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A Population of Intergalactic Supernovae in Galaxy Clusters
Avishay Gal-Yam, Dan Maoz, Puragra Guhathakurta +1
We have discovered seven type Ia cluster supernovae (SNe) in the course of the Wise Observatory Optical Transients Search in the fields of galaxy clusters with redshifts between z=…
Emission and Absorption in the M87 LINER
B. M. Sabra, J. C. Shields, L. C. Ho +2
The nucleus of M87 displays a LINER spectrum at optical wavelengths, with a nuclear disk of nebulosity that is resolved by the Hubble Space Telescope. We present new results from o…
A Search for Core-Collapse Supernova Progenitors In Hubble Space Telescope Images
Schuyler D. Van Dyk, Weidong Li, Alexei V. Filippenko
Identifying the massive progenitor stars that give rise to core-collapse supernovae (SNe) is one of the main pursuits of supernova and stellar evolution studies. Using ground-based…
Axisymmetric Dynamical Models of the Central Regions of Galaxies
Karl Gebhardt, Douglas Richstone, Scott Tremaine +12
We present axisymmetric, orbit superposition models for 12 galaxies using data taken with the Hubble Space Telescope (HST) and ground-based observatories. In each galaxy, we detect…
"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 Progenitor of Supernova 1993J Revisited
S. D. Van Dyk, P. M. Garnavich, A. V. Filippenko +4
From Hubble Space Telescope images with 0.05" resolution we identify four stars brighter than V=25 mag within 2.5" of SN 1993J in M81 which contaminated previous ground-based brigh…