Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.329..689x&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 329, Issue 4, pp. 689-699.
Astronomy and Astrophysics
Astronomy
37
Galaxies: Active, Bl Lacertae Objects: General, Galaxies: Jets, Galaxies: Nuclei, Galaxies: Photometry, Gamma-Rays: Observations
Scientific paper
We present the results of our monitoring the flux variability of 12 BL Lac objects, which have variabilities on time-scales ranging from hours to months. Individual sources are discussed in detail. Three of them, OY091, H0548-322 and 0048-097, show significant rapid variation (hours). Two of them, 3C 66A and Mrk 501, exhibit significant variability on time-scales of months. We find that 3C 66A has a variability period of 63+/-5d, supporting the 65-d period obtained by Lainela et al. The periodicity seems to be weak according to the Jurkevich Vm2 test. We also find a correlation between B-V colour index and B magnitude for Mrk 421. We discuss possible physical mechanisms on the basis of these observational phenomena.
Bai Jin-Ming
Dai Ben Zhong
Li Kwok Hung
Liang E.-W.
Liu Wende
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