Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.

Autores
Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Anton, G.; Medina, Maria Clementina; Terrier, R.; Tluczykont, M.; Trichard, C.; Valerius, K.; van Eldik, C.; Vasileiadis, G.; Venter, C.; Viana, A.; Vincent, P.; Völk, H. J.; Volpe, F.; Vorobiov, S.; Vorster, M.; Wagner, S. J.; Ward, M.; White, R.; Wierzcholska, A.; Wouters, D.; Zacharias, N.; Zajczyk, A.; Zdziarski, A. A.; Zech, A.; Zechlin, H. S.
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV < E < 100 GeV) γ-ray radiation which could originate from the cumulative emission of the numerous millisecond pulsars (msPSRs) in the clusters’ cores or from inverse Compton (IC) scattering of relativistic leptons accelerated in the GC environment. These stellar clusters could also constitute a new class of sources in the very-high-energy (VHE, E > 100 GeV) γ-ray regime, judging from the recent detection of a signal from the direction of Terzan 5 with the H.E.S.S. telescope array. Aims. To search for VHE γ-ray sources associated with other GCs, and to put constraints on leptonic emission models, we systematically analyzed the observations towards 15 GCs taken with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes. Methods. We searched for point-like and extended VHE γ-ray emission from each GC in our sample and also performed a stacking analysis combining the data from all GCs to investigate the hypothesis of a population of faint emitters. Assuming IC emission as the origin of the VHE γ-ray signal from the direction of Terzan 5, we calculated the expected γ-ray flux from each of the 15 GCs, based on their number of millisecond pulsars, their optical brightness and the energy density of background photon fields. Results. We did not detect significant VHE γ-ray emission from any of the 15 GCs in either of the two analyses. Given the uncertainties related to the parameter determinations, the obtained flux upper limits allow to rule out the simple IC/msPSR scaling model for NGC 6388 and NGC 7078. The upper limits derived from the stacking analyses are factors between 2 and 50 below the flux predicted by the simple leptonic scaling model, depending on the assumed source extent and the dominant target photon fields. Therefore, Terzan 5 still remains exceptional among all GCs, as the VHE γ-ray emission either arises from extra-ordinarily efficient leptonic processes, or from a recent catastrophic event, or is even unrelated to the GC itself.
Fil: Abramowski, A.. Universitat Hamburg; Alemania
Fil: Acero, F.. Universite Montpellier II; Francia
Fil: Aharonian, F.. Max Planck Institut für Kernphysik; Alemania
Fil: Akhperjanian, A. G.. Yerevan Physics Institute; Armenia
Fil: Anton, G.. Universität Erlangen Nürnber; Alemania
Fil: Medina, Maria Clementina. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina
Fil: Terrier, R.. Observatoire de Paris; Francia
Fil: Tluczykont, M.. Universitat Hamburg; Alemania
Fil: Trichard, C.. Université de Savoie; Francia
Fil: Valerius, K.. Universität Erlangen Nürnber; Alemania
Fil: van Eldik, C.. Max Planck Institut für Kernphysik; Alemania
Fil: Vasileiadis, G.. Universite Montpellier II; Francia
Fil: Venter, C.. North West University; Sudáfrica
Fil: Viana, A.. Max Planck Institut für Kernphysik; Alemania
Fil: Vincent, P.. Université Paris Diderot - Paris 7; Francia
Fil: Völk, H. J.. Max Planck Institut für Kernphysik; Alemania
Fil: Volpe, F.. Max Planck Institut für Kernphysik; Alemania
Fil: Vorobiov, S.. Universite Montpellier II; Francia
Fil: Vorster, M.. North West University; Sudáfrica
Fil: Wagner, S. J.. Universität Heidelberg; Alemania
Fil: Ward, M.. University Of Durham; Reino Unido
Fil: White, R.. University of Leicester; Reino Unido
Fil: Wierzcholska, A.. Uniwersytet Jagiellonski; Polonia
Fil: Wouters, D.. CEA Saclay; Francia
Fil: Zacharias, N.. Ruhr-universität Bochum; Alemania
Fil: Zajczyk, A.. Nicolaus Copernicus Astronomical Center; Polonia
Fil: Zdziarski, A. A.. Nicolaus Copernicus Astronomical Center; Polonia
Fil: Zech, A.. Université Paris Diderot - Paris 7; Francia
Fil: Zechlin, H. S.. Universitat Hamburg; Alemania
Materia
Globular clusters
Radiation mechanisms
Pulsars
Gamma rays
Non thermal mechanisms
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:11336/22941

