Very high energy γ-ray observations of the binary PSR B1259-63/SS2883 around the 2007 Periastron

被引：69

作者：

Aharonian, F. ^{[1
,14
]}

Akhperjanian, A. G. ^{[2
]}

Anton, G. ^{[17
]}

de Almeida, U. Barres ^{[8
]}

Bazer-Bachi, A. R. ^{[3
]}

Becherini, Y. ^{[14
]}

Behera, B. ^{[15
]}

Bernloehr, K. ^{[1
,5
]}

Bochow, A. ^{[1
]}

Boisson, C. ^{[6
]}

Bolmont, J. ^{[20
]}

Borrel, V. ^{[3
]}

Brucker, J. ^{[17
]}

Brun, F. ^{[20
]}

Brun, P. ^{[7
]}

Buehler, R. ^{[1
]}

Bulik, T. ^{[25
]}

Buesching, I. ^{[9
]}

Boutelier, T. ^{[18
]}

Chadwick, P. M. ^{[8
]}

Charbonnier, A. ^{[20
]}

Chaves, R. C. G. ^{[1
]}

Cheesebrough, A. ^{[8
]}

Chounet, L. -M. ^{[10
]}

Clapson, A. C. ^{[1
]}

Coignet, G. ^{[11
]}

Dalton, M. ^{[5
]}

Daniel, M. K. ^{[8
]}

Davids, I. D. ^{[9
,23
]}

Degrange, B. ^{[10
]}

Deil, C. ^{[1
]}

Dickinson, H. J. ^{[8
]}

Djannati-Atai, A. ^{[12
,13
]}

Domainko, W. ^{[1
]}

Drury, L. O'C. ^{[14
]}

Dubois, F. ^{[11
]}

Dubus, G. ^{[18
]}

Dyks, J. ^{[25
]}

Dyrda, M. ^{[29
]}

Egberts, K. ^{[1
]}

Emmanoulopoulos, D. ^{[15
]}

Espigat, P. ^{[12
,13
]}

Farnier, C. ^{[16
]}

Feinstein, F. ^{[16
]}

Fiasson, A. ^{[11
]}

Foerster, A. ^{[1
]}

Fontaine, G. ^{[10
]}

Fuessling, M. ^{[5
]}

Gabici, S. ^{[14
]}

Gallant, Y. A. ^{[16
]}

机构：

[1] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

[2] Yerevan Phys Inst, Yerevan 375036, Armenia

[3] UPS, CNRS, Ctr Etud Spatiale Rayonnements, F-31029 Toulouse 4, France

[4] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

[5] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[6] Univ Paris Diderot, CNRS, Observ Paris, LUTH, F-92190 Meudon, France

[7] CE Saclay, CEA, DSM, IRFU, F-91191 Gif Sur Yvette, France

[8] Univ Durham, Dept Phys, Durham DH1 3LE, England

[9] North West Univ, Unit Space Phys, ZA-2520 Potchefstroom, South Africa

[10] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[11] Univ Savoie, CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France

[12] Univ Paris 07, CNRS, F-75205 Paris 13, France

[13] Univ Paris 07, CNRS, UMR 7164, CEA,Observ Paris, F-75221 Paris 05, France

[14] Dublin Inst Adv Studies, Dublin 2, Ireland

[15] Univ Heidelberg, D-69117 Heidelberg, Germany

[16] Univ Montpellier 2, CNRS, IN2P3, Lab Phys Theor & Astroparticules, F-34095 Montpellier 5, France

[17] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[18] Univ Grenoble 1, CNRS, INSU, Lab Astrophys Grenoble, F-38041 Grenoble 9, France

[19] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany

[20] Univ Paris 07, Univ Paris 06, LPNHE, CNRS,IN2P3, F-75252 Paris 5, France

[21] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, Prague 18000, Czech Republic

[22] Ruhr Univ Bochum, Inst Theoret Phys, Lehrstuhl Weltraum & Astrophys 4, D-44780 Bochum, Germany

[23] Univ Namibia, Windhoek, Namibia

[24] Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, PL-30244 Krakow, Poland

[25] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[26] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[27] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia

[28] Nicholas Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland

[29] Inst Fizyki Jadrowej PAN, PL-31342 Krakow, Poland

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 507卷 / 01期

基金：

英国科学技术设施理事会; 新加坡国家研究基金会;

关键词：

radiation mechanisms: non-thermal; methods: observational; stars: binaries: general; stars: neutron; gamma rays: observations; telescopes; RADIO OBSERVATIONS; SYSTEM; EMISSION; PULSAR; STAR; HESS; TELESCOPE; DISCOVERY; RADIATION; PASSAGE;

D O I：

10.1051/0004-6361/200912339

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. This article presents very-high-energy (VHE; E > 100 GeV) data from the gamma-ray binary PSR B1259-63 as taken during the years 2005, 2006 and before as well as shortly after the 2007 periastron passage. These data extend the knowledge of the lightcurve of this object to all phases of the 3.4 year binary orbit. The lightcurve constrains physical mechanisms present in this TeV source. Methods. Observations of VHE gamma-rays with the HESS telescope array using the Imaging Atmospheric Cherenkov Technique were performed. The HESS instrument features an angular resolution of < 0.1 degrees and an energy resolution of < 20%. Gamma-ray events in an energy range of 0.5-70 TeV were recorded. From these data, energy spectra and lightcurve with a monthly time sampling were extracted. Results. VHE gamma-ray emission from PSR B1259-63 was detected with an overall significance of 9.5 standard deviations using 55 h of exposure, obtained from April to August 2007. The monthly flux of gamma-rays during the observation period was measured, yielding VHE lightcurve data for the early pre-periastron phase of the system for the first time. No spectral variability was found on timescales of months. The spectrum is described by a power law with a photon index of Gamma = 2.8 +/- 0.2(stat) +/- 0.2(sys) and flux normalisation Phi(0) = (1.1 +/- 0.1(stat) +/- 0.2(sys)) x 10(-12) TeV-1 cm(-2) s(-1). PSR B1259-63 was also monitored in 2005 and 2006, far from periastron passage, comprising 8.9 h and 7.5 h of exposure, respectively. No significant excess of.-rays is seen in those observations. Conclusions. PSR B1259-63 has been re-confirmed as a variable TeV gamma-ray emitter. The firm detection of VHE photons emitted at a true anomaly theta approximate to -0.35 of the pulsar orbit, i.e. already similar to 50 days prior to the periastron passage, disfavors the stellar disc target scenario as a primary emission mechanism, based on current knowledge about the companion star's disc inclination, extension, and density profile.

引用

页码：389 / 396

页数：8

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