Optical Outbursts of the Blazar BL Lacertae in 2000-2001

Details Optical Outbursts of the Blazar BL Lacertae in 2000-2001 Optical Outbursts of the Blazar BL Lacertae in 2000-2001

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9810b&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #98.10; Bulletin of the American Astronomical Society, Vol. 33, p.1454

Astronomy and Astrophysics

Astronomy

Scientific paper

BL Lacertae (2200+420; z=0.0686) is a well-known blazar that exhibits rapid and often large changes in flux in all wavebands. In the optical bands, this source is extremely variable on all time scales that have been monitored. Because of this rapid and complex variability behavior, the study of this object can benefit from monitoring at several observatories. In this spirit, observations from Colgate University's Foggy Bottom Observatory and Connecticut College's Olin Observatory were conflated to produce a more complete, better sampled, light curve. We chronicle the most recent variability of this classic AGN over a one and a half year interval, focusing on microvariability. We present new optical (R filter) CCD photometric observations of BL Lac covering the time from June 2000 through November 2001. At the start and end of this interval the source was relatively inactive, around R=14.3. During the intervening period it was in an active phase exhibiting several distinct outbursts. We obtained improved sampling during one outburst, lasting from May through August 2001, that reached a peak brightness of R=12.5 in July. On several nights, we found microvariability on the order of 0.1 magnitude within one to two hours. We did not see variations greater than 0.3 magnitude between nights, althought this limit may be set by undersampling. This hour to day variability is less extreme than that observed in the outburst of 1997.

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