Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A

A. A. Abdo; Markus Ackermann; Marco Ajello; W. B. Atwood; Luca Baldini; Jean Ballet; Guido Barbiellini; D. Bastieri; B. M. Baughman; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; T. J. Brandt; J. Bregeon; A. Brez; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; A. Cannon; P. A. Caraveo; S. Carrigan; J. M. Casandjian; E. Cavazzuti; C. Cecchi; O. Celik; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; S. Colafrancesco; L. R. Cominsky; J. Conrad; L. Costamante; D. S. Davis; C. D. Dermer; A. de Angelis; F. de Palma; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; A. Falcone; C. Farnier; C. Favuzzi; S. J. Fegan; J. Finke; W. B. Focke; P. Fortin; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; M. Georganopoulos; S. Germani; B. Giebels; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; P. Grandi; I. A. Grenier; M.-H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; D. Hadasch; A. K. Harding; Hayo Hase; M. Hayashida; E. Hays; D. Horan; R. E. Hughes; R. Itoh; M. S. Jackson; G. Johannesson; A. S. Johnson; T. J. Johnson; W. N. Johnson; M. Kadler; T. Kamae; H. Katagiri; J. Kataoka; N. Kawai; T. Kishishita; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; W. Mcconville; J. E. Mcenery; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; C. A. Muller; T. Nakamori; M. Naumann-Godo; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; R. Ojha; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; C. Pagani; D. Paneque; J. H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; C. Plotz; T.A. Porter; S. Raino; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; T. Reposeur; J. Ripken; S. Ritz; A. Y. Rodriguez; M. Roth; F. Ryde; H. F.-W. Sadrozinski; D. Sanchez; A. Sander; J. D. Scargle; C. Sgro; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; Jean-Luc Starck; L. Stawarz; M. S. Strickman; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; D. J. Thompson; L. Tibaldo; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/719/2/1433

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Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A

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Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A

A. A. Abdo, Markus Ackermann, Marco Ajello, W. B. Atwood, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, B. M. Baughman, K. Bechtol, …

The Astrophysical Journal, Vol.719, pp.1433-1444

20/08/2010

DOI: https://doi.org/10.1088/0004-637X/719/2/1433

Abstract

galaxies: individual (Centaurus A)

galaxies: jets

gamma rays: galaxies

radiation mechanisms: non-thermal

galaxies: active

98.35.-a Characteristics and properties of the Milky Way galaxy 95.85.Pw &ggr;-ray

We present gamma-ray observations with the LAT on board the Fermi Gamma-Ray Telescope of the nearby radio galaxy Centaurus~A. The previous EGRET detection is confirmed, and the localization is improved using data from the first 10 months of Fermi science operation. In previous work, we presented the detection of the lobes by the LAT; in this work, we concentrate on the gamma-ray core of Cen~A. Flux levels as seen by the LAT are not significantly different from that found by EGRET, nor is the extremely soft LAT spectrum ($\G=2.67\pm0.10_{stat}\pm0.08_{sys}$ where the photon flux is $\Phi\propto E^{-\G}$). The LAT core spectrum, extrapolated to higher energies, is marginally consistent with the non-simultaneous HESS spectrum of the source. The LAT observations are complemented by simultaneous observations from Suzaku, the Swift Burst Alert Telescope and X-ray Telescope, and radio observations with the Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry (TANAMI) program, along with a variety of non-simultaneous archival data from a variety of instruments and wavelengths to produce a spectral energy distribution (SED). We fit this broadband data set with a single-zone synchrotron/synchrotron self-Compton model, which describes the radio through GeV emission well, but fails to account for the non-simultaneous higher energy TeV emission observed by HESS from 2004-2008. The fit requires a low Doppler factor, in contrast to BL Lacs which generally require larger values to fit their broadband SEDs. This indicates the $\g$-ray emission originates from a slower region than that from BL Lacs, consistent with previous modeling results from Cen~A. This slower region could be a slower moving layer around a fast spine, or a slower region farther out from the black hole in a decelerating flow.

