Multi-wavelength observations of H 2356-309

van Eldik C, Abramowski A, Acero F, Aharonian F, Akhperjanian AG, Anton G, De Almeida UB, Bazer-Bachi AR, Becherini Y, Behera B, Benbow W, 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, Conrad J, Chounet LM, Clapson AC, Coignet G, Costamante L, 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, Fernandes MV, 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, Hampf 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, Lu CC, Marandon V, 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, Nguyen N, Nicholas B, Niemiec J, Nolan SJ, Ohm S, Olive JF, Wilhelmi EDO, Opitz B, 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, De Los Reyes R, 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, Sushch I, Sikora M, Skilton JL, Sol H, Stawarz L, Steenkamp R, Stegmann C, Stinzing F, Szostek A, Tam PH, Tavernet JP, Terrier R, Tibolla O, Tluczykont M, Valerius K, Van Eldik C, Vasileiadis G, Venter C, Venter L, Vialle JP, Viana A, Vincent P, Vivier M, Voelk HJ, Volpe F, Vorobiov S, Wagner SJ, Ward M, Zdziarski AA, Zech A, Zechlin HS (2010)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2010

Journal

Publisher: EDP Sciences

Book Volume: 516

Article Number: aa14321-10

Journal Issue: 6

DOI: 10.1051/0004-6361/201014321

Abstract

Aims. The properties of the broad-band emission from the high-frequency peaked BL Lac H 2356-309 (z = 0.165) are investigated. Methods. Very high energy (VHE; E > 100 GeV) observations of H 2356-309 were performed with the High Energy Stereoscopic System (HESS) from 2004 through 2007. Simultaneous optical/UV and X-ray observations were made with the XMM-Newton satellite on June 12/13 and June 14/15, 2005. NRT radio observations were also contemporaneously performed in 2005. ATOM optical monitoring observations were also made in 2007. Results. A strong VHE signal, ∼13σ total, was detected by HESS after the four years HESS observations (116.8 h live time). The integral flux above 240 GeV is I(>240 GeV) = (3.06 ± 0.26 ± 0.61) × 10 cm s, corresponding to ∼1.6% of the flux observed from the Crab Nebula. A time-averaged energy spectrum is measured from 200 GeV to 2 TeV and is characterized by a power law (photon index of Γ = 3.06 ± 0.15 ± 0.10). Significant small-amplitude variations in the VHE flux from H 2356-309 are seen on time scales of months and years, but not on shorter time scales. No evidence for any variations in the VHE spectral slope are found within these data. The XMM-Newton X-ray measurements show a historically low X-ray state, characterized by a hard, broken-power-law spectrum on both nights. Conclusions. The broad-band spectral energy distribution (SED) of the blazar can be adequately fit using a simple one-zone synchrotron self-Compton (SSC) model. In the SSC scenario, higher VHE fluxes could be expected in the future since the observed X-ray flux is at a historically low level. © 2010 ESO.

Authors with CRIS profile

Involved external institutions

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

How to cite

APA:

van Eldik, C., Abramowski, A., Acero, F., Aharonian, F., Akhperjanian, A.G., Anton, G.,... Zechlin, H.-S. (2010). Multi-wavelength observations of H 2356-309. Astronomy & Astrophysics, 516(6). https://dx.doi.org/10.1051/0004-6361/201014321

MLA:

van Eldik, Christopher, et al. "Multi-wavelength observations of H 2356-309." Astronomy & Astrophysics 516.6 (2010).

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