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Title: Fermi large area telescope detection of extended gamma-ray emission from the radio galaxy Fornax A
Authors: M. Ackermann
M. Ajello
L. Baldini
J. Ballet
G. Barbiellini
D. Bastieri
R. Bellazzini
E. Bissaldi
R. D. Blandford
E. D. Bloom
R. Bonino
T. J. Brandt
J. Bregeon
P. Bruel
R. Buehler
S. Buson
G. A. Caliandro
R. A. Cameron
M. Caragiulo
P. A. Caraveo
E. Cavazzuti
C. Cecchi
E. Charles
A. Chekhtman
C. C. Cheung
G. Chiaro
S. Ciprini
J. M. Cohen
J. Cohen-Tanugi
F. Costanza
S. Cutini
F. D'Ammando
D. S. Davis
A. De Angelis
F. De Palma
R. Desiante
S. W. Digel
N. Di Lalla
M. Di Mauro
L. Di Venere
C. Favuzzi
S. J. Fegan
E. C. Ferrara
W. B. Focke
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
M. Georganopoulos
N. Giglietto
F. Giordano
M. Giroletti
G. Godfrey
D. Green
I. A. Grenier
S. Guiriec
E. Hays
J. W. Hewitt
A. B. Hill
T. Jogler
G. Jóhannesson
S. Kensei
M. Kuss
S. Larsson
L. Latronico
J. Li
L. Li
F. Longo
F. Loparco
P. Lubrano
Deutsche Elektronen-Synchrotron
Clemson University
Università di Pisa
Kavli Institute for Particle Astrophysics and Cosmology
Institut de Recherche sur les Lois Fondamentales de l'Univers
Istituto Nazionale di Fisica Nucleare, Roma
Universita degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Università degli Studi di Padova
Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
Università degli Studi di Torino
NASA Goddard Space Flight Center
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
University of Maryland, Baltimore County
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
Università degli Studi di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Universita degli Studi di Perugia
George Mason University, Fairfax Campus
Naval Research Laboratory
University of Maryland
Istituto Di Radioastronomia, Bologna
Alma Mater Studiorum Università di Bologna
Universita degli Studi di Udine
Università degli Studi di Napoli Federico II
Hiroshima University
Erlangen Centre for Astroparticle Physics
University of North Florida
University of Southampton
University Science Institute Reykjavik
The Royal Institute of Technology (KTH)
Oskar Klein Centre for Cosmoparticle Physics
Universitat Autònoma de Barcelona
Mahidol University
University of California, Irvine
University of Denver
Max Planck Institut fur Physik (Werner-Heisenberg-Institut)
Keywords: Earth and Planetary Sciences
Issue Date: 20-Jul-2016
Citation: Astrophysical Journal. Vol.826, No.1 (2016)
Abstract: © 2016. The American Astronomical Society. All rights reserved. We report the Fermi Large Area Telescope detection of extended γ-ray emission from the lobes of the radio galaxy Fornax A using 6.1 years of Pass 8 data. After Centaurus A, this is now the second example of an extended γ-ray source attributed to a radio galaxy. Both an extended flat disk morphology and a morphology following the extended radio lobes were preferred over a point-source description, and the core contribution was constrained to be % of the total γ-ray flux. A preferred alignment of the γ-ray elongation with the radio lobes was demonstrated by rotating the radio lobes template. We found no significant evidence for variability on ∼0.5 year timescales. Taken together, these results strongly suggest a lobe origin for the γ-rays. With the extended nature of the γ-ray emission established, we model the source broadband emission considering currently available total lobe radio and millimeter flux measurements, as well as X-ray detections attributed to inverse Compton (IC) emission off the cosmic microwave background (CMB). Unlike the Centaurus A case, we find that a leptonic model involving IC scattering of CMB and extragalactic background light (EBL) photons underpredicts the γ-ray fluxes by factors of about ∼2-3, depending on the EBL model adopted. An additional γ-ray spectral component is thus required, and could be due to hadronic emission arising from proton-proton collisions of cosmic rays with thermal plasma within the radio lobes.
ISSN: 15384357
Appears in Collections:Scopus 2016-2017

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