Bibcode
Aleksić, J.; Antonelli, L. A.; Antoranz, P.; Asensio, M.; Backes, M.; Barres de Almeida, U.; Barrio, J. A.; Bednarek, W.; Berger, K.; Bernardini, E.; Biland, A.; Blanch, O.; Bock, R. K.; Boller, A.; Bonnefoy, S.; Bonnoli, G.; Borla Tridon, D.; Bretz, T.; Carmona, E.; Carosi, A.; Carreto Fidalgo, D.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Cossio, L.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Lotto, B.; Delgado Mendez, C.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Eisenacher, D.; Elsaesser, D.; Ferenc, D.; Fonseca, M. V.; Font, L.; Fruck, C.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Giavitto, G.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hadamek, A.; Hadasch, D.; Herrero, A.; Hose, J.; Hrupec, D.; Jankowski, F.; Kadenius, V.; Klepser, S.; Knoetig, M. L.; Krähenbühl, T.; Krause, J.; Kushida, J.; La Barbera, A.; Lelas, D.; Leonardo, E.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; López, M.; López-Coto, R.; López-Oramas, A.; Lorenz, E.; Lozano, I.; Makariev, M.; Mallot, K.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, M.; Martínez, M.; Masbou, J.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Moldón, J.; Moralejo, A.; Munar-Adrover, P.; Nakajima, D.; Niedzwiecki, A.; Nieto, D.; Nilsson, K.; Nowak, N.; Orito, R.; Paiano, S.; Palatiello, M. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 556, id.A67, 28 pp.
Advertised on:
8
2013
Journal
Citations
27
Refereed citations
25
Description
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 Metsähovi,
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.
Appendix is only available in electronic form at http://www.aanda.org