Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007

Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra of the source can be well-described with single power-law models in both exposures. The derived X-ray photon index and the...

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Autores: Bosch i Ramon, Valentí, Paredes i Poy, Josep Maria, Ribó Gomis, Marc
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2009
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/99902
Acesso em linha:https://hdl.handle.net/2445/99902
Access Level:acceso abierto
Palavra-chave:Galàxies
Raigs X
Forats negres (Astronomia)
Galaxies
X-rays
Black holes (Astronomy)
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spelling Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007Bosch i Ramon, ValentíParedes i Poy, Josep MariaRibó Gomis, MarcGalàxiesRaigs XForats negres (Astronomia)GalaxiesX-raysBlack holes (Astronomy)Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra of the source can be well-described with single power-law models in both exposures. The derived X-ray photon index and the flux density at 1 keV were found to be Γ = 1.65±0.02 and S1keV = 215±5 nJy in the quiescent state. In the flaring state, the source exhibited a harder X-ray spectrum (Γ = 1.50±0.01) with a nearly doubled X-ray flux density of S1keV = 404+6-5nJy. Moreover, significant hard X-ray signals were detected up to 27 keV. In cooperation with Suzaku, simultaneous radio, optical, and very-high-energy γ-ray observations of OJ 287 were performed with the Nobeyama Millimeter Array, the KANATA telescope, and the MAGIC telescope, respectively. The radio and optical fluxes in the flaring state (3.04±0.46 Jy and 8.93±0.05 mJy at 86.75 Hz and in the V-band, respectively) were found to be higher by a factor of 2-3 than those in the quiescent state (1.73±0.26 Jy and 3.03±0.01 mJy at 86.75 Hz and in the V-band, respectively). No notable γ-ray events were detected in either observation. The spectral energy distribution of OJ 287 indicated that the X-ray spectrum was dominated by inverse Compton radiation in both observations, while synchrotron radiation exhibited a spectral cutoff at around the optical frequency. Furthermore, no significant difference in the synchrotron cutoff frequency was found between the quiescent and flaring states. According to a simple synchrotron self-Compton model, the change of the spectral energy distribution is due to an increase in the energy density of electrons with small changes of both the magnetic field strength and the maximum Lorentz factor of electrons.Astronomical Society of Japan2016201620092016info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion12 p.application/pdfhttps://hdl.handle.net/2445/99902Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: http://dx.doi.org/10.1093/pasj/61.5.1011Publications of the Astronomical Society of Japan, 2009, vol. 61, num. 5, p. 1011-1022http://dx.doi.org/10.1093/pasj/61.5.1011(c) Bosch i Ramon, Valentí et al., 2009info:eu-repo/semantics/openAccessoai:recercat.cat:2445/999022026-05-29T05:05:01Z
dc.title.none.fl_str_mv Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
title Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
spellingShingle Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
Bosch i Ramon, Valentí
Galàxies
Raigs X
Forats negres (Astronomia)
Galaxies
X-rays
Black holes (Astronomy)
title_short Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
title_full Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
title_fullStr Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
title_full_unstemmed Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
title_sort Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
dc.creator.none.fl_str_mv Bosch i Ramon, Valentí
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
author Bosch i Ramon, Valentí
author_facet Bosch i Ramon, Valentí
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
author_role author
author2 Paredes i Poy, Josep Maria
Ribó Gomis, Marc
author2_role author
author
dc.subject.none.fl_str_mv Galàxies
Raigs X
Forats negres (Astronomia)
Galaxies
X-rays
Black holes (Astronomy)
topic Galàxies
Raigs X
Forats negres (Astronomia)
Galaxies
X-rays
Black holes (Astronomy)
description Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra of the source can be well-described with single power-law models in both exposures. The derived X-ray photon index and the flux density at 1 keV were found to be Γ = 1.65±0.02 and S1keV = 215±5 nJy in the quiescent state. In the flaring state, the source exhibited a harder X-ray spectrum (Γ = 1.50±0.01) with a nearly doubled X-ray flux density of S1keV = 404+6-5nJy. Moreover, significant hard X-ray signals were detected up to 27 keV. In cooperation with Suzaku, simultaneous radio, optical, and very-high-energy γ-ray observations of OJ 287 were performed with the Nobeyama Millimeter Array, the KANATA telescope, and the MAGIC telescope, respectively. The radio and optical fluxes in the flaring state (3.04±0.46 Jy and 8.93±0.05 mJy at 86.75 Hz and in the V-band, respectively) were found to be higher by a factor of 2-3 than those in the quiescent state (1.73±0.26 Jy and 3.03±0.01 mJy at 86.75 Hz and in the V-band, respectively). No notable γ-ray events were detected in either observation. The spectral energy distribution of OJ 287 indicated that the X-ray spectrum was dominated by inverse Compton radiation in both observations, while synchrotron radiation exhibited a spectral cutoff at around the optical frequency. Furthermore, no significant difference in the synchrotron cutoff frequency was found between the quiescent and flaring states. According to a simple synchrotron self-Compton model, the change of the spectral energy distribution is due to an increase in the energy density of electrons with small changes of both the magnetic field strength and the maximum Lorentz factor of electrons.
publishDate 2009
dc.date.none.fl_str_mv 2009
2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/99902
url https://hdl.handle.net/2445/99902
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: http://dx.doi.org/10.1093/pasj/61.5.1011
Publications of the Astronomical Society of Japan, 2009, vol. 61, num. 5, p. 1011-1022
http://dx.doi.org/10.1093/pasj/61.5.1011
dc.rights.none.fl_str_mv (c) Bosch i Ramon, Valentí et al., 2009
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Bosch i Ramon, Valentí et al., 2009
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 12 p.
application/pdf
dc.publisher.none.fl_str_mv Astronomical Society of Japan
publisher.none.fl_str_mv Astronomical Society of Japan
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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