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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.Abramowski, A.Acero, F.Aharonian, F.Akhperjanian, A. G.Anton, G.Medina, Maria ClementinaTerrier, R.Tluczykont, M.Trichard, C.Valerius, K.van Eldik, C.Vasileiadis, G.Venter, C.Viana, A.Vincent, P.Völk, H. J.Volpe, F.Vorobiov, S.Vorster, M.Wagner, S. J.Ward, M.White, R.Wierzcholska, A.Wouters, D.Zacharias, N.Zajczyk, A.Zdziarski, A. A.Zech, A.Zechlin, H. S.Globular clustersRadiation mechanismsPulsarsGamma raysNon thermal mechanismshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV < E < 100 GeV) γ-ray radiation which could originate from the cumulative emission of the numerous millisecond pulsars (msPSRs) in the clusters’ cores or from inverse Compton (IC) scattering of relativistic leptons accelerated in the GC environment. These stellar clusters could also constitute a new class of sources in the very-high-energy (VHE, E > 100 GeV) γ-ray regime, judging from the recent detection of a signal from the direction of Terzan 5 with the H.E.S.S. telescope array. Aims. To search for VHE γ-ray sources associated with other GCs, and to put constraints on leptonic emission models, we systematically analyzed the observations towards 15 GCs taken with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes. Methods. We searched for point-like and extended VHE γ-ray emission from each GC in our sample and also performed a stacking analysis combining the data from all GCs to investigate the hypothesis of a population of faint emitters. Assuming IC emission as the origin of the VHE γ-ray signal from the direction of Terzan 5, we calculated the expected γ-ray flux from each of the 15 GCs, based on their number of millisecond pulsars, their optical brightness and the energy density of background photon fields. Results. We did not detect significant VHE γ-ray emission from any of the 15 GCs in either of the two analyses. Given the uncertainties related to the parameter determinations, the obtained flux upper limits allow to rule out the simple IC/msPSR scaling model for NGC 6388 and NGC 7078. The upper limits derived from the stacking analyses are factors between 2 and 50 below the flux predicted by the simple leptonic scaling model, depending on the assumed source extent and the dominant target photon fields. Therefore, Terzan 5 still remains exceptional among all GCs, as the VHE γ-ray emission either arises from extra-ordinarily efficient leptonic processes, or from a recent catastrophic event, or is even unrelated to the GC itself.Fil: Abramowski, A.. Universitat Hamburg; AlemaniaFil: Acero, F.. Universite Montpellier II; FranciaFil: Aharonian, F.. Max Planck Institut für Kernphysik; AlemaniaFil: Akhperjanian, A. G.. Yerevan Physics Institute; ArmeniaFil: Anton, G.. Universität Erlangen Nürnber; AlemaniaFil: Medina, Maria Clementina. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; ArgentinaFil: Terrier, R.. Observatoire de Paris; FranciaFil: Tluczykont, M.. Universitat Hamburg; AlemaniaFil: Trichard, C.. Université de Savoie; FranciaFil: Valerius, K.. Universität Erlangen Nürnber; AlemaniaFil: van Eldik, C.. Max Planck Institut für Kernphysik; AlemaniaFil: Vasileiadis, G.. Universite Montpellier II; FranciaFil: Venter, C.. North West University; SudáfricaFil: Viana, A.. Max Planck Institut für Kernphysik; AlemaniaFil: Vincent, P.. Université Paris Diderot - Paris 7; FranciaFil: Völk, H. J.. Max Planck Institut für Kernphysik; AlemaniaFil: Volpe, F.. Max Planck Institut für Kernphysik; AlemaniaFil: Vorobiov, S.. Universite Montpellier II; FranciaFil: Vorster, M.. North West University; SudáfricaFil: Wagner, S. J.. Universität Heidelberg; AlemaniaFil: Ward, M.. University Of Durham; Reino UnidoFil: White, R.. University of Leicester; Reino UnidoFil: Wierzcholska, A.. Uniwersytet Jagiellonski; PoloniaFil: Wouters, D.. CEA Saclay; FranciaFil: Zacharias, N.. Ruhr-universität Bochum; AlemaniaFil: Zajczyk, A.. Nicolaus Copernicus Astronomical Center; PoloniaFil: Zdziarski, A. A.. Nicolaus Copernicus Astronomical Center; PoloniaFil: Zech, A.. Université Paris Diderot - Paris 7; FranciaFil: Zechlin, H. S.. Universitat Hamburg; AlemaniaEdp Sciences S A2013-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/22941Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Anton, G.; et al.; Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.; Edp Sciences S A; Astronomy And Astrophysics; 551; 3-2013; 26-340004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/03/aa20719-12/aa20719-12.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201220719info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:47:19Zoai:ri.conicet.gov.ar:11336/22941instacron: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 10:47:19.884CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
title Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
spellingShingle Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
Abramowski, A.
