Fermi Discovery of Gamma-Ray Emission from NGC 1275

A. A. Abdo; M. Ackermann; M. Ajello; K. Asano; L. Baldini; Jean Ballet; G. Barbiellini; D. Bastieri; B. M. Baughman; K. Bechtol; R. Bellazzini; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; J. Bregeon; A. Brez; M. Brigida; Pascal Bruel; T. H. Burnett; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; E. Cavazzuti; C. Cecchi; A. Celotti; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; S. Colafrancesco; L. R. Cominsky; J. Conrad; L. Costamante; C. D. Dermer; A. de Angelis; F. de Palma; S. W. Digel; D. Donato; E. Do Couto e Silva; P. S. Drell; R. Dubois; D. Dumora; C. Farnier; C. Favuzzi; J. Finke; W. B. Focke; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; M. Georganopoulos; S. Germani; B. Giebels; N. Giglietto; F. Giordano; T. Glanzman; I. A. Grenier; M.-H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; Y. Hanabata; A. K. Harding; R. C. Hartman; M. Hayashida; E. Hays; R. E. Hughes; G. J'Ohannesson; A. S. Johnson; R. P. Johnson; W. N. Johnson; M. Kadler; T. Kamae; Y. Kanai; H. Katagiri; J. Kataoka; N. Kawai; M. Kerr; Jürgen Knödlseder; F. Kuehn; M. Kuss; L. Latronico; M. Lemoine-Goumard; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; G. M. Madejski; A. Makeev; M. N. Mazziotta; J. E. Mcenery; C. Meurer; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; D. Paneque; J. H. Panetta; D. Parent; M. Pepe; M. Pesce-Rollins; F. Piron; T. A. Porter; S. Rain'O; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; A. Y. Rodriguez; R. W. Romani; F. Ryde; H. F.-W. Sadrozinski; R. Sambruna; D. Sanchez; A. Sander; R. Sato; P. M. Saz Parkinson; C. Sgr'O; David Stanley Smith; P. D. Smith; G. Spandre; P. Spinelli; Jean-Luc Starck; M. S. Strickman; A. W. Strong; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; G. B. Taylor; J. G. Thayer; D. J. Thompson; D. F. Torres; G. Tosti; Y. Uchiyama; T. L. Usher; N. Vilchez; V. Vitale; A. P. Waite; K. S. Wood; T. Ylinen; M. Ziegler; H. D. Aller; M. F. Aller; K. I. Kellermann; Y. Y. Kovalev; Yu. A. Koval

doi:10.1088/0004-637X/699/1/31

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Fermi Discovery of Gamma-Ray Emission from NGC 1275

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Fermi Discovery of Gamma-Ray Emission from NGC 1275

A. A. Abdo, M. Ackermann, M. Ajello, K. Asano, L. Baldini, Jean Ballet, G. Barbiellini, D. Bastieri, B. M. Baughman, K. Bechtol, …

The Astrophysical Journal Letters, Vol.699, pp.31-39

2009

DOI: https://doi.org/10.1088/0004-637X/699/1/31

Abstract

We report the discovery of high-energy (E>100 MeV) gamma-ray emission from NGC 1275, a giant elliptical galaxy lying at the center of the Perseus cluster of galaxies, based on observations made with the Large Area Telescope (LAT) of the Fermi Gamma ray Space Telescope. The positional center of the gamma-ray source is only ~3' away from the NGC 1275 nucleus, well within the 95% LAT error circle of ~5'.The spatial distribution of gamma-ray photons is consistent with a point source. The average flux and power-law photon index measured with the LAT from 2008 August 4 to 2008 December 5 are F_gamma = (2.10+-0.23)x 10^{-7} ph (>100 MeV) cm^{-2} s^{-1} and Gamma = 2.17+-0.05, respectively. The measurements are statistically consistent with constant flux during the four-month LAT observing period. Previous EGRET observations gave an upper limit of F_gamma < 3.72x 10 ^{-8} ph (>100 MeV) cm^{-2} s^{-1} to the gamma-ray flux from NGC 1275. This indicates that the source is variable on timescales of years to decades, and therefore restricts the fraction of emission that can be produced in extended regions of the galaxy cluster. Contemporaneous and historical radio observations are also reported. The broadband spectrum of NGC 1275 is modeled with a simple one-zone synchrotron/synchrotron self-Compton model and a model with a decelerating jet flow.

