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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…
Not Color Blind: Using Multiband Photometry to Classify Supernovae
Dovi Poznanski, Avishay Gal-Yam, Dan Maoz +3
Large numbers of supernovae (SNe) have been discovered in recent years, and many more will be found in the near future. Once discovered, further study of a SN and its possible use…
A Hubble Space Telescope Snapshot Survey of Nearby Supernovae
Weidong Li, Alexei V. Filippenko, Schuyler D. Van Dyk +4
We present photometry of 12 recent supernovae (SNe) recovered in a {\it Hubble Space Telescope} Snapshot program, and tie the measurements to earlier ground-based observations, in…