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
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/22941
Ver los metadatos del registro completo
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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 Técnicas2025-10-22T12:20:44Zoai: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:34982025-10-22 12:20:44.843CONICET 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 |
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publishedVersion |
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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 |
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eng |
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openAccess |
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Edp Sciences S A |
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