SUZAKU OBSERVATIONS OF γ-RAY BRIGHT RADIO GALAXIES: ORIGIN OF THE X-RAY EMISSION AND BROADBAND MODELING

Fukazawa, Yasushi; Itoh, Ryosuke; Tokuda, Shin'ya; Finke, Justin; Stawarz, Łukasz; Tanaka, Yasuyuki

doi:10.1088/0004-637X/798/2/74

Title: SUZAKU OBSERVATIONS OF γ-RAY BRIGHT RADIO GALAXIES: ORIGIN OF THE X-RAY EMISSION AND BROADBAND MODELING

Journal Article · Sat Jan 10 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/798/2/74· OSTI ID:22364671

Fukazawa, Yasushi; Itoh, Ryosuke; Tokuda, Shin'ya ^[1]; Finke, Justin ^[2]; Stawarz, Łukasz ^[3]; Tanaka, Yasuyuki ^[4]

Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
U.S. Naval Research Laboratory, Code 7653, 4555 Overlook Avenue SW, Washington, DC 20375-5352 (United States)
Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)
Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)

We performed a systematic X-ray study of eight nearby γ-ray bright radio galaxies with Suzaku in order to understand the origins of their X-ray emissions. The Suzaku spectra for five of those have been presented previously, while the remaining three (M87, PKS 0625–354, and 3C 78) are presented here for the first time. Based on the Fe-K line strength, X-ray variability, and X-ray power-law photon indices, and using additional information on the [O III] line emission, we argue for a jet origin of the observed X-ray emission in these three sources. We also analyzed five years of Fermi Large Area Telescope (LAT) GeV gamma-ray data on PKS 0625–354 and 3C 78 to understand these sources within the blazar paradigm. We found significant γ-ray variability in the former object. Overall, we note that the Suzaku spectra for both PKS 0625–354 and 3C 78 are rather soft, while the LAT spectra are unusually hard when compared with other γ-ray detected low-power (FR I) radio galaxies. We demonstrate that the constructed broadband spectral energy distributions of PKS 0625–354 and 3C 78 are well described by a one-zone synchrotron/synchrotron self-Compton model. The results of the modeling indicate lower bulk Lorentz factors compared to those typically found in other BL Lacertae (BL Lac) objects, but consistent with the values inferred from modeling other LAT-detected FR I radio galaxies. Interestingly, the modeling also implies very high peak (∼10{sup 16} Hz) synchrotron frequencies in the two analyzed sources, contrary to previously suggested scenarios for Fanaroff-Riley (FR) type I/BL Lac unification. We discuss the implications of our findings in the context of the FR I/BL Lac unification schemes.

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OSTI ID:: 22364671

Journal Information:: Astrophysical Journal, Vol. 798, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X

