dc.contributor.author |
Gupta, A. C |
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dc.contributor.author |
Krichbaum, T. P |
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dc.contributor.author |
Wiita, P. J |
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dc.contributor.author |
Rani, B |
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dc.contributor.author |
Sokolovsky, K. V |
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dc.contributor.author |
Mohan, Prashanth |
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dc.contributor.author |
Mangalam, A |
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dc.contributor.author |
Marchili, N |
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dc.contributor.author |
Fuhrmann, L |
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dc.contributor.author |
Agudo, I |
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dc.contributor.author |
Bach, U |
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dc.contributor.author |
Bachev, R |
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dc.contributor.author |
Böttcher, M |
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dc.contributor.author |
Gabanyi, K. E |
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dc.contributor.author |
Gaur, H |
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dc.contributor.author |
Hawkins, K |
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dc.contributor.author |
Kimeridze, G. N |
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dc.contributor.author |
Kurtanidze, O. M |
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dc.contributor.author |
Kurtanidze, S. O |
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dc.contributor.author |
Lee, C.-U |
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dc.contributor.author |
Liu, X |
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dc.contributor.author |
McBreen, B |
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dc.contributor.author |
Nesci, R |
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dc.contributor.author |
Nestoras, G |
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dc.contributor.author |
Nikolashvili, M. G |
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dc.contributor.author |
Ohlert, J. M |
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dc.contributor.author |
Palma, N |
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dc.contributor.author |
Peneva, S |
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dc.contributor.author |
Pursimo, T |
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dc.contributor.author |
Semkov, E |
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dc.contributor.author |
Strigachev, A |
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dc.contributor.author |
Webb, J. R |
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dc.contributor.author |
Wiesemeyer, H |
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dc.contributor.author |
Zensus, J. A |
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dc.date.accessioned |
2012-08-17T09:52:06Z |
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dc.date.available |
2012-08-17T09:52:06Z |
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dc.date.issued |
2012-09 |
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dc.identifier.citation |
Monthly Notices of the Royal Astronomical Society, Vol. 425, No. 2, pp. 1357–1370 |
en |
dc.identifier.issn |
0035-8711 |
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dc.identifier.uri |
http://hdl.handle.net/2248/5846 |
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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 |