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10 papers · 1 filter
Mapping the Asymmetric Thick Disk: The Hercules Thick Disk Cloud
Jeffrey A. Larsen, Roberta M. Humphreys, Juan E. Cabanela
The stellar asymmetry of faint thick disk/inner halo stars in the first quadrant first reported by Larsen & Humphreys (1996) and investigated further by Parker et al. (2003, 2004)…
First-Year Spectroscopy for the SDSS-II Supernova Survey
Chen Zheng, Roger W. Romani, Masao Sako +77
This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band…
X-Ray and Optical Microlensing in the Lensed Quasar PG 1115+080
Christopher W. Morgan, Christopher S. Kochanek, Xinyu Dai +2
We analyzed the microlensing of the X-ray and optical emission of the lensed quasar PG 1115+080. We find that the effective radius of the X-ray emission is 1.3(+1.1 -0.5) dex small…
Simultaneous Estimation of Time Delays and Quasar Structure
Christopher W. Morgan, Michael E. Eyler, C. S. Kochanek +5
We expand our Bayesian Monte Carlo method for analyzing the light curves of gravitationally lensed quasars to simultaneously estimate time delays and quasar structure including the…
The Rewards of Patience: An 822 Day Time Delay in the Gravitational Lens SDSS J1004+4112
J. Fohlmeister, C. S. Kochanek, E. E. Falco +2
We present 107 new epochs of optical monitoring data for the four brightest images of the gravitational lens SDSS J1004+4112 observed between October 2006 and June 2007. Combining…
The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary
Joshua A. Frieman, B. Bassett, A. Becker +98
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (…