The 1997 Outburst of BL Lacertae and Detection of a 0.6-mag Rapid Variation

Details The 1997 Outburst of BL Lacertae and Detection of a 0.6-mag Rapid Variation The 1997 Outburst of BL Lacertae and Detection of a 0.6-mag Rapid Variation

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..253m&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.253-256.

Astronomy and Astrophysics

Astronomy

11

Accretion, Accretion Disks, Black Holes, Galaxies: Individual (Bl Lacertae)

Scientific paper

Photometric observations of BL Lac were carried out during the large optical and X-ray outburst in 1997. Time-resolved photometry on 1997 August 2 revealed a rapid increase of brightness by about 0.6 mag within 40 min. This large-amplitude, short-time variation is the most active one among known variability of blazars in the optical wavelength. By considering a model based on the ``synchrotron self-Compton model'' of the relativistic jets of blazars, the size of the variable source should be R ~ 7.2 x 10^{{14}} cm from the 40 min variation. The power-density spectrum of the light curve on the night yielded a dependence of the power to the frequency f^{{-1.0}} for timescales of the variabilities and down to a possible minimum timescale of around 10 min. The clear difference between the observed f^{{-1.0}} dependence from the canonical f^{{-1.5}} --f^{{-1.8}} power indices observed in X-ray variations of radio-loud AGNs suggests that different mechanisms are responsible for short-term optical variability between BL Lacs and radio-loud AGNs.

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