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Astrophysics Luncheon Seminar

Cosmic Shear Results from the Deep Lens Survey
Presented by James Jee
University of California Davis

Monday, April 1, 2013
12:00 noon in 169-336

Abstract
After providing a brief introduction to gravitational lensing using my water-n-ripple analogy, I will present a cosmic shear study from the Deep Lens Survey (DLS). DLS is a deep BVRz multi-band imaging survey of five 4 sq. degree fields with two National Optical Astronomy Observatory (NOAO) 4-meter telescopes at Kitt Peak and Cerro Tololo. I will highlight our extensive efforts to separate the instrumental systematics from real lensing signals, which is the major challenge for future cosmic shear surveys like LSST. The resulting cosmological parameters favored by the DLS cosmic shear analysis will be discussed. If time permits, I am also going to present our new ACS analysis of the "train wreck" cluster (A520), where we previously reported a discovery of the "dark core". This re-analysis confirms our previous claim that a significant mass is present near the peak of the X-ray emission, however, without any apparent concentration of giant cluster galaxies.


SVCP Astrophysics


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