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dc.contributor.author
Abramowski, A.
dc.contributor.author
Aharonian, Felix A.
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Akhperjanian, A. G.
dc.contributor.author
Anton, G.
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Balenderan, S.
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Balzer, A.
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Barnacka, A.
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Becherini, Y.
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Becker Tjus, J.
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Bernlöhr, K.
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Birsin, E.
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Bochow, A.
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Boisson, C.
dc.contributor.author
Bolmont, J.
dc.contributor.author
Boisson, C.
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Bolmont, J.
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Brun, P.
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Brun, F.
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Casanova, S.
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Cerruti, M.
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Chadwick, P.M.
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Charbonnier, A.
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Chaves, R.C.G.
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Cheesebrough, A.
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Cologna, G.
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Medina, Maria Clementina
dc.date.available
2018-03-26T14:28:44Z
dc.date.issued
2012-12
dc.identifier.citation
Abramowski, A.; Aharonian, Felix A.; Akhperjanian, A. G.; Anton, G.; Balenderan, S.; et al.; Probing the extent of the non-thermal emission from the Vela X region at TeV energies with H.E.S.S.; EDP Sciences; Astronomy and Astrophysics; 548; 12-2012
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/39888
dc.description.abstract
Context. Vela X is a region of extended radio emission in the western part of the Vela constellation: one of the nearest pulsar wind nebulae, and associated with the energetic Vela pulsar (PSR B0833-45). Extended very-high-energy (VHE) γ-ray emission (HESS J0835-455) was discovered using the H.E.S.S. experiment in 2004. The VHE γ-ray emission was found to be coincident with a region of X-ray emission discovered with ROSAT above 1.5 keV (the so-called Vela X cocoon): a filamentary structure extending southwest from the pulsar to the centre of Vela X. Aims. A deeper observation of the entire Vela X nebula region, also including larger offsets from the cocoon, has been performed with H.E.S.S. This re-observation was carried out in order to probe the extent of the non-thermal emission from the Vela X region at TeV energies and to investigate its spectral properties. Methods. To increase the sensitivity to the faint γ-ray emission from the very extended Vela X region, a multivariate analysis method combining three complementary reconstruction techniques of Cherenkov-shower images is applied for the selection of γ-ray events. The analysis is performed with the On/Off background method, which estimates the background from separate observations pointing away from Vela X; towards regions free of γ-ray sources but with comparable observation conditions. Results. The γ-ray surface brightness over the large Vela X region reveals that the detection of non-thermal VHE γ-ray emission from the PWN HESS J0835-455 is statistically significant over a region of radius 1.2° around the position α = 08 h35m00s, δ = - 45°36′00′′ (J2000). The Vela X region exhibits almost uniform γ-ray spectra over its full extent: the differential energy spectrum can be described by a power-law function with a hard spectral index Γ = 1.32 ± 0.06stat ± 0.12sys and an exponential cutoff at an energy of (14.0 ± 1.6stat ± 2.6sys) TeV. Compared to the previous H.E.S.S. observations of Vela X the new analysis confirms the general spatial overlap of the bulk of the VHE γ-ray emission with the X-ray cocoon, while its extent and morphology appear more consistent with the (more extended) radio emission, contradicting the simple correspondence between VHE γ-ray and X-ray emissions. Morphological and spectral results challenge the interpretation of the origin of γ-ray emission in the GeV and TeV ranges in the framework of current models. © ESO, 2012.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights
Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5 AR)
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Radiation Mechanisms
dc.subject
Vela X (Pulsar)
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Hess J0835–455
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Gamma Rays
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Non Thermal Mechanisms
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Probing the extent of the non-thermal emission from the Vela X region at TeV energies with H.E.S.S.
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-15T17:05:04Z
dc.journal.volume
548
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Abramowski, A.. Universitat Hamburg; Alemania
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Fil: Aharonian, Felix A.. Max Planck Institut Fur Kernphysik; Alemania
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Fil: Akhperjanian, A. G.. National Academy Of Sciences Of The Republic Of Armenia; Armenia. Yerevan Physics Institute; Armenia
dc.description.fil
Fil: Anton, G.. Universitat Erlangen-Nuremberg; Alemania
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Fil: Balenderan, S.. University Of Durham; Reino Unido
dc.description.fil
Fil: Balzer, A.. Universitat Erlangen-Nuremberg; Alemania
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Fil: Barnacka, A.. CEA Saclay; Francia
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Fil: Becherini, Y.. Université Paris Diderot - Paris 7; Francia
dc.description.fil
Fil: Becker Tjus, J.. Ruhr Universität Bochum; Alemania
dc.description.fil
Fil: Bernlöhr, K.. Max Planck Institut Fur Kernphysik; Alemania
dc.description.fil
Fil: Birsin, E.. Humboldt-universitat Zu Berlin; Alemania
dc.description.fil
Fil: Bochow, A.. Max Planck Institut Fur Kernphysik; Alemania
dc.description.fil
Fil: Boisson, C.. Université Paris Diderot - Paris 7; Francia
dc.description.fil
Fil: Bolmont, J.. Max Planck Institut Fur Kernphysik; Alemania
dc.description.fil
Fil: Boisson, C.. Université Paris Diderot - Paris 7; Francia
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Fil: Bolmont, J.. Universite Pierre et Marie Curie; Francia
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Fil: Brun, P.. Cea Saclay;
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Fil: Brun, F.. Laboratoire Leprince-ringuet; Francia
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Fil: Casanova, S.. Max Planck Institut Fur Kernphysik; Alemania
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Fil: Cerruti, M.. Université Paris Diderot - Paris 7; Francia
dc.description.fil
Fil: Chadwick, P.M.. University Of Durham; Reino Unido
dc.description.fil
Fil: Charbonnier, A.. Universite Pierre et Marie Curie; Francia
dc.description.fil
Fil: Chaves, R.C.G.. Cea Saclay; Francia. Max Planck Institut Fur Kernphysik; Alemania
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Fil: Cheesebrough, A.. University Of Durham; Reino Unido
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Fil: Cologna, G.. Landessternwarte Heidelberg; Alemania
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Fil: Medina, Maria Clementina. Cea Saclay; Francia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
dc.journal.title
Astronomy and Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2012/12/aa19919-12/aa19919-12.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201219919
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