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Characteristic X-ray Variability of TeV Blazars: Probing the Link between the Jet and the Central Engine | Jun Kataoka
; Tadayuki Takahashi
; Stefan J. Wagner
; Naoko Iyomoto
; Philip G. Edwards
; Kiyoshi Hayashida
; Susumu Inoue
; Greg M. Madejski
; Fumio Takahara
; Chiharu Tanihata
; Nobuyuki Kawai
; | Date: |
2 May 2001 | Journal: | Astrophys.J. 560 (2001) 659 | Subject: | astro-ph | Abstract: | We have studied the rapid X-ray variability of three extragalactic TeV gamma-ray sources; Mrk 421, Mrk 501 and PKS 2155-304. Analyzing the X-ray light curves obtained from ASCA and/or RXTE observations between 1993 and 1998, we have investigated the variability in the time domain from 10^3 to 10^8 sec. For all three sources, both the power spectrum density (PSD) and the structure function (SF) show a roll-over with a time-scale of the order of 1 day or longer, which may be interpreted as the typical time-scale of successive flare events. Although the exact shape of turn-over is not well constrained and the low-frequency (long time-scale) behavior is still unclear, the high-frequency (short time-scale) behavior is clearly resolved. We found that, on time-scales shorter than 1 day, there is only small power in the variability, as indicated by a steep power spectrum density of f^{-2~-3}. This is very different from other types of mass-accreting black-hole systems for which the short time-scale variability is well characterized by a fractal, flickering-noise PSD (f^{-1~-2}). The steep PSD index and the characteristic time-scale of flares imply that the X-ray emitting site in the jet is of limited spatial extent; D > 10^{17} cm distant from the base of the jet, which corresponds to > 100 Schwarzschild radii for 10^{7-10} M_solar black-hole systems. | Source: | arXiv, astro-ph/0105022 | Services: | Forum | Review | PDF | Favorites |
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