activity
19982002
most citedSteps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548

201 citations · 231 across the 2 of their papers we have counts for

collaborators
Showing 2001Show all

1 paper · 1 filter

astro-ph2001★ 30 cited

Optical observations of BL Lacertae from 1997 to 1999

J. H. Fan, B. C. Qian, J. Tao

We present the optical (V, R, and I) photometry for BL Lacertae, which was observed from 1997 through 1999, with the 1.56-m telescope at the Shanghai astronomical observatory (SHAO…