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Title: Broad-line radio galaxies observed with Fermi-LAT: The origin of the GeV γ-ray emission

Journal Article · · The Astrophysical Journal
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [7];  [8];  [8];  [1];  [1];  [9];  [10];  [4];  [11];  [12];  [13]
  1. Waseda Univ., Tokyo (Japan)
  2. Institute of Space and Astronautical Science, Kanagawa (Japan); Jagiellonian Univ., Krakow (Poland)
  3. National Academy of Sciences, Washington, D.C. (United States); Naval Research Lab., Washington, D.C. (United States)
  4. Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
  5. INAF-IASF, Bologna (Italy)
  6. Univ. of Washington, Seattle, WA (United States)
  7. Scuola Internazionale Superiore di Studi Avanzati (SISSA), Trieste (Italy)
  8. Ecole Polytechnique, Palaiseau (France)
  9. Univ. of New Mexico, Albuquerque, NM (United States)
  10. Istituto Nazionale di Fisica Nucleare, Perugia (Italy); Univ. degli Studi di Perugia, Perugia (Italy)
  11. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
  12. Naval Research Lab., Washington, D.C. (United States)
  13. IASF Palermo, Palermo (Italy); INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma (Italy)
+ Show Author Affiliations

Here, we report on a detailed investigation of the γ-ray emission from 18 broad-line radio galaxies (BLRGs) based on two years of Fermi Large Area Telescope data. We confirm the previously reported detections of 3C 120 and 3C 111 in the GeV photon energy range; a detailed look at the temporal characteristics of the observed γ-ray emission reveals in addition possible flux variability in both sources. No statistically significant γ-ray detection of the other BLRGs was found, however, in the considered data set. Though the sample size studied is small, what appears to differentiate 3C 111 and 3C 120 from the BLRGs not yet detected in γ-rays is the particularly strong nuclear radio flux. This finding, together with the indications of the γ-ray flux variability and a number of other arguments presented, indicates that the GeV emission of BLRGs is most likely dominated by the beamed radiation of relativistic jets observed at intermediate viewing angles. In this paper we also analyzed a comparison sample of high-accretion-rate Seyfert 1 galaxies, which can be considered radio-quiet counterparts of BLRGs, and found that none were detected in γ-rays. A simple phenomenological hybrid model applied for the broadband emission of the discussed radio-loud and radio-quiet type 1 active galaxies suggests that the relative contribution of the nuclear jets to the accreting matter is ≥ 1% on average for BLRGs, whereas it is ≤ 0.1% for Seyfert 1 galaxies.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356802
Journal Information:
The Astrophysical Journal, Vol. 740, Issue 1; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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  • The Astrophysical Journal Supplement Series, Vol. 126, Issue 2 https://doi.org/10.1086/313300
journal February 2000
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The remarkable X-ray spectrum of the Broad-Line Radio Galaxy 3C 445 text January 2007
A Chandra study of particle acceleration in the multiple hotspots of nearby radio galaxies text January 2007
The Accretion Geometry in Radio-Loud Active Galaxies text January 2007
The Cosmic MeV Gamma-ray Background and Hard X-ray Spectra of Active Galactic Nuclei: Implications for the Origin of Hot AGN Coronae text January 2007
The Fermi blazars divide text January 2009
The Evolution of Swift/BAT blazars and the origin of the MeV background text January 2009
Constraining the Spin of the Black Hole in Fairall 9 with Suzaku text January 2009
Black Hole Spin and the Radio Loud/Quiet Dichotomy of Active Galactic Nuclei text January 2009
Calibrating the correlation between black hole mass and X-ray variability amplitude: X-ray only black hole mass estimates for active galactic nuclei and ultra-luminous X-ray sources text January 2009
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Connection between the Accretion Disk and Jet in the Radio Galaxy 3C 111 text January 2011
The Suzaku view of 3C 382 text January 2011
X-ray Spectra of a large sample of Quasars with ASCA text January 2000
The Milky Way in Molecular Clouds: A New Complete CO Survey text January 2000
Long-Term, Continuous Monitoring of the Broad Line Radio Galaxies 3C 390.3 and 3C 120 With the Rossi X-Ray Timing Explorer text January 2002
Multiwavelength studies of the Seyfert 1 galaxy NGC7469. II - X-ray and UV observations with XMM-Newton text January 2003
Close and distant reprocessing media in Mkn509 studied with BeppoSAX text January 2003
A Transition in the Accretion Properties of Radio-Loud Active Nuclei text January 2004
Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei III. Kinematics of Parsec-Scale Radio Jets text January 2004
The XMM-Newton View of the Broad-Line Radio Galaxy 3C 120 text January 2004
The First INTEGRAL AGN Catalog text January 2005
Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications text January 2006
Fe K Line Profile in Low-redshift Quasars: Average Shape and Eddington Ratio Dependence text January 2007
Thermal Equilibria of Accretion Disks text January 1994
Radio-loud active galaxies in the northern ROSAT All-Sky Survey. I. Radio identifications text January 1996
Gamma-ray Emission From Advection-Dominated Accretion Flows Around Black Holes: Application to the Galactic Center text January 1997
The ASCA X-Ray Spectrum Of The Broad-Line Radio Galaxy Pictor A: A Simple Power Law With No Fe K-alpha Line text January 1998
The Bright Quasar 3C 273 text January 1998
Constraining the central engine of radio-loud AGNs text January 1999