Globular clusters
Radiation mechanisms
Pulsars
Gamma rays
Non thermal mechanisms
title_short Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
title_full Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
title_fullStr Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
title_full_unstemmed Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
title_sort Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.
dc.creator.none.fl_str_mv Abramowski, A.
Acero, F.
Aharonian, F.
Akhperjanian, A. G.
Anton, G.
Medina, Maria Clementina
Terrier, R.
Tluczykont, M.
Trichard, C.
Valerius, K.
van Eldik, C.
Vasileiadis, G.
Venter, C.
Viana, A.
Vincent, P.
Völk, H. J.
Volpe, F.
Vorobiov, S.
Vorster, M.
Wagner, S. J.
Ward, M.
White, R.
Wierzcholska, A.
Wouters, D.
Zacharias, N.
Zajczyk, A.
Zdziarski, A. A.
Zech, A.
Zechlin, H. S.
author Abramowski, A.
author_facet Abramowski, A.
Acero, F.
Aharonian, F.
Akhperjanian, A. G.
Anton, G.
Medina, Maria Clementina
Terrier, R.
Tluczykont, M.
Trichard, C.
Valerius, K.
van Eldik, C.
Vasileiadis, G.
Venter, C.
Viana, A.
Vincent, P.
Völk, H. J.
Volpe, F.
Vorobiov, S.
Vorster, M.
Wagner, S. J.
Ward, M.
White, R.
Wierzcholska, A.
Wouters, D.
Zacharias, N.
Zajczyk, A.
Zdziarski, A. A.
Zech, A.
Zechlin, H. S.
author_role author
author2 Acero, F.
Aharonian, F.
Akhperjanian, A. G.
Anton, G.
Medina, Maria Clementina
Terrier, R.
Tluczykont, M.
Trichard, C.
Valerius, K.
van Eldik, C.
Vasileiadis, G.
Venter, C.
Viana, A.
Vincent, P.
Völk, H. J.
Volpe, F.
Vorobiov, S.
Vorster, M.
Wagner, S. J.
Ward, M.
White, R.
Wierzcholska, A.
Wouters, D.
Zacharias, N.
Zajczyk, A.
Zdziarski, A. A.
Zech, A.
Zechlin, H. S.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Globular clusters
Radiation mechanisms
Pulsars
Gamma rays
Non thermal mechanisms
topic Globular clusters
Radiation mechanisms
Pulsars
Gamma rays
Non thermal mechanisms
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV < E < 100 GeV) γ-ray radiation which could originate from the cumulative emission of the numerous millisecond pulsars (msPSRs) in the clusters’ cores or from inverse Compton (IC) scattering of relativistic leptons accelerated in the GC environment. These stellar clusters could also constitute a new class of sources in the very-high-energy (VHE, E > 100 GeV) γ-ray regime, judging from the recent detection of a signal from the direction of Terzan 5 with the H.E.S.S. telescope array. Aims. To search for VHE γ-ray sources associated with other GCs, and to put constraints on leptonic emission models, we systematically analyzed the observations towards 15 GCs taken with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes. Methods. We searched for point-like and extended VHE γ-ray emission from each GC in our sample and also performed a stacking analysis combining the data from all GCs to investigate the hypothesis of a population of faint emitters. Assuming IC emission as the origin of the VHE γ-ray signal from the direction of Terzan 5, we calculated the expected γ-ray flux from each of the 15 GCs, based on their number of millisecond pulsars, their optical brightness and the energy density of background photon fields. Results. We did not detect significant VHE γ-ray emission from any of the 15 GCs in either of the two analyses. Given the uncertainties related to the parameter determinations, the obtained flux upper limits allow to rule out the simple IC/msPSR scaling model for NGC 6388 and NGC 7078. The upper limits derived from the stacking analyses are factors between 2 and 50 below the flux predicted by the simple leptonic scaling model, depending on the assumed source extent and the dominant target photon fields. Therefore, Terzan 5 still remains exceptional among all GCs, as the VHE γ-ray emission either arises from extra-ordinarily efficient leptonic processes, or from a recent catastrophic event, or is even unrelated to the GC itself.
