The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies

Aleksic J, Antonelli LA, Antoranz P, Asensio M, Backes M, De Almeida UB, Barrio JA, Bednarek W, Berger K, Bernardini E, Biland A, Blanch O, Bock RK, Boller A, Bonnefoy S, Bonnoli G, Tridon DB, Bretz T, Carmona E, Carosi A, Fidalgo DC, Colin P, Colombo E, Contreras JL, Cortina J, Cossio L, Covino S, Da Vela P, Dazzi F, De Angelis A, De Caneva G, De Lotto B, Mendez CD, Doert M, Dominguez A, Prester DD, Dorner D, Doro M, Eisenacher D, Elsaesser D, Ferenc D, Fonseca MV, Font L, Fruck C, Lopez RJG, Garczarczyk M, Terrats DG, Gaug M, Giavitto G, Godinovic N, Munoz AG, Gozzini SR, Hadamek A, Hadasch D, Herrero A, Hose J, Hrupec D, Jankowski F, Kadenius V, Klepser S, Knoetig ML, Kraehenbuehl T, Krause J, Kushida J, La Barbera A, Lelas D, Leonardo E, Lewandowska N, Lindfors E, Lombardi S, Lopez M, Lopez-Coto R, Lopez-Oramas A, Lorenz E, Lozano I, Makariev M, Mallot K, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Marcote B, Mariotti M, Martinez M, Masbou J, Mazin D, Meucci M, Miranda JM, Mirzoyan R, Moldon J, Moralejo A, Munar-Adrover P, Nakajima D, Niedzwiecki A, Nieto D, Nilsson K, Nowak N, Orito R, Paiano S, Palatiello M, Paneque D, Paoletti R, Paredes JM, Partini S, Persic M, Pilia M, Prada F, Pradamoroni PG, Prandini E, Puljak I, Reichardt I, Reinthal R, Rhode W, Ribo M, Rico J, Ruegamer S, Saggion A, Saito K, Saito TY, Salvati M, Satalecka K, Scalzotto V, Scapin V, Schultz C, Schweizer T, Shore SN, Sillanpaa A, Sitarek J, Snidaric I, Sobczynska D, Spanier F, Spiro S, Stamatescu V, Stamerra A, Steinke B, Storz J, Sun S, Suric T, Takalo L, Takami H, Tavecchio F, Temnikov P, Terzic T, Tescaro D, Teshima M, Tibolla O, Torres DF, Toyama T, Treves A, Uellenbeck M, Vogler P, Wagner RM, Weitzel Q, Zandanel F, Zanin R, Longo F, Lucarelli F, Pittori C, Vercellone S, Bastieri D, Sbarra C, Angelakis E, Fuhrmann L, Nestoras I, Krichbaum TP, Sievers A, Zensus JA, Antonyuk KA, Baumgartner W, Berduygin A, Carini M, Cook K, Gehrels N, Kadler M, Kovalev YA, Kovalev YY, Krauß F, Krimm HA, Lahteenmaki A, Lister ML, Max-Moerbeck W, Pasanen M, Pushkarev AB, Readhead ACS, Richards JL, Sainio J, Shakhovskoy DN, Sokolovsky KV, Tornikoski M, Tueller J, Weidinger M, Wilms J (2013)

