Localizing the VHE γ-ray source at the galactic centre

Acero F, 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, Braun IV, Brucker J, Brun F, Brun P, Buehler R, Bulik T, Buesching I, Boutelier T, Chadwick PM, Charbonnier A, Chaves RCG, Cheesebrough A, Conrad J, 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, Eger P, Espigat P, Fallon L, Farnier C, Fegan S, 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 M, Heinz S, Heinzelmann G, Henri G, Hermann G, Hinton JA, Hoffmann A, Hofmann W, Hofverberg P, 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 TM, 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, Mehault J, 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, Reimer O, Renaud M, Rieger F, Ripken J, Rob L, Rosier-Lees S, Rowell G, Rudak B, Rulten CB, Ruppel J, Ryde F, Sahakian V, Santangelo A, Schlickeiser R, Schoeck FM, Schoenwald A, Schwanke U, Schwarzburg S, Schwemmer S, Shalchi A, Sikora M, Skilton JL, Sol H, Stawarz L, Steenkamp R, Stegmann C, Stinzing F, Superina G, Sushch I, 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 (2010)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2010

Journal

Publisher: Oxford University Press (OUP): Policy P - Oxford Open Option A

Book Volume: 402

Pages Range: 1877-1882

Journal Issue: 3

DOI: 10.1111/j.1365-2966.2009.16014.x

Abstract

The inner 10 pc of our Galaxy contains many counterpart candidates of the very high energy (VHE; >100 GeV) γ-ray point source HESS J1745-290. Within the point spread function of the H.E.S.S. measurement, at least three objects are capable of accelerating particles to VHE and beyond and of providing the observed γ-ray flux. Previous attempts to address this source confusion were hampered by the fact that the projected distances between these objects were of the order of the error circle radius of the emission centroid (34 arcsec, dominated by the pointing uncertainty of the H.E.S.S. instrument). Here we present H.E.S.S. data of the Galactic Centre region, recorded with an improved control of the instrument pointing compared to H.E.S.S. standard pointing procedures. Stars observed during γ-ray observations by optical guiding cameras mounted on each H.E.S.S. telescope are used for off-line pointing calibration, thereby decreasing the systematic pointing uncertainties from 20 to 6 arcsec per axis. The position of HESS J1745-290 is obtained by fitting a multi-Gaussian profile to the background-subtracted γ-ray count map. A spatial comparison of the best-fitting position of HESS J1745-290 with the position and morphology of candidate counterparts is performed. The position is, within a total error circle radius of 13 arcsec, coincident with the position of the supermassive black hole Sgr A* and the recently discovered pulsar wind nebula candidate G359.95-0.04. It is significantly displaced from the centroid of the supernova remnant Sgr A East, excluding this object with high probability as the dominant source of the VHE γ-ray emission. © 2009 The Authors. Journal compilation © 2009 RAS.

Authors with CRIS profile

Involved external institutions

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

How to cite

APA:

Acero, F., Aharonian, F., Akhperjanian, A.G., Anton, G., De Almeida, U.B., Bazer-Bachi, A.R.,... Zech, A. (2010). Localizing the VHE γ-ray source at the galactic centre. Monthly Notices of the Royal Astronomical Society, 402(3), 1877-1882. https://doi.org/10.1111/j.1365-2966.2009.16014.x

MLA:

Acero, F., et al. "Localizing the VHE γ-ray source at the galactic centre." Monthly Notices of the Royal Astronomical Society 402.3 (2010): 1877-1882.

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