2.7k citations · 37k across the 285 of their papers we have counts for
9 papers · 2 filters
"Hidden" Seyfert 2 Galaxies and the X-ray Background
E. C. Moran, A. V. Filippenko, R. Chornock
Obscured active galactic nuclei, which are classified optically as type 2 (narrow-line) Seyfert galaxies in the local universe, are by far the most promising candidates for the ori…
The magnification of SN 1997ff, the farthest known Supernova
Narciso Benitez, Adam G. Riess, Peter E. Nugent +3
With a redshift of z~1.7, SN 1997ff is the most distant type Ia supernova discovered so far. This SN is close to several bright, z=0.6-0.9 galaxies, and we consider the effects of…
Evidence for Extremely High Dust Polarization Efficiency in NGC 3184
Douglas C. Leonard, Alexei V. Filippenko, Ryan Chornock +1
Recent studies have found the Type II-plateau supernova (SN) 1999gi to be highly polarized (p_max = 5.8%, where p_max is the highest degree of polarization measured in the optical…
Steps 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
B. M. Peterson, the International AGN Watch
We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548. The data base…
A Study of the Type II-Plateau Supernova 1999gi, and the Distance to its Host Galaxy, NGC 3184
Douglas C. Leonard, Alexei V. Filippenko, Weidong Li +10
We present optical spectra and photometry sampling the first six months after discovery of supernova (SN) 1999gi in NGC 3184. SN 1999gi is shown to be a Type II-plateau event with…
Photospheric-Phase Spectropolarimetry and Nebular-Phase Spectroscopy of the Peculiar Type Ic Supernova 2002ap
Douglas C. Leonard, Alexei V. Filippenko, Ryan Chornock +1
The early-time optical spectrum of the Type Ic supernova (SN) 2002ap was characterized by unusually broad features, leading some authors to designate it a "hypernova." We present o…