Country of Publication:: United States

Language:: English

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The First Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope Abdo, A. A. arXiv https://doi.org/10.48550/arxiv.1002.0150	text	January 2010
TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry I. First-Epoch 8.4 GHz Images Ojha, Roopesh; Kadler, Matthias; Böck, Moritz arXiv https://doi.org/10.48550/arxiv.1005.4432	text	January 2010
Fermi Large Area Telescope View of the Core of the Radio Galaxy Centaurus A Collaboration, Fermi; Falcone, A.; Hase, H. arXiv https://doi.org/10.48550/arxiv.1006.5463	text	January 2010
Detection of very high energy gamma-ray emission from the Perseus cluster head-tail galaxy IC 310 by the MAGIC telescopes Collaboration, Magic; Aleksić, J.; Antonelli, L. A. arXiv https://doi.org/10.48550/arxiv.1009.2155	text	January 2010
Broad Line Radio Galaxies Observed with Fermi-LAT: The Origin of the GeV Gamma-Ray Emission Kataoka, J.; Stawarz, L.; Takahashi, Y. arXiv https://doi.org/10.48550/arxiv.1107.3370	text	January 2011
Implications for the structure of the relativistic jet from multiwavelength observations of NGC 6251 Migliori, G.; Grandi, P.; Torresi, E. arXiv https://doi.org/10.48550/arxiv.1107.4302	text	January 2011
The blazar-like radio structure of the TeV source IC310 Kadler, Matthias; Eisenacher, Dorit; Ros, Eduardo arXiv https://doi.org/10.48550/arxiv.1201.2870	text	January 2012
Suzaku X-ray Imaging of the Extended Lobe in the Giant Radio Galaxy NGC6251 Associated with the Fermi-LAT Source 2FGLJ1629.4+8236 Takeuchi, Y.; Kataoka, J.; Stawarz, L. arXiv https://doi.org/10.48550/arxiv.1202.0868	text	January 2012
XMM-Newton observation of M87 I. Single-phase temperature structure of intracluster medium Matsushita, Kyoko; Belsole, Elena; Finoguenov, Alexis arXiv https://doi.org/10.48550/arxiv.astro-ph/0201242	text	January 2002
The black hole mass of low redshift radiogalaxies Bettoni, D.; Falomo, R.; Fasano, G. arXiv https://doi.org/10.48550/arxiv.astro-ph/0212162	text	January 2002
Emission lines and optical continuum in low-luminosity radio galaxies Wills, K. A.; Morganti, R.; Tadhunter, C. N. arXiv https://doi.org/10.48550/arxiv.astro-ph/0310256	text	January 2003
A sample of radio galaxies spanning three decades in radio luminosity - I. The host-galaxy properties and black-hole masses McLure, Ross J.; Willott, Chris J.; Jarvis, Matt J. arXiv https://doi.org/10.48550/arxiv.astro-ph/0403106	text	January 2004
Chandra and XMM-Newton Observations of the Nucleus of Centaurus A Evans, D. A.; Kraft, R. P.; Worrall, D. M. arXiv https://doi.org/10.48550/arxiv.astro-ph/0405539	text	January 2004
ASCA Compilation of X-Ray Properties of Hot Gas in Elliptical Galaxies and Galaxy Clusters: Two Breaks in the Temperature Dependences Fukazawa, Yasushi; Makishima, Kazuo; Ohashi, Takaya arXiv https://doi.org/10.48550/arxiv.astro-ph/0411745	text	January 2004
The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections Kalberla, P. M. W.; Burton, W. B.; Hartmann, Dap arXiv https://doi.org/10.48550/arxiv.astro-ph/0504140	text	January 2005
Scaling Mass Profiles around Elliptical Galaxies Observed with Chandra and XMM-Newton Fukazawa, Y.; Betoya-Nonesa, J. G.; Pu, J. arXiv https://doi.org/10.48550/arxiv.astro-ph/0509521	text	January 2005
The Hot Interstellar Medium of Normal Elliptical Galaxies. I. A Chandra Gas Gallery and Comparison of X-ray and Optical Morphology Diehl, Steven; Statler, Thomas S. arXiv https://doi.org/10.48550/arxiv.astro-ph/0606215	text	January 2006
Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis Ishisaki, Y.; Maeda, Y.; Fujimoto, R. arXiv https://doi.org/10.48550/arxiv.astro-ph/0610118	text	January 2006
Hot and cold gas accretion and feedback in radio-loud active galaxies Hardcastle, M. J.; Evans, D. A.; Croston, J. H. arXiv https://doi.org/10.48550/arxiv.astro-ph/0701857	text	January 2007
ROSAT X-ray observations of 3CRR radio sources Hardcastle, M. J.; Worrall, D. M. arXiv https://doi.org/10.48550/arxiv.astro-ph/9907034	text	January 1999

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H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354 Abdalla, H.; Abramowski, A.; Aharonian, F. Monthly Notices of the Royal Astronomical Society, Vol. 476, Issue 3 https://doi.org/10.1093/mnras/sty439	journal	February 2018
X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275 Fukazawa, Yasushi; Shiki, Kensei; Tanaka, Yasuyuki The Astrophysical Journal, Vol. 855, Issue 2 https://doi.org/10.3847/1538-4357/aaabc0	journal	March 2018
H.E.S.S. discovery of very high energy $\gamma$-ray emission from PKS 0625-354 Abdalla, H.; Abramowski, A.; Aharonian, F. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2018-01567	text	January 2018

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