The Multiple Timescales of Optical Variability of the Blazar 3C 279 During the 2001-2002 Outburst

Details The Multiple Timescales of Optical Variability of the Blazar 3C 279 During the 2001-2002 Outburst The Multiple Timescales of Optical Variability of the Blazar 3C 279 During the 2001-2002 Outburst

2007-02-28

arxiv.org/abs/astro-ph/0702736v1

Astron.J.133:2866-2882,2007

Astronomy and Astrophysics

Astrophysics

44 pages, 21 figures, 3 tables Accepted for publication in the Astronomical Journal

Scientific paper

10.1086/515574

During 2001-2002 the optically violent variable (OVV) blazar 3C 279 un- derwent the most intense outburst seen during the entire fourteen year history that this quasar has been studied at Colgate University's Foggy Bottom Obser- vatory (FBO). This study concentrates on ~1600 R-filter images taken during this period of activity. This data set includes twenty-nine nights of microvari- ability coverage. The outburst began in March 2001, after 3C 279 had faded to its faintest level, R = 15.5, in four years. The source reached its brightest level, R = 12.5, in the fourteen years of our study in August 2001, at which time it became unobservable due to its proximity to the Sun. Upon becoming observable again in mid-December 2001, 3C 279 fluctuated between R = 13.9 and R = 14.7, until a dramatic decrease in flux level in June-July 2002 brought the source back down to a level comparable to its pre-outburst state. The source exhibited numerous week-long flares of approximately one magnitude during the outburst period. Superposed on these flares were night-to-night variations of up to one half magnitude and intra-night microvariability of up to 0.13 magnitude in three hours. We use visual inspection of the light curve as well as numerical timescale analysis tools (the autocorrelation function, the structure function, and the power spectrum) to characterize the multiple timescales of variability ranging from 1.5 years to several hours.

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