Fil: Abramowski, A.. Universitat Hamburg; Alemania
Fil: Acero, F.. Universite Montpellier II; Francia
Fil: Aharonian, F.. Max Planck Institut für Kernphysik; Alemania
Fil: Akhperjanian, A. G.. Yerevan Physics Institute; Armenia
Fil: Anton, G.. Universität Erlangen Nürnber; Alemania
Fil: Medina, Maria Clementina. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina
Fil: Terrier, R.. Observatoire de Paris; Francia
Fil: Tluczykont, M.. Universitat Hamburg; Alemania
Fil: Trichard, C.. Université de Savoie; Francia
Fil: Valerius, K.. Universität Erlangen Nürnber; Alemania
Fil: van Eldik, C.. Max Planck Institut für Kernphysik; Alemania
Fil: Vasileiadis, G.. Universite Montpellier II; Francia
Fil: Venter, C.. North West University; Sudáfrica
Fil: Viana, A.. Max Planck Institut für Kernphysik; Alemania
Fil: Vincent, P.. Université Paris Diderot - Paris 7; Francia
Fil: Völk, H. J.. Max Planck Institut für Kernphysik; Alemania
Fil: Volpe, F.. Max Planck Institut für Kernphysik; Alemania
Fil: Vorobiov, S.. Universite Montpellier II; Francia
Fil: Vorster, M.. North West University; Sudáfrica
Fil: Wagner, S. J.. Universität Heidelberg; Alemania
Fil: Ward, M.. University Of Durham; Reino Unido
Fil: White, R.. University of Leicester; Reino Unido
Fil: Wierzcholska, A.. Uniwersytet Jagiellonski; Polonia
Fil: Wouters, D.. CEA Saclay; Francia
Fil: Zacharias, N.. Ruhr-universität Bochum; Alemania
Fil: Zajczyk, A.. Nicolaus Copernicus Astronomical Center; Polonia
Fil: Zdziarski, A. A.. Nicolaus Copernicus Astronomical Center; Polonia
Fil: Zech, A.. Université Paris Diderot - Paris 7; Francia
Fil: Zechlin, H. S.. Universitat Hamburg; Alemania
description Context. Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV < E < 100 GeV) γ-ray radiation which could originate from the cumulative emission of the numerous millisecond pulsars (msPSRs) in the clusters’ cores or from inverse Compton (IC) scattering of relativistic leptons accelerated in the GC environment. These stellar clusters could also constitute a new class of sources in the very-high-energy (VHE, E > 100 GeV) γ-ray regime, judging from the recent detection of a signal from the direction of Terzan 5 with the H.E.S.S. telescope array. Aims. To search for VHE γ-ray sources associated with other GCs, and to put constraints on leptonic emission models, we systematically analyzed the observations towards 15 GCs taken with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes. Methods. We searched for point-like and extended VHE γ-ray emission from each GC in our sample and also performed a stacking analysis combining the data from all GCs to investigate the hypothesis of a population of faint emitters. Assuming IC emission as the origin of the VHE γ-ray signal from the direction of Terzan 5, we calculated the expected γ-ray flux from each of the 15 GCs, based on their number of millisecond pulsars, their optical brightness and the energy density of background photon fields. Results. We did not detect significant VHE γ-ray emission from any of the 15 GCs in either of the two analyses. Given the uncertainties related to the parameter determinations, the obtained flux upper limits allow to rule out the simple IC/msPSR scaling model for NGC 6388 and NGC 7078. The upper limits derived from the stacking analyses are factors between 2 and 50 below the flux predicted by the simple leptonic scaling model, depending on the assumed source extent and the dominant target photon fields. Therefore, Terzan 5 still remains exceptional among all GCs, as the VHE γ-ray emission either arises from extra-ordinarily efficient leptonic processes, or from a recent catastrophic event, or is even unrelated to the GC itself.
publishDate 2013
dc.date.none.fl_str_mv 2013-03
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/11336/22941
Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Anton, G.; et al.; Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.; Edp Sciences S A; Astronomy And Astrophysics; 551; 3-2013; 26-34
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/22941
identifier_str_mv Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Anton, G.; et al.; Search for very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S.; Edp Sciences S A; Astronomy And Astrophysics; 551; 3-2013; 26-34
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/03/aa20719-12/aa20719-12.html
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201220719
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 Edp Sciences S A
publisher.none.fl_str_mv Edp Sciences S A
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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