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Title: Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A
Creators - without role: A. A. Abdo
Markus Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Stanford University
W. B. Atwood
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
B. M. Baughman
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
B. Berenji - Stanford University
R. D. Blandford
E. D. Bloom
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
S. Buson - University of Padua
G. A. Caliandro
R. A. Cameron
A. Cannon - University College Dublin
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
S. Carrigan - University of Padua
J. M. Casandjian - Astrophysique Interprétation Modélisation
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - University of Perugia
O. Celik - Goddard Space Flight Center
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
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
S. Colafrancesco - Agenzia Spaziale Italiana
L. R. Cominsky
J. Conrad - Stockholm University
L. Costamante - Kavli Institute for Particle Astrophysics and Cosmology
D. S. Davis
C. D. Dermer
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
E. Do Couto E Silva
P. S. Drell
R. Dubois - SLAC National Accelerator Laboratory
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
A. Falcone - Pennsylvania State University
C. Farnier - Laboratoire de Physique Théorique
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
J. Finke - United States Naval Research Laboratory
W. B. Focke
P. Fortin - Centre National de la Recherche Scientifique
M. Frailis - Trieste Astronomical Observatory
Y. Fukazawa - Hiroshima University
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
M. Georganopoulos - University of Maryland, Baltimore County
S. Germani - University of Perugia
B. Giebels - Laboratoire Leprince-Ringuet
N. Giglietto - Polytechnic University of Bari
P. Giommi - Agenzia Spaziale Italiana
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
P. Grandi - National Institute for Astrophysics
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
A. K. Harding
Hayo Hase
M. Hayashida - Kavli Institute for Particle Astrophysics and Cosmology
E. Hays - Goddard Space Flight Center
D. Horan - Laboratoire Leprince-Ringuet
R. E. Hughes
R. Itoh - Hiroshima University
M. S. Jackson
G. Johannesson - Kavli Institute for Particle Astrophysics and Cosmology
A. S. Johnson
T. J. Johnson
W. N. Johnson
M. Kadler - Universitätsklinikum Erlangen
T. Kamae - SLAC National Accelerator Laboratory
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
N. Kawai - RIKEN
T. Kishishita - Institute of Space and Astronautical Science
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. Llena Garde
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Polytechnic University of Bari
B. Lott - Laboratoire de Physique des deux infinis Bordeaux
M. N. Lovellette
P. Lubrano - University of Perugia
A. Makeev - United States Naval Research Laboratory
M. N. Mazziotta
W. Mcconville - Goddard Space Flight Center
J. E. Mcenery
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
C. A. Muller - University of Bamberg
T. Nakamori - Waseda University
M. Naumann-Godo - CEA Paris-Saclay
P. L. Nolan
J. P. Norris
E. Nuss - Laboratoire de Physique Théorique
M. Ohno - Institute of Space and Astronautical Science
T. Ohsugi - Hiroshima University
R. Ojha - United States Naval Observatory
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
C. Pagani - University of Leicester
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
J. H. Panetta
D. Parent - George Mason University
V. Pelassa - Laboratoire de Physique Théorique
M. Pepe - University of Perugia
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Institut National de Physique Nucléaire et de Physique des Particules
C. Plotz - Federal Agency for Cartography and Geodesy
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Raino - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. Rando - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Razzaque - United States Naval Research Laboratory
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
J. Ripken - AlbaNova
S. Ritz - University of California, Santa Cruz
A. Y. Rodriguez
M. Roth - University of Washington
F. Ryde - KTH Royal Institute of Technology
H. F.-W. Sadrozinski
D. Sanchez - Laboratoire Leprince-Ringuet
A. Sander - The Ohio State University
J. D. Scargle
C. Sgro - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind
P. D. Smith
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
Jean-Luc Starck
L. Stawarz
M. S. Strickman
D. J. Suson
H. Tajima - Kavli Institute for Particle Astrophysics and Cosmology
H. Takahashi - Hiroshima University
T. Takahashi - Institute of Space and Astronautical Science
T. Tanaka - Kavli Institute for Particle Astrophysics and Cosmology
J. B. Thayer
J. G. Thayer
D. J. Thompson
L. Tibaldo - CEA Paris-Saclay
D. F. Torres
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Tramacere - Consorzio Interuniversitario Fisica Spaziale
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 - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
A. P. Waite
P. Wang - Stanford University
B. L. Winer
K. S. Wood
Z. Yang - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Ylinen - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal, Vol.719, pp.1433-1444
Identifiers: 9938223709311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00529778