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

van Eldik C, Aharonian F, Akhperjanian AG, Anton G, De Almeida UB, Bazer-Bachi AR, Becherini Y, Behera B, Bernloehr K, Bochow A, Boisson C, Bolmont J, Borrel V, Brucker J, Brun F, Brun P, Buehler R, Bulik T, Buesching I, Boutelier T, Chadwick PM, Charbonnier A, Chaves RCG, Cheesebrough A, Chounet LM, Clapson AC, Coignet G, Dalton M, Daniel MK, Davids ID, Degrange B, Deil C, Dickinson HJ, Djannati-Atai A, Domainko W, Drury LO, Dubois F, Dubus G, Dyks J, Dyrda M, Egberts K, Emmanoulopoulos D, Espigat P, Farnier C, Feinstein F, Fiasson A, Foerster A, Fontaine G, Fuessling M, Gabici S, Gallant YA, Gerard L, Gerbig D, Giebels B, Glicenstein JF, Glueck B, Goret P, Göring D, Hauser D, Hauser M, Heinz S, Heinzelmann G, Henri G, Hermann G, Hinton JA, Hoffmann A, Hofmann W, Holleran M, Hoppe S, Horns D, Jacholkowska A, De Jager OC, Jahn C, Jung I, Katarzynski K, Katz U, Kaufmann S, Kerschhaggl M, Khangulyan D, Khelifi B, Keogh D, Klochkov D, Kluzniak W, Kneiske T, Komin N, Kosack K, Kossakowski R, Lamanna G, Lenain JP, Lohse T, Marandon V, Martineau-Huynh O, Marcowith A, Masbou J, Maurin D, Mccomb TJL, Medina MC, Moderski R, Moulin E, Naumann-Godo M, De Naurois M, Nedbal D, Nekrassov D, Nicholas B, Niemiec J, Nolan SJ, Ohm S, Olive JF, Wilhelmi EDO, Orford KJ, Ostrowski M, Panter M, Arribas MP, Pedaletti G, Pelletier G, Petrucci PO, Pita S, Puehlhofer G, Punch M, Quirrenbach A, Raubenheimer BC, Raue M, Rayner SM, Renaud M, Rieger F, Ripken J, Rob L, Rosier-Lees S, Rowell G, Rudak B, Rulten CB, Ruppel J, Sahakian V, Santangelo A, Schlickeiser R, Schoeck FM, Schwanke U, Schwarzburg S, Schwemmer S, Shalchi A, Sikora M, Skilton JL, Sol H, Spangler D, Stawarz L, Steenkamp R, Stegmann C, Stinzing F, Superina G, Szostek A, Tam PH, Tavernet JP, Terrier R, Tibolla O, Tluczykont M, Van Eldik C, Vasileiadis G, Venter C, Venter L, Vialle JP, Vincent P, Vivier M, Voelk HJ, Volpe F, Wagner SJ, Ward M, Zdziarski AA, Zech A (2009)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2009

Journal

Book Volume: 507

Pages Range: 389-396

Journal Issue: 1

DOI: 10.1051/0004-6361/200912339

Abstract

Aims. This article presents very-high-energy (VHE; E > 100 GeV) data from the-ray binary PSRB1259-63 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-rays with the HESS telescope array using the Imaging Atmospheric Cherenkov Technique were performed. The HESS instrument features an angular resolution of <0.1° 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-ray emission from PSRB1259-63 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-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 G = 2.8 ± 0.2stat ± 0.2sys and flux normalisation F0 = (1.1 ± 0.1stat ± 0.2sys) × 10-12 TeV-1 cm-2 s-1. PSRB1259-63 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.PSRB1259-63 has been re-confirmed as a variable TeV-ray emitter. The firm detection of VHE photons emitted at a true anomaly ? ≈-0.35 of the pulsar orbit, i.e. already 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. © 2009 ESO.

Authors with CRIS profile

Involved external institutions

Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences Poland (PL) Noordwes-Universiteit / North-West University South Africa (ZA) Max-Planck-Institut für Kernphysik (MPIK) / Max Planck Institute for Nuclear Physics Germany (DE) Humboldt-Universität zu Berlin Germany (DE) École Polytechnique - Université Paris-Saclay France (FR) Durham University United Kingdom (GB) Université Toulouse III - Paul Sabatier France (FR) Université Joseph Fourier (UJF Grenoble 1) France (FR) Dublin Institute for Advanced Studies (DIAS) Ireland (IE) Ruprecht-Karls-Universität Heidelberg Germany (DE) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) Centre CEA de Saclay (Essonne) France (FR) University of Savoy Mont Blanc / Université Savoie Mont Blanc France (FR) Institute of Nuclear Physics PAN / Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego PAN Poland (PL) University of Montpellier / Université Montpellier France (FR) Universität Hamburg (UHH) Germany (DE) University of Leeds United Kingdom (GB) Eberhard Karls Universität Tübingen Germany (DE) Nicolaus Copernicus University (NCU) / Uniwersytet Mikołaja Kopernika w Toruniu (UMK) Poland (PL) Univerzita Karlova v Praze / Charles University in Prague Czech Republic (CZ) University of Adelaide Australia (AU) Jagiellonian University / Uniwersytet Jagielloński (UJ) Poland (PL) Ruhr-Universität Bochum (RUB) Germany (DE) Yerevan Physics Institute (YerPhI) / Երևանի Ֆիզիկայի Ինստիտուտ Armenia (AM) University of Namibia (UNAM) Namibia (NA)

How to cite

APA:

van Eldik, C., Aharonian, F., Akhperjanian, A.G., Anton, G., De Almeida, U.B., Bazer-Bachi, A.R.,... Zech, A. (2009). Very high energy γ-ray observations of the binary PSR B1259-63/SS2883 around the 2007 Periastron. Astronomy & Astrophysics, 507(1), 389-396. https://doi.org/10.1051/0004-6361/200912339

MLA:

van Eldik, Christopher, et al. "Very high energy γ-ray observations of the binary PSR B1259-63/SS2883 around the 2007 Periastron." Astronomy & Astrophysics 507.1 (2009): 389-396.

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