Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..558..664z&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: International Symposium. AIP Conference Proceedings, Volume 558, pp. 664-667 (2001).
Astronomy and Astrophysics
Astronomy
Active And Peculiar Galaxies And Related Systems, X-Ray
Scientific paper
MKN 421, repeatedly monitored with BeppoSAX in 1997-2000, showed recurrent ~1 day duration flares with quasi-symmetric profiles. We show here the most important results of our comprehensive temporal analysis aiming at quantifying time lags between low and high energy photons. Interestingly, time lags were detected in each isolated flare, and constrained to a small range from flare to flare (~1 hour between the 0.1-1.5 keV and the 3.5-10 keV bands) with various attributes: soft lags, hard lags or zero lags, but no correlation between time lags and flare intensities was found. To account for variable time lags, relative changes of values in the dominant time scales involved in the emitting region must occur in order to produce a variety of complex energy-dependent variability behaviors. The energy-dependence of time lags was well determined for the flares in which a large enough time lags is detected, from which magnetic fields have been constrained to be 0.15-3.0 Gauss (assuming Doppler factor δ=20), if soft and hard lags are simply related to the energy-dependent synchrotron cooling and acceleration time scales, respectively. Both symmetric structure and time lags detected in some flares indicate that the emitting region sizes are energy-dependent. .
Celotti Annalisa
Fossati Giovanni
Treves Aldo
Zhang Ying Hui
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