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Multiwavelength intraday variability of the BL Lacertae S5 0716+714

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dc.contributor.author Gupta, A. C
dc.contributor.author Krichbaum, T. P
dc.contributor.author Wiita, P. J
dc.contributor.author Rani, B
dc.contributor.author Sokolovsky, K. V
dc.contributor.author Mohan, Prashanth
dc.contributor.author Mangalam, A
dc.contributor.author Marchili, N
dc.contributor.author Fuhrmann, L
dc.contributor.author Agudo, I
dc.contributor.author Bach, U
dc.contributor.author Bachev, R
dc.contributor.author Böttcher, M
dc.contributor.author Gabanyi, K. E
dc.contributor.author Gaur, H
dc.contributor.author Hawkins, K
dc.contributor.author Kimeridze, G. N
dc.contributor.author Kurtanidze, O. M
dc.contributor.author Kurtanidze, S. O
dc.contributor.author Lee, C.-U
dc.contributor.author Liu, X
dc.contributor.author McBreen, B
dc.contributor.author Nesci, R
dc.contributor.author Nestoras, G
dc.contributor.author Nikolashvili, M. G
dc.contributor.author Ohlert, J. M
dc.contributor.author Palma, N
dc.contributor.author Peneva, S
dc.contributor.author Pursimo, T
dc.contributor.author Semkov, E
dc.contributor.author Strigachev, A
dc.contributor.author Webb, J. R
dc.contributor.author Wiesemeyer, H
dc.contributor.author Zensus, J. A
dc.date.accessioned 2012-08-17T09:52:06Z
dc.date.available 2012-08-17T09:52:06Z
dc.date.issued 2012-09
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 425, No. 2, pp. 1357–1370 en
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/2248/5846
dc.description Restricted access en
dc.description.abstract We report results from a one-week multiwavelength campaign to monitor the BL Lacertae object (BL Lac) S5 0716+714 (on 2009 December 9–16). Nine ground-based telescopes at widely separated longitudes and one space-based telescope aboard the Swift satellite collected optical data. Radio data were obtained from the Effelsberg and Urumqi observatories and X-ray data from Swift. In the radio bands, the source shows rapid [∼(0.5–1.5) d] intraday variability with peak amplitudes of up to ∼10 per cent. The variability at 2.8 cm leads by about 1 d the variability at 6 and 11 cm. This time lag and more rapid variations suggest an intrinsic contribution to the source's intraday variability at 2.8 cm, while at 6 and 11 cm, interstellar scintillation (ISS) seems to predominate. Large and quasi-sinusoidal variations of ∼0.8 mag were detected in the V, R and I bands. The X-ray data (0.2–10 keV) do not reveal significant variability on a 4 d time-scale, favouring reprocessed inverse Compton over synchrotron radiation in this band. The characteristic variability time-scales in radio and optical bands are similar. A quasi-periodic variation of 0.9–1.1 d in the optical data may be present, but if so it is marginal and limited to 2.2 cycles. Cross-correlations between radio and optical bands are discussed. The lack of a strong radio–optical correlation indicates different physical causes of variability (ISS at long radio wavelengths, source intrinsic origin in the optical) and is consistent with a high jet opacity and a compact synchrotron component peaking at ≃100 GHz in an ongoing very prominent flux-density outburst. For the campaign period, we construct a quasi-simultaneous spectral energy distribution, including γ-ray data from the Fermi satellite. We obtain lower limits for the relativistic Doppler boosting of δ ≥ 12–26, which for a BL Lac-type object is remarkably high. en
dc.language.iso en en
dc.publisher Wiley-Blackwell en
dc.relation.uri http://dx.doi.org/10.1111/j.1365-2966.2012.21550.x en
dc.subject Galaxies: active en
dc.subject BL Lacertae objects: general en
dc.subject BL Lacertae objects: individual: S5 0716+714 en
dc.title Multiwavelength intraday variability of the BL Lacertae S5 0716+714 en
dc.type Article en

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