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Title: Fermi Discovery of Gamma-Ray Emission from NGC 1275
Creators - without role: A. A. Abdo - United States Naval Research Laboratory
M. Ackermann - SLAC National Accelerator Laboratory
M. Ajello - SLAC National Accelerator Laboratory
K. Asano - Tokyo Institute of Technology
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
B. M. Baughman - The Ohio State University
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
R. D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E. D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A. W. Borgland - Stanford University
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
T. H. Burnett - University of Washington
G. A. Caliandro - Polytechnic University of Bari
R. A. Cameron - Stanford University
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Université Paris Cité
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - University of Perugia
A. Celotti - Scuola Internazionale Superiore di Studi Avanzati
A. Chekhtman - United States Naval Research Laboratory
C. C. Cheung - Goddard Space Flight Center
J. Chiang - Stanford University
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Centre National de la Recherche Scientifique
S. Colafrancesco - Agenzia Spaziale Italiana
L. R. Cominsky - Sonoma State University
J. Conrad - Stockholm University
L. Costamante - Kavli Institute for Particle Astrophysics and Cosmology
C. D. Dermer - United States Naval Research Laboratory
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
D. Donato - Goddard Space Flight Center
E. Do Couto e Silva
P. S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
R. Dubois - SLAC National Accelerator Laboratory
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
C. Farnier - Laboratoire de Physique Théorique
C. Favuzzi - Polytechnic University of Bari
J. Finke - United States Naval Research Laboratory
W. B. Focke - Stanford University
M. Frailis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Y. Fukazawa - Hiroshima University
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. Georganopoulos - University of Maryland, Baltimore County
S. Germani - University of Perugia
B. Giebels - Laboratoire Leprince-Ringuet
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
T. Glanzman - Stanford University
I. A. Grenier - CEA Paris-Saclay
M.-H. Grondin - Laboratoire de Physique des deux infinis Bordeaux
J. E. Grove - United States Naval Research Laboratory
L. Guillemot - Laboratoire de Physique des deux infinis Bordeaux
S. Guiriec - University of Alabama in Huntsville
Y. Hanabata - Hiroshima University
A. K. Harding - Goddard Space Flight Center
R. C. Hartman - Goddard Space Flight Center
M. Hayashida - Stanford University
E. Hays - Goddard Space Flight Center
R. E. Hughes - The Ohio State University
G. J'Ohannesson
A. S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
R. P. Johnson - University of California, Santa Cruz
W. N. Johnson - United States Naval Research Laboratory
M. Kadler - Universities Space Research Association
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
Y. Kanai - Tokyo Institute of Technology
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
N. Kawai - RIKEN
M. Kerr - University of Washington
Jürgen Knödlseder - Centre National de la Recherche Scientifique
F. Kuehn - The Ohio State University
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Lemoine-Goumard - Institut National de Physique Nucléaire et de Physique des Particules
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
G. M. Madejski - Kavli Institute for Particle Astrophysics and Cosmology
A. Makeev - United States Naval Research Laboratory
M. N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J. E. Mcenery - Goddard Space Flight Center
C. Meurer - AlbaNova
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 - Tokyo Institute of Technology
P. L. Nolan - Kavli Institute for Particle Astrophysics and Cosmology
J. P. Norris - University of Denver
E. Nuss - Laboratoire de Physique Théorique
T. Ohsugi - Hiroshima University
N. Omodei - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J. F. Ormes - University of Denver
D. Paneque - Stanford University
J. H. Panetta - Stanford University
D. Parent - Laboratoire de Physique des deux infinis Bordeaux
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
T. A. Porter - University of California, Santa Cruz
S. Rain'O
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
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
S. Ritz - Goddard Space Flight Center
A. Y. Rodriguez - Max Planck Institute for Extraterrestrial Physics
R. W. Romani - Kavli Institute for Particle Astrophysics and Cosmology
F. Ryde - AlbaNova
H. F.-W. Sadrozinski - University of California, Santa Cruz
R. Sambruna - Goddard Space Flight Center
D. Sanchez - Laboratoire Leprince-Ringuet
A. Sander - The Ohio State University
R. Sato - Institute of Space and Astronautical Science
P. M. Saz Parkinson
C. Sgr'O
David Stanley Smith - Laboratoire de Physique des deux infinis Bordeaux
P. D. Smith - The Ohio State University
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
Jean-Luc Starck - Astrophysique Interprétation Modélisation
M. S. Strickman - United States Naval Research Laboratory
A. W. Strong - Max Planck Institute for Extraterrestrial Physics
D. J. Suson - Purdue University Northwest
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
G. B. Taylor - University of New Mexico
J. G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
D. J. Thompson - Goddard Space Flight Center
D. F. Torres - Institute of Space Sciences
G. Tosti - University of Perugia
Y. Uchiyama - SLAC National Accelerator Laboratory
T. L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
A. P. Waite - Kavli Institute for Particle Astrophysics and Cosmology
K. S. Wood - United States Naval Research Laboratory
T. Ylinen - AlbaNova
M. Ziegler - University of California, Santa Cruz
H. D. Aller - University of Michigan–Ann Arbor
M. F. Aller - University of Michigan–Ann Arbor
K. I. Kellermann - National Radio Astronomy Observatory
Y. Y. Kovalev - Astro Space Center
Yu. A. Koval
Publication Details: The Astrophysical Journal Letters, Vol.699, pp.31-39
Identifiers: 9937878309311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00378198