Publication Status: Published

Publication Type: Journal article

Publication year: 2013

Journal

Publisher: EDP SCIENCES S A

Book Volume: 556

Article Number: UNSP A67

DOI: 10.1051/0004-6361/201220714

Abstract

Context. BL Lacertae objects are variable at all energy bands on time scales down to minutes. To construct and interpret their spectral energy distribution (SED), simultaneous broad-band observations are mandatory. Up to now, the number of objects studied during such campaigns is very limited and biased towards high flux states.Aims. We present the results of a dedicated multi-wavelength study of the high-frequency peaked BL Lacertae (HBL) object and known TeV emitter 1ES 2344+514 by means of a pre-organised campaign.Methods. The observations were conducted during simultaneous visibility windows of MAGIC and AGILE in late 2008. The measurements were complemented by Mets hovi, RATAN-600, KVA+Tuorla, Swift and VLBA pointings. Additional coverage was provided by the ongoing long-term F-GAMMA and MOJAVE programs, the OVRO 40-m and CrAO telescopes as well as the Fermi satellite. The obtained SEDs are modelled using a one-zone as well as a self-consistent two-zone synchrotron self-Compton model.Results. 1ES 2344+514 was found at very low flux states in both X-rays and very high energy gamma rays. Variability was detected in the low frequency radio and X-ray bands only, where for the latter a small flare was observed. The X-ray flare was possibly caused by shock acceleration characterised by similar cooling and acceleration time scales. MOJAVE VLBA monitoring reveals a static jet whose components are stable over time scales of eleven years, contrary to previous findings. There appears to be no significant correlation between the 15 GHz and R-band monitoring light curves. The observations presented here constitute the first multi-wavelength campaign on 1ES 2344+514 from radio to VHE energies and one of the few simultaneous SEDs during low activity states. The quasi-simultaneous Fermi-LAT data poses some challenges for SED modelling, but in general the SEDs are described well by both applied models. The resulting parameters are typical for TeV emitting HBLs. Consequently it remains unclear whether a so-called quiescent state was found in this campaign.

Authors with CRIS profile

Involved external institutions

California Institute of Technology (Caltech) United States (USA) (US) Purdue-University United States (USA) (US) Aalto University Espoo Finland (FI) National Aeronautics and Space Administration (NASA) United States (USA) (US) Max-Planck-Institut für Radioastronomie / Max Planck Institute for Radio Astronomy Germany (DE) Ruhr-Universität Bochum (RUB) Germany (DE) University of Turku / Turun yliopisto Finland (FI) Julius-Maximilians-Universität Würzburg Germany (DE) Western Kentucky University United States (USA) (US) Crimean Astrophysical Observatory (CrAO) Ukraine (UA) Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS) / Физи́ческий институ́т имени П.Н.Ле́бедева Российской академии наук (ФИАН) Russian Federation (RU) Technische Universität Dortmund Germany (DE) University of Insubria / Università degli Studi dell'Insubria Italy (IT) Institut d'Estudis Espacials de Catalunya (IEEC) Spain (ES) Max-Planck-Institut für Physik (Werner-Heisenberg-Institut, MPP) / Max Planck Institute for Physics Germany (DE) Instituto de Astrofísica de Canarias (IAC) Spain (ES) Sveučilište u Rijeci / University of Rijeka Croatia (HR) Universidad Complutense de Madrid (UCM) Spain (ES) University of Padua / Universita degli Studi di Padova Italy (IT) University of Udine / Università degli Studi di Udine Italy (IT) Universitat de Barcelona (UB) / University of Barcelona Spain (ES) Università degli Studi di Siena (UNISI) / University of Siena Italy (IT) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) Bulgarian Academy of Sciences (BAS) / Българска академия на науките Bulgaria (BG) Deutsches Elektronen-Synchrotron DESY Germany (DE) Institut de Fisica d'Altes Energies (IFAE) / The Institute for High Energy Physics Spain (ES) Autonomous University of Barcelona (UAB) / Universitat Autònoma de Barcelona Spain (ES) Università degli Studi di Trieste Italy (IT) Institute of Astrophysics of Andalusia / Instituto de Astrofísica de Andalucía (IAA-CSIC) Spain (ES) Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich Switzerland (CH) Kyoto University / 京都大学 Kyōto daigaku Japan (JP) IRAM : Institut de Radioastronomie Millimétrique France (FR) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) Italian Space Agency / Agenzia Spaziale Italiana (ASI) Italy (IT) University of Lodz / Uniwersytet Łódzki Poland (PL) University of Pisa / Università di Pisa (UniPi) Italy (IT) Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) Spain (ES)

How to cite

APA:

Aleksic, J., Antonelli, L.A., Antoranz, P., Asensio, M., Backes, M., De Almeida, U.B.,... Wilms, J. (2013). The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies. Astronomy & Astrophysics, 556. https://dx.doi.org/10.1051/0004-6361/201220714

MLA:

Aleksic, J., et al. "The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies." Astronomy & Astrophysics 556 (2013).

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