Fermi/LAT discovery of gamma-ray emission from a relativistic jet in the narrow-line quasar PMN J0948+0022

A.A. Abdo; Markus Ackermann; Marco Ajello; Magnus Axelsson; Luca Baldini; Jean Ballet; Guido Barbiellini; D. Bastieri; M. Battelino; B. M. Baughman; K. Bechtol; R. Bellazzini; E. D. Bloom; E. Bonamente; A. W. Borgland; J. Bregeon; A. Brez; M. Brigida; Pascal Bruel; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; E. Cavazzuti; C. Cecchi; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; W. Collmar; J. Conrad; L. Costamante; C. D. Dermer; A. de Angelis; F. de Palma; S. W. Digel; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; C. Farnier; C. Favuzzi; W. B. Focke; L. Foschini; M. Frailis; L. Fuhrmann; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; N. Gehrels; S. Germani; B. Giebels; N. Giglietto; F. Giordano; M. Giroletti; 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. Johannesson; A. S. Johnson; R. P. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; M. Kerr; Jürgen Knödlseder; F. Kuehn; M. Kuss; J. Lande; L. Latronico; M. Lemoine-Goumard; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; G. M. Madejski; A. Makeev; W. Max-Moerbeck; M. N. Mazziotta; W. Mcconville; J. E. Mcenery; C. Meurer; P. F. Michelson; W. Mitthumsiri; T. Mizuno; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; D. Paneque; J. H. Panetta; D. Parent; V. Pavlidou; T. J. Pearson; M. Pepe; M. Pesce-Rollins; F. Piron; T.A. Porter; S. Raino; R. Rando; M. Razzano; A. Readhead; A. Reimer; O. Reimer; T. Reposeur; J. L. Richards; S. Ritz; A. Y. Rodriguez; R. W. Romani; F. Ryde; H. F.-W. Sadrozinski; R. Sambruna; D. Sanchez; A. Sander; P. M. Saz Parkinson; J. D. Scargle; T. L. Schalk; C. Sgro; David Stanley Smith; G. Spandre; P. Spinelli; Jean-Luc Starck; M. Stevenson; M. S. Strickman; D. J. Suson; G. Tagliaferri; H. Takahashi; T. Tanaka; J. G. Thayer; D. J. Thompson; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; N. Vilchez; V. Vitale; A. P. Waite; B. L. Winer; K. S. Wood; T. Ylinen; J. A. Zensus; M. Ziegler; G. Ghisellini; L. Maraschi; F. Tavecchio; E. Angelakis

doi:10.1088/0004-637X/699/2/976

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Fermi/LAT discovery of gamma-ray emission from a relativistic jet in the narrow-line quasar PMN J0948+0022

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Fermi/LAT discovery of gamma-ray emission from a relativistic jet in the narrow-line quasar PMN J0948+0022

A.A. Abdo, Markus Ackermann, Marco Ajello, Magnus Axelsson, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, M. Battelino, B. M. Baughman, …

The Astrophysical Journal, Vol.699, pp.976-984

10/07/2009

DOI: https://doi.org/10.1088/0004-637X/699/2/976

Abstract

We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy gamma-ray emission from the peculiar quasar PMN J0948+0022 (z=0.5846). The optical spectrum of this object exhibits rather narrow Hbeta (FWHM(Hbeta) ~ 1500 km s^-1), weak forbidden lines and is therefore classified as a narrow-line type I quasar. This class of objects is thought to have relatively small black hole mass and to accrete at high Eddington ratio. The radio loudness and variability of the compact radio core indicates the presence of a relativistic jet. Quasi simultaneous radio-optical-X-ray and gamma-ray observations are presented. Both radio and gamma-ray emission (observed over 5-months) are strongly variable. The simultaneous optical and X-ray data from Swift show a blue continuum attributed to the accretion disk and a hard X-ray spectrum attributed to the jet. The resulting broad band spectral energy distribution (SED) and, in particular, the gamma-ray spectrum measured by Fermi are similar to those of more powerful FSRQ. A comparison of the radio and gamma-ray characteristics of PMN J0948+0022 with the other blazars detected by LAT shows that this source has a relatively low radio and gamma-ray power, with respect to other FSRQ. The physical parameters obtained from modelling the SED also fall at the low power end of the FSRQ parameter region discussed in Celotti & Ghisellini (2008). We suggest that the similarity of the SED of PMN J0948+0022 to that of more massive and more powerful quasars can be understood in a scenario in which the SED properties depend on the Eddington ratio rather than on the absolute power.

