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- Abramowski, A. (author)
HESS observations of the binary system PSR B1259-63/LS 2883 around the 2010/2011 periastron passage
- Article/chapterEnglish2013
Publisher, publication year, extent ...
- 2013-03-01
- EDP Sciences,2013
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:lnu-30210
- https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30210URI
- https://doi.org/10.1051/0004-6361/201220612DOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-89790URI
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- Language:English
- Summary in:English
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- AuthorCount:205;
- Aims. We present very high energy (VHE; E > 100 GeV) data from the gamma-ray binary system PSR B1259-63/LS 2883 taken around its periastron passage on 15th of December 2010 with the High Energy Stereoscopic System (H. E. S. S.) of Cherenkov Telescopes. We aim to search for a possible TeV counterpart of the GeV flare detected by the Fermi LAT. In addition, we aim to study the current periastron passage in the context of previous observations taken at similar orbital phases, testing the repetitive behaviour of the source. Methods. Observations at VHEs were conducted with H.E.S.S. from 9th to 16th of January 2011. The total dataset amounts to similar to 6 h of observing time. The data taken around the 2004 periastron passage were also re-analysed with the current analysis techniques in order to extend the energy spectrum above 3 TeV to fully compare observation results from 2004 and 2011. Results. The source is detected in the 2011 data at a significance level of 11.5 sigma revealing an averaged integral flux above 1 TeV of (1.01 +/- 0.18(stat) +/- 0.20(sys)) x 10(-12) cm(-2) s(-1). The differential energy spectrum follows a power-law shape with a spectral index Gamma = 2.92 +/- 0.30(stat) +/- 0.20(sys) and a flux normalisation at 1 TeV of N-0 = (1.95 +/- 0.32(stat) +/- 0.39(sys)) x 10(-12) TeV-1 cm(-2) s(-1). The measured light curve does not show any evidence for variability of the source on the daily scale. The re-analysis of the 2004 data yields results compatible with the published ones. The differential energy spectrum measured up to similar to 10 TeV is consistent with a power law with a spectral index Gamma = 2.81 +/- 0.10(stat) +/- 0.20(sys) and a flux normalisation at 1 TeV of N-0 = (1.29 +/- 0.08(stat) +/- 0.26(sys)) x 10(-12) TeV-1 cm(-2) s(-1). Conclusions. The measured integral flux and the spectral shape of the 2011 data are compatible with the results obtained around previous periastron passages. The absence of variability in the H.E.S.S. data indicates that the GeV flare observed by Fermi LAT in the time period covered also by H.E.S.S. observations originates in a different physical scenario than the TeV emission. Moreover, the comparison of the new results to the results from the 2004 observations made at a similar orbital phase provides a stronger evidence of the repetitive behaviour of the source.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- gamma rays: general
- pulsars: individual: PSR B1259-63
- X-rays: binaries
- stars: individual: LS 2883
- Astropartikelfysik
- Astroparticle Physics
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- Acero, F. (author)
- Aharonian, F. (author)
- Akhperjanian, A. G. (author)
- Anton, G. (author)
- Balenderan, S. (author)
- Balzer, A. (author)
- Barnacka, A. (author)
- Becherini, Yvonne (author)
- Tjus, J. Becker (author)
- Bernloehr, K. (author)
- Birsin, E. (author)
- Biteau, J. (author)
- Boisson, C. (author)
- Bolmont, J. (author)
- Bordas, P. (author)
- Brucker, J. (author)
- Brun, F. (author)
- Brun, P. (author)
- Bulik, T. (author)
- Carrigan, S. (author)
- Casanova, S. (author)
- Cerruti, M. (author)
- Punch, MichaelUniv Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France(Swepub:lnu)mipuaa (author)
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- Conrad, JanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)conrad (author)
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- Daniel, M. K. (author)
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- Deil, C. (author)
- deWilt, P. (author)
- Dickinson, Hugh J.Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)hdick (author)
- Djannati-Atai, A. (author)
- Domainko, W. (author)
- Drury, L. O 'C. (author)
- Dubus, G. (author)
- Dutson, K. (author)
- Dyks, J. (author)
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- Egberts, K. (author)
- Eger, P. (author)
- Espigat, P. (author)
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- Farnier, ChristianStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)cfarn (author)
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- Fiasson, A. (author)
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- Komin, Nu (author)
- Kosack, K. (author)
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- de Naurois, M. (author)
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- Punch, MichaelUniv Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France(Swepub:lnu)mipuaa (author)
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- Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, FranceFysikum (creator_code:org_t)
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