Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS

Autores
Ahnen, M. L..; Pichel, Ana Carolina; Rovero, Adrian Carlos
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present very-high-energy γ-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above background of 20.8σ in 47.2 hours (livetime) of observations, making this the most comprehensive very-high-energy study of 1ES 2344+514 to date. Using these observations the temporal properties of 1ES 2344+514 are studied on short and long times scales. We fit a constant flux model to nightly- and seasonally-binned light curves and apply a fractional variability test, to determine the stability of the source on different timescales. We reject the constant-flux model for the 2007-2008 and 2014-2015 nightly-binned light curves and for the long-term seasonally-binned light curve at the > 3σ level. The spectra of the time-averaged emission before and after correc-
tion for attenuation by the extragalactic background light are obtained. The observed time-averaged spectrum above 200 GeV is satisfactorily fitted (χ*2 /NDF = 7.89/6) by a power-law function with index Γ = 2.46 ± 0.06 stat ± 0.20 sys and extends to at least 8 TeV. The extragalactic-background-light-deabsorbed spectrum is adequately fit (χ*2 /NDF = 6.73/6) by a power-law function with index Γ = 2.15 ± 0.06 stat ± 0.20 sys while an F-test indicates that the power-law with exponential cutoff function provides a marginally-better fit (χ 2 /N DF = 2.56/5) at the 2.1σ level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.
Fil: Ahnen, M. L... Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Rovero, Adrian Carlos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Materia
ASTROPARTICLE PHYSICS
GAMMA-RAYS: GALAXIES
BL LACERTAE OBJECTS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/42453
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/42453
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITASAhnen, M. L..Pichel, Ana CarolinaRovero, Adrian CarlosASTROPARTICLE PHYSICSGAMMA-RAYS: GALAXIESBL LACERTAE OBJECTShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present very-high-energy γ-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above background of 20.8σ in 47.2 hours (livetime) of observations, making this the most comprehensive very-high-energy study of 1ES 2344+514 to date. Using these observations the temporal properties of 1ES 2344+514 are studied on short and long times scales. We fit a constant flux model to nightly- and seasonally-binned light curves and apply a fractional variability test, to determine the stability of the source on different timescales. We reject the constant-flux model for the 2007-2008 and 2014-2015 nightly-binned light curves and for the long-term seasonally-binned light curve at the > 3σ level. The spectra of the time-averaged emission before and after correc-<br />tion for attenuation by the extragalactic background light are obtained. The observed time-averaged spectrum above 200 GeV is satisfactorily fitted (χ*2 /NDF = 7.89/6) by a power-law function with index Γ = 2.46 ± 0.06 stat ± 0.20 sys and extends to at least 8 TeV. The extragalactic-background-light-deabsorbed spectrum is adequately fit (χ*2 /NDF = 6.73/6) by a power-law function with index Γ = 2.15 ± 0.06 stat ± 0.20 sys while an F-test indicates that the power-law with exponential cutoff function provides a marginally-better fit (χ 2 /N DF = 2.56/5) at the 2.1σ level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.Fil: Ahnen, M. L... Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Pichel, Ana Carolina. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Rovero, Adrian Carlos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaWiley Blackwell Publishing, Inc2017-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/42453Ahnen, M. L..; Pichel, Ana Carolina; Rovero, Adrian Carlos; Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 471; 10-2017; 2117-21230035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stx1756info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:33:47Zoai:ri.conicet.gov.ar:11336/42453instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:33:47.41CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
title Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
spellingShingle Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
Ahnen, M. L..
ASTROPARTICLE PHYSICS
GAMMA-RAYS: GALAXIES
BL LACERTAE OBJECTS
title_short Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
title_full Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
title_fullStr Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
title_full_unstemmed Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
title_sort Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
dc.creator.none.fl_str_mv Ahnen, M. L..
Pichel, Ana Carolina
Rovero, Adrian Carlos
author Ahnen, M. L..
author_facet Ahnen, M. L..
Pichel, Ana Carolina
Rovero, Adrian Carlos
author_role author
author2 Pichel, Ana Carolina
Rovero, Adrian Carlos
author2_role author
author
dc.subject.none.fl_str_mv ASTROPARTICLE PHYSICS
GAMMA-RAYS: GALAXIES
BL LACERTAE OBJECTS
topic ASTROPARTICLE PHYSICS
GAMMA-RAYS: GALAXIES
BL LACERTAE OBJECTS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We present very-high-energy γ-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above background of 20.8σ in 47.2 hours (livetime) of observations, making this the most comprehensive very-high-energy study of 1ES 2344+514 to date. Using these observations the temporal properties of 1ES 2344+514 are studied on short and long times scales. We fit a constant flux model to nightly- and seasonally-binned light curves and apply a fractional variability test, to determine the stability of the source on different timescales. We reject the constant-flux model for the 2007-2008 and 2014-2015 nightly-binned light curves and for the long-term seasonally-binned light curve at the > 3σ level. The spectra of the time-averaged emission before and after correc-<br />tion for attenuation by the extragalactic background light are obtained. The observed time-averaged spectrum above 200 GeV is satisfactorily fitted (χ*2 /NDF = 7.89/6) by a power-law function with index Γ = 2.46 ± 0.06 stat ± 0.20 sys and extends to at least 8 TeV. The extragalactic-background-light-deabsorbed spectrum is adequately fit (χ*2 /NDF = 6.73/6) by a power-law function with index Γ = 2.15 ± 0.06 stat ± 0.20 sys while an F-test indicates that the power-law with exponential cutoff function provides a marginally-better fit (χ 2 /N DF = 2.56/5) at the 2.1σ level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.
Fil: Ahnen, M. L... Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Rovero, Adrian Carlos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
description We present very-high-energy γ-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above background of 20.8σ in 47.2 hours (livetime) of observations, making this the most comprehensive very-high-energy study of 1ES 2344+514 to date. Using these observations the temporal properties of 1ES 2344+514 are studied on short and long times scales. We fit a constant flux model to nightly- and seasonally-binned light curves and apply a fractional variability test, to determine the stability of the source on different timescales. We reject the constant-flux model for the 2007-2008 and 2014-2015 nightly-binned light curves and for the long-term seasonally-binned light curve at the > 3σ level. The spectra of the time-averaged emission before and after correc-<br />tion for attenuation by the extragalactic background light are obtained. The observed time-averaged spectrum above 200 GeV is satisfactorily fitted (χ*2 /NDF = 7.89/6) by a power-law function with index Γ = 2.46 ± 0.06 stat ± 0.20 sys and extends to at least 8 TeV. The extragalactic-background-light-deabsorbed spectrum is adequately fit (χ*2 /NDF = 6.73/6) by a power-law function with index Γ = 2.15 ± 0.06 stat ± 0.20 sys while an F-test indicates that the power-law with exponential cutoff function provides a marginally-better fit (χ 2 /N DF = 2.56/5) at the 2.1σ level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.
publishDate 2017
dc.date.none.fl_str_mv 2017-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/42453
Ahnen, M. L..; Pichel, Ana Carolina; Rovero, Adrian Carlos; Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 471; 10-2017; 2117-2123
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42453
identifier_str_mv Ahnen, M. L..; Pichel, Ana Carolina; Rovero, Adrian Carlos; Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 471; 10-2017; 2117-2123
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stx1756
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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