We present the results of a time analysis of some intranight light curves of BL Lacertae during the very active phase of June-September 1997. In particular, we studied the luminosity variations over time scales from 0.3 to 3 hours, after subtraction of longer trends. the data have been analyzed with several methods, including the non-linear Prony algorithm, to investigate the relation between the amplitudes and the durations of the variations. A non periodic oscillating behaviour with an approximate time scale of about two hours has been noticed in a few occasions. Possible implications on physical models based on synchrotron emission in a strong turbulent magnetic field are discussed.
Structure and Timescales of the Fast Variations of BL Lacertae during the 1997 Summer Active Phase
TOSTI, Gino;
1999
Abstract
We present the results of a time analysis of some intranight light curves of BL Lacertae during the very active phase of June-September 1997. In particular, we studied the luminosity variations over time scales from 0.3 to 3 hours, after subtraction of longer trends. the data have been analyzed with several methods, including the non-linear Prony algorithm, to investigate the relation between the amplitudes and the durations of the variations. A non periodic oscillating behaviour with an approximate time scale of about two hours has been noticed in a few occasions. Possible implications on physical models based on synchrotron emission in a strong turbulent magnetic field are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
