NOAO >   Observing Info >   Approved Programs >   2017A-0108

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Program Information for 2017A-0108


PI: C E Rusu, UC Davis, cerusu@ucdavis.edu
Address: Department of Physics, One Shields Ave., Davis, California 95616 USA

CoI: Chris Fassnacht, UC Davis
CoI: Kenneth Wong, NAOJ
CoI: Tommaso Treu, UCLA
CoI: Sherry Suyu, MPA
CoI: Matthew Auger, University of Cambridge
CoI: Thomas Collett, University of Portsmouth
CoI: Dominique Sluse, Liege
CoI: Vivien Bonvin, EPFL
CoI: Frederic Courbin, EPFL
CoI: Alessandro Sonnenfeld, Kavli IPMU
CoI: Adriano Agnello, ESO
CoI: Stefan Hilbert, MPA

Title: Quantifying mass structures along strong-lens lines of sight with ultraviolet observations

Abstract: Measuring cosmological parameters is a main goal of modern cosmology. The tension between low-redshift measurements of the Hubble constant (H$_0$) and that derived from the CMB under a flat LCDM model either implies new physics or the presence of systematic errors. We are undertaking a comprehensive effort to measure accurate cosmological parameters using time delays in gravitationally lensed quasars. Our published results from three systems achieve 3.8% precision on H0 and cosmological constraints comparable to current BAO/SNe studies. Aiming to achieve 2% precision on H0 (comparable to Cepheids), we are expanding the sample to nine lenses. We have obtained time delays and deep HST imaging for the full sample, but we need to track systematic uncertainties due to perturbations by mass along the line of sight. We request wide-field u-band imaging to improve photometric redshifts of galaxies in four lens fields where we currently lack multi-band wide- field data. This proposal complements a Gemini Telescope proposal through NOAO, which will provide the necessary $griK$ imaging.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017A):  WIYN/ODI -- 2n on May 25 - May 26 2017


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017A-0108

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