Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare

Aharonian F, Akhperjanian AG, De Almeida UB, Bazer-Bachi AR, Becherini Y, Behera B, Benbow W, Bernloehr K, Boisson C, Bochow A, Borrel V, Braun IV, Brion E, Brucker J, Brun P, Buehler R, Bulik T, Buesching I, Boutelier T, Carrigan S, Chadwick PM, Charbonnier A, Chaves RCG, Cheesebrough A, Chounet LM, Clapson AC, Coignet G, Dalton M, 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, Giebels B, Glicenstein JF, Glueck B, Goret P, Hadjichristidis C, 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, Jung I, Katarzynski K, Kaufmann S, Kendziorra E, Kerschhaggl M, Khangulyan D, Khelifi B, Keogh D, Komin N, Kosack K, Lamanna G, Lenain JP, Lohse T, Marandon V, Martin JM, Martineau-Huynh O, Marcowith A, Maurin D, Mccomb TJL, Medina MC, Moderski R, Moulin E, Naumann-Godo M, De Naurois M, Nedbal D, Nekrassov D, Niemiec J, Nolan SJ, Ohm S, Olive JF, Wilhelmi EDO, Orford KJ, Osborne JL, Ostrowski M, Panter M, 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, Schroeder R, Schwanke U, Schwarzburg S, Schwemmer S, Shalchi A, Skilton JL, Sol H, Spangler D, Stawarz L, Steenkamp R, Stegmann C, Superina G, Tam PH, Tavernet JP, Terrier R, Tibolla O, van Eldik C, Vasileiadis G, Venter C, Vialle JP, Vincent P, Vivier M, Voelk HJ, Volpe F, Wagner SJ, Ward M, Zdziarski AA, Zech A (2008)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2008

Journal

Publisher: EDP Sciences

Book Volume: 492

Pages Range: L25-L28

Journal Issue: 1

DOI: 10.1051/0004-6361:200810912

Abstract

The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV γ-ray source HESSJ1745-290 is coincident with Sgr A* and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint HESS/Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of ≈9 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV γ-ray flux from this region. We find that an increase in the γ-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the γ-ray emission is produced within ∼ cm (∼100 Rs) of the supermassive black hole. © 2008 ESO.

Authors with CRIS profile

Involved external institutions

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

How to cite

APA:

Aharonian, F., Akhperjanian, A.G., De Almeida, U.B., Bazer-Bachi, A.R., Becherini, Y., Behera, B.,... Zech, A. (2008). Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare. Astronomy & Astrophysics, 492(1), L25-L28. https://doi.org/10.1051/0004-6361:200810912

MLA:

Aharonian, F., et al. "Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare." Astronomy & Astrophysics 492.1 (2008): L25-L28.

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