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The reverse shock of SNR1987A at 18 years after outburst
Nathan Smith, Svetozar A. Zhekov, Kevin Heng +3
We use low-dispersion spectra obtained at the Magellan Observatory to study the broad H-alpha emission from the reverse shock of the infant supernova remnant SNR1987A. These spectr…
Virial masses and the baryon fraction in galaxies
H. Hoekstra, B. C. Hsieh, H. K. C. Yee +2
We have measured the weak lensing signal as a function of restframe luminosity for a sample of `isolated' galaxies. These results are based on four-band photometry from the Red-Seq…
The Progenitors of Short-Hard Gamma-Ray Bursts from an Extended Sample of Events
Avishay Gal-Yam, Ehud Nakar, Eran Ofek +11
The detection of the afterglow emission and host galaxies of short-hard gamma-ray bursts (SHBs) is one of the most exciting recent astronomical discoveries. Indications that SHB pr…
Submillimeter Imaging of RCS022434-0002.5: Intense Activity in a High-Redshift Cluster?
T. M. A. Webb, H. K. C. Yee, R. J. Ivison +4
We present deep 850micron imaging of the z=0.773 strong lensing galaxy cluster RCSJ022434-0002.5 from the Red-Sequence Cluster Survey (RCS). These data are part of a larger submill…
The Dependence of Galaxy Colors on Luminosity and Environment at z~0.4
H. K. C. Yee, B. C. Hsieh, Huan Lin +1
We analyse the B-R_c colors of galaxies as functions of luminosity and local galaxy density using a large photometric redshift catalog based on the Red-Sequence Cluster Survey. We…
The Afterglows, Redshifts, and Properties of Swift Gamma-Ray Bursts
E. Berger, S. R. Kulkarni, D. B. Fox +29
We present optical, near-IR, and radio follow up of sixteen Swift bursts, including our discovery of nine afterglows and a redshift determination for three. These observations, sup…
Closing in on a Short-Hard Burst Progenitor: Constraints from Early-Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b
J. S. Bloom, J. X. Prochaska, D. Pooley +25
The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to the nearly immediate relay of the GRB position by Swift, we began imaging the GRB…
A Photometric Redshift Galaxy Catalog from the Red-Sequence Cluster Survey
B. C. Hsieh, H. K. C. Yee, H. Lin +1
The Red-Sequence Cluster Survey (RCS) provides a large and deep photometric catalog of galaxies in the and bands for ~90 square degrees of sky, and supplemental and…