Optical R-band variability of seven X-ray-selected BL Lacertae objects

Details Optical R-band variability of seven X-ray-selected BL Lacertae objects Optical R-band variability of seven X-ray-selected BL Lacertae objects

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.398..832k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 398, Issue 2, pp. 832-840.

Astronomy and Astrophysics

Astronomy

3

Galaxies: Active, Bl Lacertae Objects: General, Galaxies: Photometry

Scientific paper

This paper presents the results of optical CCD photometry in the Cousins R band for seven X-ray-selected BL Lacertae objects. Observations have been performed with the 70-cm meniscus telescope of Abastumani Astrophysical Observatory, Georgia. The data obtained provide important information on sources that have been rarely observed in the optical band. The targets show clear long-term variability with time-scales of 1.5-5 yr. The maximum amplitudes are slightly greater than 1 mag. 1ES 0323+022, 0502+675 and 0806+524 show clear non-periodical behaviour. 1ES 1028+511 changes quasi-periodically but further monitoring for periodicity confirmation and period derivation is needed. Overall brightness variation is maximal for 1ES 0647+250 with ΔR = 1.29 mag. Two-peak maxima, indicating the existence of reverse shocks in blazar jets, are observed for 1ES 0502+675, 0647+250, 0806+524 and 1517+656. The targets do not show intra-night variability. Day-to-day changes with amplitudes of 0.1-0.32 mag coincide mainly with short-term bursts. The latter are seen at faint (quiet) stages as during flaring activities. This fact leads to the suggestion that both hot-spot and shock-in-jet models explaining the origin of short-term bursts should be reasonable.

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