Optical Monitoring of Three Gamma-Ray-loud BL Lacertae Objects in 1999-2002

Details Optical Monitoring of Three Gamma-Ray-loud BL Lacertae Objects in 1999-2002 Optical Monitoring of Three Gamma-Ray-loud BL Lacertae Objects in 1999-2002

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....128.1929z&link_type=abstract

The Astronomical Journal, Volume 128, Issue 5, pp. 1929-1941.

Astronomy and Astrophysics

Astronomy

16

Galaxies: Bl Lacertae Objects: General, Gamma Rays: Observations

Scientific paper

We present the results of optical photometric (BVRI) monitoring of three gamma-ray-loud BL Lac objects (3C 66A, PKS 0735+178, and BL Lacertae) in 1999-2002. During our observations, these objects showed significant rapid variations: 3C 66A and PKS 0735+178 exhibit short-timescale (~1 hr) variability in the B band, and BL Lac exhibits intraday variability in B and V. We find that there is a strong correlation between brightness and color for 3C 66A and BL Lac. We have analyzed the relationship between optical variability and gamma-ray variability and discuss theoretical models for gamma-ray-loud BL Lac emission. We have found shorter time variability for 3C 66A and PKS 0735+178 compared with previous reports.

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