Cited By (26)

Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective journal June 2018
Very high energy gamma-ray emission of NGC 1275 and 3c382 and the possible activity nature of the Seyfert Galaxies journal January 2013
SUZAKU OBSERVATIONS OF γ-RAY BRIGHT RADIO GALAXIES: ORIGIN OF THE X-RAY EMISSION AND BROADBAND MODELING journal December 2014
An outburst scenario for the X-ray spectral variability in 3C 111 journal July 2013
High-energy emission processes in M87 journal May 2015
Core shifts, magnetic fields and magnetization of extragalactic jets journal May 2015
Comparison of hard X-ray spectra of luminous radio galaxies and their radio-quiet counterparts journal July 2018
Faint γ-ray sources at low redshift: the radio galaxy IC 1531 journal September 2018
Comparison of SEDs of very massive radio-loud and radio-quiet AGN journal December 2019
Comparison of ejection events in the jet and accretion disc outflows in 3C 111: Jet and disc outflows in 3C 111 journal June 2012
SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy: SBS 0846+513: a new γ-ray-emitting NLS1 journal September 2012
X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275 journal March 2018
Examining the High-energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets journal April 2018
JET EMISSION IN YOUNG RADIO SOURCES: A FERMI LARGE AREA TELESCOPE GAMMA-RAY VIEW journal December 2013
Radio/X-ray monitoring of the broad-line radio galaxy 3C 382. High-energy view with XMM–Newton and NuSTAR journal May 2018
Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases for low Luminosity bl lacs journal August 2016
Signatures of the Disk–Jet Coupling in the Broad-line Radio Quasar 4C+74.26 journal October 2018
Hubble Space Telescope Emission-line Images of Nearby 3CR Radio Galaxies: Two Photoionization, Accretion, and Feedback Modes journal January 2019
FIRST DETECTION IN GAMMA-RAYS OF A YOUNG RADIO GALAXY: FERMI -LAT OBSERVATIONS OF THE COMPACT SYMMETRIC OBJECT PKS 1718−649 journal April 2016
An outburst scenario for the X-ray spectral variability in 3C 111 text January 2013
Suzaku Observations of gamma-Ray Bright Radio Galaxies: Origin of the X-ray Emission and Broad-Band Modelin text January 2014
Core shifts, magnetic fields and magnetization of extragalactic jets text January 2014
High-energy Emission Processes in M 87 preprint January 2015
Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases For Low Luminosity BL Lacs text January 2016
Radio/X-ray monitoring of the broad-line radio galaxy 3C 382. High-energy view with XMM-Newton and NuSTAR text January 2018
Comparison of hard X-ray spectra of luminous radio galaxies and their radio-quiet counterparts text January 2018

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
galaxies: active
galaxies: individual (3C 120 3C 111)
galaxies: jets
gamma rays: galaxies
radiation mechanisms: non-thermal
X-rays: galaxies