Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006

We present results of the multiwavelength campaign on the TeV blazar Mkn 501 performed in 2006 July, including MAGIC for the very-high-energy (VHE) gamma-ray band and Suzaku for the X-ray band. A VHE gamma-ray signal was clearly detected with an average flux above 200 GeV of similar to 20% of the Cr...

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Detalles Bibliográficos
Autores: Antoranz Canales, Pedro, Contreras González, José Luis, Fonseca González, María Victoria, Miranda Pantoja, José Miguel, Nieto Castaño, Daniel
Tipo de recurso: artículo
Fecha de publicación:2009
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/43952
Acceso en línea:https://hdl.handle.net/20.500.14352/43952
Access Level:acceso abierto
Palabra clave:537
539.1
Active Galactic Nuclei
BL-Lacertae Objects
Gamma-Ray Observation
High-Energy Emission
X-Ray
Particle-Acceleration
LAC Objects
TEV Blazar
Galaxy Markarian-421
Physical Parameters.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
id ES_32754d2e496b8d22f2ad2b4ea498d246
oai_identifier_str oai:docta.ucm.es:20.500.14352/43952
network_acronym_str ES
network_name_str España
repository_id_str
spelling Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006Antoranz Canales, PedroContreras González, José LuisFonseca González, María VictoriaMiranda Pantoja, José MiguelNieto Castaño, Daniel537539.1Active Galactic NucleiBL-Lacertae ObjectsGamma-Ray ObservationHigh-Energy EmissionX-RayParticle-AccelerationLAC ObjectsTEV BlazarGalaxy Markarian-421Physical Parameters.Electrónica (Física)ElectricidadFísica nuclear2202.03 Electricidad2207 Física Atómica y NuclearWe present results of the multiwavelength campaign on the TeV blazar Mkn 501 performed in 2006 July, including MAGIC for the very-high-energy (VHE) gamma-ray band and Suzaku for the X-ray band. A VHE gamma-ray signal was clearly detected with an average flux above 200 GeV of similar to 20% of the Crab Nebula flux, which indicates a low state of source activity in this energy range. No significant variability has been found during the campaign. The VHE gamma-ray spectrum can be described by a simple power law from 80 GeV to 2 TeV with a photon index of 2.8 +/- 0.1, which corresponds to one of the steepest photon indices observed in this energy range so far for this object. The X-ray spectrum covers a wide range from 0.6 to 40 keV, and is well described by a broken power law, with photon indices of 2.257 +/- 0.004 and 2.420 +/- 0.012 below and above the break energy of 3.24(-0.12)(+0.13) keV. No apparent high-energy cut-off is seen above the break energy. Although an increase of the flux of about 50% is observed in the X-ray band within the observation, the data indicate a consistently low state of activity for this source. Time-resolved spectra show an evidence for spectral hardening with a flux level. A homogeneous one-zone synchrotron self-Compton (SSC) model can adequately describe the spectral energy distribution (SED) from the X-ray to the VHE gamma-ray bands with a magnetic field intensity B = 0.313 G and a Doppler beaming factor delta = 20, which are similar to the values in the past multiwavelength campaigns in high states. Based on our SSC parameters derived for the low state, we are able to reproduce the SED of the high state by just changing the Lorentz factor of the electrons corresponding to the break energy in the primary electron spectrum. This suggests that the variation of the injected electron population in the jet is responsible for the observed low-high state variation of the SED.IOP PublishingUniversidad Complutense de Madrid20092009-11-1020092009-11-10journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/43952reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/439522026-06-02T12:44:21Z
dc.title.none.fl_str_mv Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
title Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
spellingShingle Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
Antoranz Canales, Pedro
537
539.1
Active Galactic Nuclei
BL-Lacertae Objects
Gamma-Ray Observation
High-Energy Emission
X-Ray
Particle-Acceleration
LAC Objects
TEV Blazar
Galaxy Markarian-421
Physical Parameters.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
title_short Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
title_full Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
title_fullStr Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
title_full_unstemmed Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
title_sort Simultaneous multiwavelength observation of Mkn 501 in a low state in 2006
dc.creator.none.fl_str_mv Antoranz Canales, Pedro
Contreras González, José Luis
Fonseca González, María Victoria
Miranda Pantoja, José Miguel
Nieto Castaño, Daniel
author Antoranz Canales, Pedro
author_facet Antoranz Canales, Pedro
Contreras González, José Luis
Fonseca González, María Victoria
Miranda Pantoja, José Miguel
Nieto Castaño, Daniel
author_role author
author2 Contreras González, José Luis
Fonseca González, María Victoria
Miranda Pantoja, José Miguel
Nieto Castaño, Daniel
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 537
539.1
Active Galactic Nuclei
BL-Lacertae Objects
Gamma-Ray Observation
High-Energy Emission
X-Ray
Particle-Acceleration
LAC Objects
TEV Blazar
Galaxy Markarian-421
Physical Parameters.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
topic 537
539.1
Active Galactic Nuclei
BL-Lacertae Objects
Gamma-Ray Observation
High-Energy Emission
X-Ray
Particle-Acceleration
LAC Objects
TEV Blazar
Galaxy Markarian-421
Physical Parameters.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
description We present results of the multiwavelength campaign on the TeV blazar Mkn 501 performed in 2006 July, including MAGIC for the very-high-energy (VHE) gamma-ray band and Suzaku for the X-ray band. A VHE gamma-ray signal was clearly detected with an average flux above 200 GeV of similar to 20% of the Crab Nebula flux, which indicates a low state of source activity in this energy range. No significant variability has been found during the campaign. The VHE gamma-ray spectrum can be described by a simple power law from 80 GeV to 2 TeV with a photon index of 2.8 +/- 0.1, which corresponds to one of the steepest photon indices observed in this energy range so far for this object. The X-ray spectrum covers a wide range from 0.6 to 40 keV, and is well described by a broken power law, with photon indices of 2.257 +/- 0.004 and 2.420 +/- 0.012 below and above the break energy of 3.24(-0.12)(+0.13) keV. No apparent high-energy cut-off is seen above the break energy. Although an increase of the flux of about 50% is observed in the X-ray band within the observation, the data indicate a consistently low state of activity for this source. Time-resolved spectra show an evidence for spectral hardening with a flux level. A homogeneous one-zone synchrotron self-Compton (SSC) model can adequately describe the spectral energy distribution (SED) from the X-ray to the VHE gamma-ray bands with a magnetic field intensity B = 0.313 G and a Doppler beaming factor delta = 20, which are similar to the values in the past multiwavelength campaigns in high states. Based on our SSC parameters derived for the low state, we are able to reproduce the SED of the high state by just changing the Lorentz factor of the electrons corresponding to the break energy in the primary electron spectrum. This suggests that the variation of the injected electron population in the jet is responsible for the observed low-high state variation of the SED.
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-11-10
2009
2009-11-10
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/43952
url https://hdl.handle.net/20.500.14352/43952
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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