Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920902b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #209.02
Other
Scientific paper
The international WEBT (The Whole Earth Blazar Telescope) consortium planned and carried out three days of intensive micro-variability observations of 0716+71 from February 22, 2009 to February 25, 2009. This object was chosen due to its bright apparent magnitude range ( 12-14 magnitudes in R), its high declination, and its very large duty cycle for micro-variations (Webb et al.2008). Thirty-six observatories in sixteen countries around the world participated in this continuous monitoring program and submitted data for compilation into a continuous light curve and subsequent analysis. We report here on the long continuous optical micro-variability light curve of 0716+71 obtained during the multi-site observing campaign during which the Blazar showed almost constant variability over a 0.5 magnitude range. The resulting reduced light curve is presented here for the first time. Individual observations from observatories were corrected for instrumental differences and the overall smoothed light curve was constructed from the highest quality data. The resulting nearly continuous light curve was analyzed using several techniques including Fourier transforms and noise analysis techniques. Since we found no repeatable periods consistent with other reports, and the noise analysis did not indicate that the light curve was due to simple stochastic noise, we have interpreted the variations in the light curve in terms of individual stochastic pulses due to cells in a turbulent jet which are energized by a passing shock and cool by means of synchrotron emission. Our work estimates some of the parameters of the Blazar jet like magnetic field, maximum energy of the electron, size of inhomogeneous regions etc. Such estimations help to understand the underlying physical processes in the jet and ultimately in the Blazar itself.
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