Fermi Large Area Telescope Observations Of Misaligned Active Galactic Nuclei
Abstract
Analysis is presented for 15 months of data taken with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope for 11 non-blazar active galactic nuclei (AGNs), including seven FRI radio galaxies and four FRII radio sources consisting of two FRII radio galaxies and two steep spectrum radio quasars. The broad line FRI radio galaxy 3C 120 is reported here as a γ-ray source for the first time. The analysis is based on directional associations of LAT sources with radio sources in the 3CR, 3CRR, and MS4 (collectively referred to as 3C-MS) catalogs. Seven of the eleven LAT sources associated with 3C-MS radio sources have spectral indices larger than 2.3 and, except for the FRI radio galaxy NGC 1275 that shows possible spectral curvature, are well described by a power law. No evidence for time variability is found for any sources other than NGC 1275. The γ-ray luminosities of FRI radio galaxies are significantly smaller than those of the BL Lac objects detected by the LAT, whereas the γ-ray luminosities of the FRII sources are quite similar to those of FSRQs, which could reflect different beaming factors for the γ-ray emission. A core dominance (CD) study of the 3CRRmore »
- Authors:
-
- Naval Research Lab. (NRL), Washington, DC (United States);et al.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi LAT Collaboration
- OSTI Identifier:
- 1357528
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 720; Journal Issue: 1; Journal ID: ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Abdo, A. A. Fermi Large Area Telescope Observations Of Misaligned Active Galactic Nuclei. United States: N. p., 2010.
Web. doi:10.1088/0004-637X/720/1/912.
Abdo, A. A. Fermi Large Area Telescope Observations Of Misaligned Active Galactic Nuclei. United States. https://doi.org/10.1088/0004-637X/720/1/912
Abdo, A. A. Fri .
"Fermi Large Area Telescope Observations Of Misaligned Active Galactic Nuclei". United States. https://doi.org/10.1088/0004-637X/720/1/912. https://www.osti.gov/servlets/purl/1357528.
@article{osti_1357528,
title = {Fermi Large Area Telescope Observations Of Misaligned Active Galactic Nuclei},
author = {Abdo, A. A.},
abstractNote = {Analysis is presented for 15 months of data taken with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope for 11 non-blazar active galactic nuclei (AGNs), including seven FRI radio galaxies and four FRII radio sources consisting of two FRII radio galaxies and two steep spectrum radio quasars. The broad line FRI radio galaxy 3C 120 is reported here as a γ-ray source for the first time. The analysis is based on directional associations of LAT sources with radio sources in the 3CR, 3CRR, and MS4 (collectively referred to as 3C-MS) catalogs. Seven of the eleven LAT sources associated with 3C-MS radio sources have spectral indices larger than 2.3 and, except for the FRI radio galaxy NGC 1275 that shows possible spectral curvature, are well described by a power law. No evidence for time variability is found for any sources other than NGC 1275. The γ-ray luminosities of FRI radio galaxies are significantly smaller than those of the BL Lac objects detected by the LAT, whereas the γ-ray luminosities of the FRII sources are quite similar to those of FSRQs, which could reflect different beaming factors for the γ-ray emission. A core dominance (CD) study of the 3CRR sample indicates that sources closer to the jet axis are preferentially detected with the Fermi LAT, insofar as the γ-ray-detected misaligned AGNs have larger CD at a given average radio flux. The results are discussed in view of the AGN unification scenario.},
doi = {10.1088/0004-637X/720/1/912},
journal = {The Astrophysical Journal},
number = 1,
volume = 720,
place = {United States},
year = {Fri Aug 13 00:00:00 EDT 2010},
month = {Fri Aug 13 00:00:00 EDT 2010}
}
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- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Broad Line Radio Galaxies Observed with Fermi-LAT: The Origin of the GeV Gamma-Ray Emission
text, January 2011
- Kataoka, J.; Stawarz, L.; Takahashi, Y.
- arXiv
The radio/gamma-ray connection in Active Galactic Nuclei in the era of the Fermi Large Area Telescope
text, January 2011
- Ackermann, M.; Ajello, M.; Allafort, A.
- arXiv
GENJI Programme: Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI
text, January 2012
- Nagai, Hiroshi; Kino, Motoki; Niinuma, Kotaro
- arXiv
Suzaku Observations of gamma-Ray Bright Radio Galaxies: Origin of the X-ray Emission and Broad-Band Modelin
text, January 2014
- Fukazawa, Yasushi; Finke, Justin; Stawarz, Lukasz
- arXiv
High-energy Emission Processes in M 87
preprint, January 2015
- de Jong, S.; Beckmann, V.; Soldi, S.
- arXiv
The high-energy gamma-ray detection of G73.9+0.9, a supernova remnant interacting with a molecular cloud
text, January 2015
- Zdziarski, Andrzej A.; Malyshev, Denys; Wilhelmi, Emma de Ona
- arXiv
Fermi-LAT Observation of Non-Blazar AGNs
text, January 2018
- Sahakyan, N.; Baghmanyan, V.; Zargaryan, D.
- arXiv
Revealing the Broad Line Region of NGC 1275: The Relationship to Jet Power
text, January 2018
- Punsly, Brian; Marziani, Paola; Bennert, Vardha N.
- arXiv
The High Energy View of FR0 Radio Galaxies
preprint, January 2019
- Baldi, Ranieri D.; Torresi, Eleonora; Migliori, Giulia
- arXiv
Gamma-ray observations of low-luminosity active galactic nuclei
text, January 2020
- de Menezes, Raniere; Nemmen, Rodrigo; Finke, Justin D.
- arXiv