activity
19982026
most citedSteps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-Based Monitoring of 3C 390.3

114 citations · 313 across the 23 of their papers we have counts for

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astro-ph.CO2023

Are "Changing-Look'' Active Galactic Nuclei Special in the Coevolution of Supermassive Black Holes and their Hosts? I

J. Wang, W. K. Zheng, T. G. Brink +5

The nature of the so-called ``changing-look'' (CL) active galactic nucleus (AGN), which is characterized by spectral-type transitions within ~yr, remains an open question.…

astro-ph.CO2011★ 4 cited

Very Early Photometry of SN 1998S: Physical Parameters and Date of Explosion

H. Poon, J. C. S. Pun, T. Y. Lam +2

Context. We present very early optical lightcurves beginning 10 days before maximum of the Type IIn supernova 1998S, covering the first four months after discovery. Aims. We examin…