Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..217..358p&link_type=abstract
International Astronomical Union Symposium no. 217, held 14-17 July, 2003 in Sydney, Australia. Edited by P.-A. Duc, J. Braine
Astronomy and Astrophysics
Astronomy
Scientific paper
Observational data from the X-ray through the UV and optical of variations of the NGC 4151 nucleus were compiled. The characteristics of the variability related to the 1989-1996 cycle of activity show remarkable similarity to those of blazars and do not contradict the supposition that this cycle of activity was caused by a synchrotron jet (SJ). Some of the activity of previous cycles were interpreted in the framework of a SJ model and some of that of a disc instability model (DI). We ask the question if different cycles of activity can be of a different nature caused by a different accretion rate.
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