Photometric reverberation mapping of Markarian 279
  By using standard broad-band VRI photometry we were able to discriminate the variations of the broad hydrogen alpha line from the continuum variations for the active galaxy Mkn 279. Cross-correlating both light curves enabled us to determine the time lag of the broad line variations behind the continuum and thus to determine the BLR size (about 8 light days). Our preliminary results are rather consistent with the spectroscopic reverberation mapping results (about 12/17 days). This study is a part of an ambitious program to perform photometric reverberation mapping and determine BLR sizes (respectively - the central black hole masses) for more that 100 nearby AGN. 
R. Bachev, A. Strigachev, E. Semkov, S. Boeva, S. Peneva, S. Ibryamov,   K. Stoyanov, B. Spassov, S. Tsvetkova, B. Mihov, G....
astro-ph.GA astro-ph.CO