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Hubble Space Telescope Observations of a Spectacular New Strong-lensing Galaxy Cluster - MACSJ1149.5+2223 at z=0.544
Graham P. Smith, Harald Ebeling, Marceau Limousin +9
We present Advanced Camera for Surveys observations of MACSJ1149.5+2223, an X-ray luminous galaxy cluster at z=0.544 discovered by the Massive Cluster Survey. The data reveal at le…
A Deeper Look at Leo IV: Star Formation History and Extended Structure
D. J. Sand, A. Seth, E. W. Olszewski +3
We present MMT/Megacam imaging of the Leo~IV dwarf galaxy in order to investigate its structure and star formation history, and to search for signs of association with the recently…
LoCuSS: First Results from Strong-lensing Analysis of 20 Massive Galaxy Clusters at z~0.2
Johan Richard, Graham P. Smith, Jean-Paul Kneib +13
We present a statistical analysis of a sample of 20 strong lensing clusters drawn from the Local Cluster Substructure Survey (LoCuSS), based on high resolution Hubble Space Telesco…
The Distribution of Dark Matter Over 3 Decades in Radius in the Lensing Cluster Abell 611
A. B. Newman, T. Treu, R. S. Ellis +5
We present a detailed analysis of the baryonic and dark matter distribution in the lensing cluster Abell 611 (z=0.288), with the goal of determining the dark matter profile over an…
The Star Formation History and Extended Structure of the Hercules Milky Way Satellite
D. J. Sand, E. W. Olszewski, B. Willman +5
We present imaging of the recently discovered Hercules Milky Way satellite and its surrounding regions to study its structure, star formation history and to thoroughly search for s…
A faint type of supernova from a white dwarf with a helium-rich companion
H. B. Perets, A. Gal-Yam, P. Mazzali +25
Supernovae (SNe) are thought to arise from two different physical processes. The cores of massive, short-lived stars undergo gravitational core collapse and typically eject a few s…