; R. W. Romani; M. Roth; H. F.-W. Sadrozinski; A. Sander; P. M. Saz Parkinson; J. D. Scargle; C. Sgrò; E. J. Siskind; David Stanley Smith; P. D. Smith; G. Spandre; P. Spinelli; M. S. Strickman; D. J. Suson; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; D. J. Thompson; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; N. Vilchez; V. Vitale; A. P. Waite; E. Wallace; P. Wang; B. L. Winer; K. S. Wood; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/723/1/649

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Fermi Large Area Telescope Observation of a Gamma-ray Source at the Position of Eta Carinae

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Fermi Large Area Telescope Observation of a Gamma-ray Source at the Position of Eta Carinae

A.A. Abdo, Markus Ackermann, Marco Ajello, A. Allafort, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, …

The Astrophysical Journal, Vol.723, pp.649-657

01/11/2010

DOI: https://doi.org/10.1088/0004-637X/723/1/649

Abstract

binaries: general

stars: individual (Eta Carinae)

supergiants

97.30.Eh, 95.85.Pw, 98.70.Rz, 97.20.Pm

The Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope detected a gamma-ray source that is spatially consistent with the location of Eta Carinae. This source has been persistently bright since the beginning of the LAT survey observations (from 2008 August to 2009 July, the time interval considered here). The gamma-ray signal is detected significantly throughout the LAT energy band (i.e., up to ~100 GeV). The 0.1-100 GeV energy spectrum is well represented by a combination of a cutoff power-law model (< 10 GeV) and a hard power-law component (> 10 GeV). The total flux (> 100 MeV) is $3.7^{+0.3}_{-0.1} \times 10^{-7}$ photons s$^{-1}$ cm$^{-2}$, with additional systematic uncertainties of 10%, and consistent with the average flux measured by AGILE (Tavani et al. 2009). The light curve obtained by Fermi is consistent with steady emission. Our observations do not confirm the presence of a gamma-ray flare in 2008 October as reported by Tavani et al. (2009), although we cannot exclude that a flare lasting only a few hours escaped detection by the Fermi LAT. We also do not find any evidence for gamma-ray variability that correlates with the large X-ray variability of Eta Carinae observed during 2008 December and 2009 January. We are thus not able to establish an unambiguous identification of the LAT source with Eta Carinae.

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Title: Fermi Large Area Telescope Observation of a Gamma-ray Source at the Position of Eta Carinae
Creators - without role: A.A. Abdo - United States Naval Research Laboratory
Markus Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Kavli Institute for Particle Astrophysics and Cosmology
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido 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
R. D. Blandford
E. Bonamente - University of Perugia
A. W. Borgland
A. Bouvier - Kavli Institute for Particle Astrophysics and Cosmology
T. J. Brandt - Centre d'étude spatiale des rayonnements
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
T. H. Burnett
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
S. Carrigan - University of Padua
J. M. Casandjian - Astrophysique Interprétation Modélisation
C. Cecchi - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Ö. Çelik - Goddard Space Flight Center
S. Chaty - Université Paris Cité
A. Chekhtman - United States Naval Research Laboratory
C. C. Cheung
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire de Physique Théorique
L. R. Cominsky
J. Conrad - Stockholm University
C. D. Dermer
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. W. Digel
E. Do Couto E Silva
P. S. Drell
R. Dubois - Kavli Institute for Particle Astrophysics and Cosmology
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
C. Favuzzi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
E. C. Ferrara
M. Frailis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Y. Fukazawa - Hiroshima University
P. Fusco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
N. Gehrels - Goddard Space Flight Center
S. Germani - University of 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 - Astrophysique Interprétation Modélisation
M.-H. Grondin - Laboratoire de Physique des deux infinis Bordeaux
J. E. Grove
L. Guillemot - Laboratoire de Physique des deux infinis Bordeaux
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institució Catalana de Recerca i Estudis Avançats
Y. Hanabata - Hiroshima University
A. K. Harding
M. Hayashida - Kavli Institute for Particle Astrophysics and Cosmology
E. Hays - Goddard Space Flight Center
A. B. Hill - Laboratoire d'Astrophysique de Grenoble
D. Horan - Laboratoire Leprince-Ringuet
R. E. Hughes
R. Itoh - Hiroshima University
M. S. Jackson
G. Jóhannesson - Kavli Institute for Particle Astrophysics and Cosmology
A. S. Johnson
W. N. Johnson
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
M. Kerr - University of Washington
Jürgen Knödlseder - Centre National d'Études Spatiales
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
M. Lemoine-Goumard - Laboratoire de Physique des deux infinis Bordeaux
M. Livingstone - McGill University
M. Llena Garde
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. N. Lovellette
P. Lubrano - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Makeev - United States Naval Research Laboratory
M. N. Mazziotta
J. E. Mcenery
J. Mehault - Institut National de Physique Nucléaire et de Physique des Particules
P. F. Michelson
W. Mitthumsiri - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
A. A. Moiseev
C. Monte - Polytechnic University of Bari
M. E. Monzani
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
T. Nakamori - Waseda University
M. Naumann-Godo - CEA Paris-Saclay
P. L. Nolan
J. P. Norris
E. Nuss - Laboratoire de Physique Théorique
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
M. Ozaki - Institute of Space and Astronautical Science
J. H. Panetta
D. Parent - George Mason University
V. Pelassa - Institut National de Physique Nucléaire et de Physique des Particules
M. Pepe - University of Perugia
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Laboratoire de Physique Théorique
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Rainò - Polytechnic University of Bari
R. Rando - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
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
A. Y. Rodriguez
R. W. Romani
M. Roth - University of Washington
H. F.-W. Sadrozinski
A. Sander - The Ohio State University
P. M. Saz Parkinson
J. D. Scargle
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind
David Stanley Smith - Laboratoire de Physique des deux infinis Bordeaux
P. D. Smith
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. S. Strickman
D. J. Suson
H. Takahashi - Hiroshima University
T. Takahashi - Institute of Space and Astronautical Science
T. Tanaka - Stanford University
J. B. Thayer
J. G. Thayer
D. J. Thompson
L. Tibaldo - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
O. Tibolla - University of Würzburg
D. F. Torres
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Tramacere - Kavli Institute for Particle Astrophysics and Cosmology
Y. Uchiyama - Kavli Institute for Particle Astrophysics and Cosmology
T. L. Usher
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Goddard Space Flight Center
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - University of Rome Tor Vergata
A. P. Waite
E. Wallace - University of Washington
P. Wang - SLAC National Accelerator Laboratory
B. L. Winer
K. S. Wood
Z. Yang - AlbaNova
T. Ylinen - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal, Vol.723, pp.649-657
Identifiers: 9934370809311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00585077