Photometric Redshifts and Signal-to-Noise (2007)
Margoniner, V. E., Wittman, D. M.
We investigate the impact of photometric signal-to-noise (S/N) on the precision of photometric redshifts in multi-band imaging surveys, using both simulations and real data. We simulate the optical...
Weak Lensing Detection of Cl 1604+4304 at z = 0.90 (2004)
Margoniner, V. E., Lubin, L. M., Wittman, D. M., Squires, G. K.
We present a weak lensing analysis of the high-redshift cluster Cl 1604+4304. At z=0.90, this is the highest-redshift cluster yet detected with weak lensing. It is also one of a sample of...
The Deep Lens Survey Transient Search I : Short Timescale and Astrometric Variability (2004)
Becker, A. C., Wittman, D. M., Boeshaar, P. C., Clocchiatti, A., Dell'Antonio, I. P., Frail, D. A., ...
We report on the methodology and first results from the Deep Lens Survey transient search. We utilize image subtraction on survey data to yield all sources of optical variability down to 24th...
LSST: a Complementary Probe of Dark Energy (2002)
Tyson, J. A., Wittman, D. M., Hennawi, J. F., Spergel, D. N.
The number of mass clusters and their distribution in redshift are very sensitive to the density of matter Omega_m and the equation of state of dark energy w. Using weak lens gravitational tomography...
Gray Lloyd--Hart, T. Martinez, L. M. Close, G. Brusa, D. G. Bruns, B. A. Mcleod, ...
A new adaptive optics system has been constructed for moderately high resolution in the near infrared at the Multiple Mirror Telescope (MMT). The system, called FASTTRAC II, has been designed to...