Monitoring the Optical Spectrum of BL Lacertae

Details Monitoring the Optical Spectrum of BL Lacertae Monitoring the Optical Spectrum of BL Lacertae

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jsara...3...36s&link_type=abstract

Journal of the Southeastern Association for Research in Astronomy, vol. 3, p. 36

Astronomy and Astrophysics

Astronomy

Blazar: General, Blazar: Individual: Bl Lac, Blazar: Optical Spectrum, Blazar: Microvariability

Scientific paper

BV RI data from November 1999 through June 2008 were compiled in order to monitor the long- term optical spectrum of BL Lac. Spectral slopes were calculated for approximately 35 nights, using either BV R or V RI observations. Slope-versus-V -magnitude figures were constructed to explore possible correlations. Spectral flattening with increase in V -magnitude was found for both BV R and V RI data sets, but with a small correlation coefficient. Ten of the 35 data sets were tested for microvariability, with only two testing positive. No correlation was found between magnitude and occurrence of microvariations or between spectral slope and microvariations. We show that there is only one synchrotron component in the optical range.

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