Simple jQuery Dropdowns
Please use this identifier to cite or link to this item:
Title: Gamma-Ray Blazars within the First 2 Billion Years
Authors: M. Ackermann
M. Ajello
L. Baldini
J. Ballet
G. Barbiellini
D. Bastieri
J. Becerra Gonzalez
R. Bellazzini
E. Bissaldi
R. D. Blandford
E. D. Bloom
R. Bonino
E. Bottacini
J. Bregeon
P. Bruel
R. Buehler
S. Buson
R. A. Cameron
M. Caragiulo
P. A. Caraveo
E. Cavazzuti
C. Cecchi
C. C. Cheung
J. Chiang
G. Chiaro
S. Ciprini
J. Conrad
D. Costantin
F. Costanza
S. Cutini
F. D'Ammando
F. De Palma
R. Desiante
S. W. Digel
N. Di Lalla
M. Di Mauro
L. Di Venere
A. Domínguez
P. S. Drell
C. Favuzzi
S. J. Fegan
E. C. Ferrara
J. Finke
W. B. Focke
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
N. Giglietto
F. Giordano
M. Giroletti
D. Green
I. A. Grenier
L. Guillemot
S. Guiriec
D. H. Hartmann
E. Hays
D. Horan
T. Jogler
G. Jóhannesson
A. S. Johnson
M. Kuss
G. La Mura
S. Larsson
L. Latronico
J. Li
F. Longo
F. Loparco
M. N. Lovellette
P. Lubrano
J. D. Magill
S. Maldera
A. Manfreda
L. Marcotulli
M. N. Mazziotta
Deutsche Elektronen-Synchrotron
Clemson University
Università di Pisa
Universite Paris 7- Denis Diderot
Istituto Nazionale di Fisica Nucleare, Roma
Università degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Università degli Studi di Padova
NASA Goddard Space Flight Center
University of Maryland
Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
Kavli Institute for Particle Astrophysics and Cosmology
Università degli Studi di Torino
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
Università degli Studi di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Università degli Studi di Perugia
Naval Research Laboratory
Stockholms universitet
Oskar Klein Centre for Cosmoparticle Physics
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
Alma Mater Studiorum Università di Bologna
Università degli Studi di Napoli Federico II
Università degli Studi di Udine
Hiroshima University
Erlangen Centre for Astroparticle Physics
Universite d'Orleans
Institut National des Sciences de l'Univers
Friedrich-Alexander-Universität Erlangen-Nürnberg
University Science Institute Reykjavik
The Royal Institute of Technology (KTH)
Universitat Autònoma de Barcelona
Mahidol University
University of Denver
Max Planck Institut für Physik (Werner-Heisenberg-Institut)
Osservatorio Astronomico di Trieste
Keywords: Earth and Planetary Sciences
Issue Date: 1-Mar-2017
Citation: Astrophysical Journal Letters. Vol.837, No.1 (2017)
Abstract: © 2017. The American Astronomical Society. All rights reserved. The detection of high-redshift (z > 3) blazars enables the study of the evolution of the most luminous relativistic jets over cosmic time. More importantly, high-redshift blazars tend to host massive black holes and can be used to constrain the space density of heavy black holes in the early universe. Here, we report the first detection with the Fermi-Large Area Telescope of five γ-ray-emitting blazars beyond z = 3.1, more distant than any blazars previously detected in γ-rays. Among these five objects, NVSS J151002+570243 is now the most distant known γ-ray-emitting blazar at z = 4.31. These objects have steeply falling γ-ray spectral energy distributions (SEDs), and those that have been observed in X-rays have a very hard X-ray spectrum, both typical of powerful blazars. Their Compton dominance (ratio of the inverse Compton to synchrotron peak luminosities) is also very large (>20). All of these properties place these objects among the most extreme members of the blazar population. Their optical spectra and the modeling of their optical-UV SEDs confirm that these objects harbor massive black holes (MBH ∼ 10 8-10 Mo ). We find that, at z ≈ 4, the space density of >109 Mo black holes hosted in radio-loud and radio-quiet active galactic nuclei are similar, implying that radio-loudness may play a key role in rapid black hole growth in the early universe.
ISSN: 20418213
Appears in Collections:Scopus 2016-2017

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.