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Title: Fermi/LAT discovery of gamma-ray emission from a relativistic jet in the narrow-line quasar PMN J0948+0022
Creators - without role: A.A. Abdo - United States Naval Research Laboratory
Markus Ackermann - Stanford University
Marco Ajello - Stanford University
Magnus Axelsson - AlbaNova
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
M. Battelino - AlbaNova
B. M. Baughman
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. D. Bloom
E. Bonamente - University of Perugia
A. W. Borgland
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
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Astrophysique Interprétation Modélisation
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - University of Perugia
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 - Université de Montpellier
W. Collmar - Max Planck Institute for Extraterrestrial Physics
J. Conrad - Stockholm University
L. Costamante - SLAC National Accelerator Laboratory
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
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. Farnier - Laboratoire de Physique Théorique
C. Favuzzi - Polytechnic University of Bari
W. B. Focke
L. Foschini - Brera Astronomical Observatory
M. Frailis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
L. Fuhrmann - Max Planck Institute for Radio Astronomy
Y. Fukazawa - Hiroshima University
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
B. Giebels - Laboratoire Leprince-Ringuet
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
I. A. Grenier - Astrophysique Interprétation Modélisation
M.-H. Grondin - Centre National de la Recherche Scientifique
J. E. Grove
L. Guillemot - Laboratoire de Physique des deux infinis Bordeaux
S. Guiriec - University of Alabama in Huntsville
Y. Hanabata - Hiroshima University
A. K. Harding
R. C. Hartman
M. Hayashida - Stanford University
E. Hays - Goddard Space Flight Center
R. E. Hughes
G. Johannesson - Stanford University
A. S. Johnson
R. P. 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
F. Kuehn - The Ohio State University
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
M. Lemoine-Goumard - Laboratoire de Physique des deux infinis Bordeaux
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
G. M. Madejski
A. Makeev - United States Naval Research Laboratory
W. Max-Moerbeck - California Institute of Technology
M. N. Mazziotta
W. Mcconville - Goddard Space Flight Center
J. E. Mcenery
C. Meurer - AlbaNova
P. F. Michelson
W. Mitthumsiri - SLAC National Accelerator Laboratory
T. Mizuno - Hiroshima University
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
P. L. Nolan
J. P. Norris
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
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
J. H. Panetta
D. Parent - Laboratoire de Physique des deux infinis Bordeaux
V. Pavlidou - California Institute of Technology
T. J. Pearson
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 - University of California, Santa Cruz
S. Raino - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Readhead
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
J. L. Richards
S. Ritz - Goddard Space Flight Center
A. Y. Rodriguez
R. W. Romani
F. Ryde - AlbaNova
H. F.-W. Sadrozinski
R. Sambruna - Goddard Space Flight Center
D. Sanchez - Centre National de la Recherche Scientifique
A. Sander - The Ohio State University
P. M. Saz Parkinson
J. D. Scargle
T. L. Schalk
C. Sgro - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
David Stanley Smith - Laboratoire de Physique des deux infinis Bordeaux
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
Jean-Luc Starck
M. Stevenson - California Institute of Technology
M. S. Strickman
D. J. Suson
G. Tagliaferri - Brera Astronomical Observatory
H. Takahashi - Hiroshima University
T. Tanaka - Stanford University
J. G. Thayer
D. J. Thompson
L. Tibaldo - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
O. Tibolla - Max Planck Institute for Nuclear Physics
D. F. Torres
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Tramacere - Kavli Institute for Particle Astrophysics and Cosmology
Y. Uchiyama - Stanford University
T. L. Usher
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - University of Rome Tor Vergata
A. P. Waite
B. L. Winer
K. S. Wood
T. Ylinen - AlbaNova
J. A. Zensus
M. Ziegler - University of California, Santa Cruz
G. Ghisellini - Brera Astronomical Observatory
L. Maraschi - Brera Astronomical Observatory
F. Tavecchio - Brera Astronomical Observatory
E. Angelakis - Max Planck Institute for Radio Astronomy
Publication Details: The Astrophysical Journal, Vol.699, pp.976-984
Identifiers: 9937375209311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00394133