H.E.S.S. Observations of the Binary System PSR B1259-63/LS 2883 around the 2010/2011 Periastron Passage
Abstract
Aim. In this paper 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 (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 behavior of the source. Methods. Observations at VHE were conducted with H.E.S.S. from 9th to 16th of January 2011. The total dataset amounts to around 6 h of observing time. 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 \pm 0.18_{stat} \pm 0.20_{sys}) \times 10^{-12} cm^{-2}s^{-1}. The differential energy spectrum follows a power-law shape with a spectral index \Gamma = 2.92 \pm 0.30_{stat} \pm 0.20_{sys} and a flux normalisation at 1 TeV of N_{0} = 1.95 \pm 0.32_{stat} \pm 0.39_{sys}) \times 10^{-12} TeV^{-1} cm^{-2} s^{-1}. The measured lightcurve does not show any evidence for variability of the source on the daily scale. 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. Additionaly, new results compared to those obtained in the observations which were performed in 2004 at a similar orbital phase, further support the hypothesis of the repetitive behavior of the source.
Keywords
Cite
@article{arxiv.1301.3930,
title = {H.E.S.S. Observations of the Binary System PSR B1259-63/LS 2883 around the 2010/2011 Periastron Passage},
author = {H. E. S. S. Collaboration and : and A. Abramowski and F. Acero and F. Aharonian and A. G. Akhperjanian and G. Anton and S. Balenderan and A. Balzer and A. Barnacka and Y. Becherini and J. Becker Tjus and K. Bernlöhr and E. Birsin and J. Biteau and A. Bochow and C. Boisson and J. Bolmont and P. Bordas and J. Brucker and F. Brun and P. Brun and T. Bulik and S. Carrigan and S. Casanova and M. Cerruti and P. M. Chadwick and R. C. G. Chaves and A. Cheesebrough and S. Colafrancesco and G. Cologna and J. Conrad and C. Couturier and M. Dalton and M. K. Daniel and I. D. Davids and B. Degrange and C. Deil and P. deWilt and H. J. Dickinson and A. Djannati-Ataï and W. Domainko and L. O'C. Drury and G. Dubus and K. Dutson and J. Dyks and M. Dyrda and K. Egberts and P. Eger and P. Espigat and L. Fallon and C. Farnier and S. Fegan and F. Feinstein and M. V. Fernandes and D. Fernandez and A. Fiasson and G. Fontaine and A. Förster and M. Füßling and M. Gajdus and Y. A. Gallant and T. Garrigoux and H. Gast and B. Giebels and J. F. Glicenstein and B. Glück and D. Göring and M. -H. Grondin and M. Grudzińska and S. Häffner and J. D. Hague and J. Hahn and D. Hampf and J. Harris and S. Heinz and G. Heinzelmann and G. Henri and G. Hermann and A. Hillert and J. A. Hinton and W. Hofmann and P. Hofverberg and M. Holler and D. Horns and A. Jacholkowska and C. Jahn and M. Jamrozy and I. Jung and M. A. Kastendieck and K. Katarzyński and U. Katz and S. Kaufmann and B. Khélifi and S. Klepser and D. Klochkov and W. Kluźniak and T. Kneiske and D. Kolitzus and Nu. Komin and K. Kosack and R. Kossakowski and F. Krayzel and P. P. Krüger and H. Laffon and G. Lamanna and J. Lefaucheur and M. Lemoine-Goumard and J. -P. Lenain and D. Lennarz and T. Lohse and A. Lopatin and C. -C. Lu and V. Marandon and A. Marcowith and J. Masbou and G. Maurin and N. Maxted and M. Mayer and T. J. L. McComb and M. C. Medina and J. Méhault and U. Menzler and R. Moderski and M. Mohamed and E. Moulin and C. L. Naumann and M. Naumann-Godo and M. de Naurois and D. Nedbal and N. Nguyen and J. Niemiec and S. J. Nolan and S. Ohm and E. de Oña Wilhelmi and B. Opitz and M. Ostrowski and I. Oya and M. Panter and R. D. Parsons and M. Paz Arribas and N. W. Pekeur and G. Pelletier and J. Perez and P. -O. Petrucci and B. Peyaud and S. Pita and G. Pühlhofer and M. Punch and A. Quirrenbach and S. Raab and M. Raue and A. Reimer and O. Reimer and M. Renaud and R. de los Reyes and F. Rieger and J. Ripken and L. Rob and S. Rosier-Lees and G. Rowell and B. Rudak and C. B. Rulten and V. Sahakian and D. A. Sanchez and A. Santangelo and R. Schlickeiser and A. Schulz and U. Schwanke and S. Schwarzburg and S. Schwemmer and F. Sheidaei and J. L. Skilton and H. Sol and G. Spengler and Ł. Stawarz and R. Steenkamp and C. Stegmann and F. Stinzing and K. Stycz and I. Sushch and A. Szostek and J. -P. Tavernet and R. Terrier and M. Tluczykont and C. Trichard and K. Valerius and C. van Eldik and G. Vasileiadis and C. Venter and A. Viana and P. Vincent and H. J. Völk and F. Volpe and S. Vorobiov and M. Vorster and S. J. Wagner and M. Ward and R. White and A. Wierzcholska and D. Wouters and M. Zacharias and A. Zajczyk and A. A. Zdziarski and A. Zech and H. -S. Zechlin},
journal= {arXiv preprint arXiv:1301.3930},
year = {2015}
}
Comments
8 pages, 5 figures, 1 table, accepted for publication in A&A