Suzaku observations of γ-ray bright radio galaxies: Origin of the x-ray emission and broadband modeling
Abstract
Here, 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 tomore »
- Authors:
-
[3];
[1];
- Hiroshima Univ., Hiroshima (Japan)
- U.S. Naval Research Lab., Washington, D.C. (United States)
- Institute of Space and Astronautical Science, Kanagawa (Japan); Jagiellonian Univ., Krakow (Poland)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1356348
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 798; Journal Issue: 2; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: jets; gamma rays: galaxies; X-rays: galaxies
Citation Formats
Fukazawa, Yasushi, Finke, Justin, Stawarz, Łukasz, Tanaka, Yasuyuki, Itoh, Ryosuke, and Tokuda, Shin'ya. Suzaku observations of γ-ray bright radio galaxies: Origin of the x-ray emission and broadband modeling. United States: N. p., 2014.
Web. doi:10.1088/0004-637X/798/2/74.
Fukazawa, Yasushi, Finke, Justin, Stawarz, Łukasz, Tanaka, Yasuyuki, Itoh, Ryosuke, & Tokuda, Shin'ya. Suzaku observations of γ-ray bright radio galaxies: Origin of the x-ray emission and broadband modeling. United States. https://doi.org/10.1088/0004-637X/798/2/74
Fukazawa, Yasushi, Finke, Justin, Stawarz, Łukasz, Tanaka, Yasuyuki, Itoh, Ryosuke, and Tokuda, Shin'ya. Wed .
"Suzaku observations of γ-ray bright radio galaxies: Origin of the x-ray emission and broadband modeling". United States. https://doi.org/10.1088/0004-637X/798/2/74. https://www.osti.gov/servlets/purl/1356348.
@article{osti_1356348,
title = {Suzaku observations of γ-ray bright radio galaxies: Origin of the x-ray emission and broadband modeling},
author = {Fukazawa, Yasushi and Finke, Justin and Stawarz, Łukasz and Tanaka, Yasuyuki and Itoh, Ryosuke and Tokuda, Shin'ya},
abstractNote = {Here, 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 (~1016 Hz) synchrotron frequencies in the two analyzed sources, contrary to previously suggested scenarios for Fanaroff-Riley (FR) type I/BL Lac unification. Finally, we discuss the implications of our findings in the context of the FR I/BL Lac unification schemes.},
doi = {10.1088/0004-637X/798/2/74},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 798,
place = {United States},
year = {Wed Dec 24 00:00:00 EST 2014},
month = {Wed Dec 24 00:00:00 EST 2014}
}
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- Takeuchi, Y.; Kataoka, J.; Stawarz, L.
- arXiv
XMM-Newton observation of M87 I. Single-phase temperature structure of intracluster medium
text, January 2002
- Matsushita, Kyoko; Belsole, Elena; Finoguenov, Alexis
- arXiv
The black hole mass of low redshift radiogalaxies
text, January 2002
- Bettoni, D.; Falomo, R.; Fasano, G.
- arXiv
Emission lines and optical continuum in low-luminosity radio galaxies
text, January 2003
- Wills, K. A.; Morganti, R.; Tadhunter, C. N.
- arXiv
A sample of radio galaxies spanning three decades in radio luminosity - I. The host-galaxy properties and black-hole masses
text, January 2004
- McLure, Ross J.; Willott, Chris J.; Jarvis, Matt J.
- arXiv
Chandra and XMM-Newton Observations of the Nucleus of Centaurus A
text, January 2004
- Evans, D. A.; Kraft, R. P.; Worrall, D. M.
- arXiv
ASCA Compilation of X-Ray Properties of Hot Gas in Elliptical Galaxies and Galaxy Clusters: Two Breaks in the Temperature Dependences
text, January 2004
- Fukazawa, Yasushi; Makishima, Kazuo; Ohashi, Takaya
- arXiv
The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
text, January 2005
- Kalberla, P. M. W.; Burton, W. B.; Hartmann, Dap
- arXiv
Scaling Mass Profiles around Elliptical Galaxies Observed with Chandra and XMM-Newton
text, January 2005
- Fukazawa, Y.; Betoya-Nonesa, J. G.; Pu, J.
- arXiv
The Hot Interstellar Medium of Normal Elliptical Galaxies. I. A Chandra Gas Gallery and Comparison of X-ray and Optical Morphology
text, January 2006
- Diehl, Steven; Statler, Thomas S.
- arXiv
Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
text, January 2006
- Ishisaki, Y.; Maeda, Y.; Fujimoto, R.
- arXiv
Hot and cold gas accretion and feedback in radio-loud active galaxies
text, January 2007
- Hardcastle, M. J.; Evans, D. A.; Croston, J. H.
- arXiv
ROSAT X-ray observations of 3CRR radio sources
text, January 1999
- Hardcastle, M. J.; Worrall, D. M.
- arXiv
Works referencing / citing this record:
H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354
journal, February 2018
- Abdalla, H.; Abramowski, A.; Aharonian, F.
- Monthly Notices of the Royal Astronomical Society, Vol. 476, Issue 3
X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275
journal, March 2018
- Fukazawa, Yasushi; Shiki, Kensei; Tanaka, Yasuyuki
- The Astrophysical Journal, Vol. 855, Issue 2
H.E.S.S. discovery of very high energy $\gamma$-ray emission from PKS 0625-354
text, January 2018
- Abdalla, H.; Abramowski, A.; Aharonian, F.
- Deutsches Elektronen-Synchrotron, DESY, Hamburg