Evidence for a characteristic time-scale in the X-ray light curves of TeV blazars

Details Evidence for a characteristic time-scale in the X-ray light curves of TeV blazars Evidence for a characteristic time-scale in the X-ray light curves of TeV blazars

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..558..660k&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: International Symposium. AIP Conference Proceedings, Volume 558, pp. 660-663 (2001).

Astronomy and Astrophysics

Astronomy

1

Active And Peculiar Galaxies And Related Systems, X-Ray

Scientific paper

We have studied the rapid X-ray variability of four TeV blazars, Mrk 421, Mrk 501, PKS 2155-304 and 1ES 2344+514. Analyzing the X-ray light curves obtained from ASCA and/or RXTE observations, we have investigated the variability in the time domain from 103 to 107 sec. The structure functions show a roll-over around 1 day, which can be interpreted as the typical time-scale of day-by-day flare events. On time-scales shorter than 1 day, variability is significantly suppressed, indicating a steep power spectrum density (PSD) of f-2~-3. This is very different from other types of mass-accreting black-hole systems for which the short timescale variability is well characterized by a fractal, flickering noise (f-1~-2). Importantly, the steep PSD index and the characteristic time-scale of day-by-day flares imply that the X-ray emitting site in the jet is of limited spatial extent; D~=1017-18 cm distant from the base of the jet, which corresponds to ~=102-4Rg for 107-9Msolar black-hole systems. .

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