5 Matching Results

Search Results

Advanced search parameters have been applied.
in creator/contributor: "Morokuma, T"  
Results: 1 - 5
open access

A New Determination of the High Redshift Type Ia Supernova Rateswith the Hubble Space Telescope Advanced Camera for Surveys

Description: We present a new measurement of the volumetric rate of Type Ia supernova up to a redshift of 1.7, using the Hubble Space Telescope (HST) GOODS data combined with an additional HST dataset covering the North GOODS field collected in 2004. We employ a novel technique that does not require spectroscopic data for identifying Type Ia supernovae (although spectroscopic measurements of redshifts are used for over half the sample); instead we employ a Bayesian approach using only photometric data to ca… more
Date: October 1, 2007
Creator: Kuznetsova, N.; Barbary, K.; Connolly, B.; Kim, A.G.; Pain, R.; Roe, N.A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Sloan Digital Sky Survey Quasar Lens Search. Ii. Statistical Lens Sample From Thethird Data Release

Description: We report the first results of our systematic search for strongly lensed quasars using the spectroscopically confirmed quasars in the Sloan Digital Sky Survey (SDSS). Among 46,420 quasars from the SDSS Data Release 3 ({approx}4188 deg{sup 2}), we select a subsample of 22,683 quasars that are located at redshifts between 0.6 and 2.2 and are brighter than the Galactic extinction corrected i-band magnitude of 19.1. We identify 220 lens candidates from the quasar subsample, for which we conduct ext… more
Date: September 13, 2007
Creator: Inada, N.; Oguri, M.; Becker, R. H.; Shin, M.; Richards, G. T.; Hennawi, J. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Sloan Digital Sky Survey Quasar Lens Search. III Constraints on Dark Energy From The Third Data Release Quasar Lens Catalog

Description: We present cosmological results from the statistics of lensed quasars in the Sloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account of the selection function, we compute the expected number of quasars lensed by early-type galaxies and their image separation distribution assuming a flat universe, which is then compared with 7 lenses found in the SDSS Data Release 3 to derive constraints on dark energy under strictly controlled criteria. For a cosmological constant model (w … more
Date: September 12, 2007
Creator: Oguri, M.; Inada, N.; Strauss, M. A.; Kochanek, C. S.; Richards, G. T.; Schneider, D. P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study

Description: We develop a method to measure the strength of the absorption features in type Ia supernova (SN Ia) spectra and use it to make a quantitative comparisons between the spectra of type Ia supernovae at low and high redshifts. In this case study, we apply the method to 12 high-redshift (0.212 = z = 0.912) SNe Ia observed by the Supernova Cosmology Project. Through measurements of the strengths of these features and of the blueshift of theabsorption minimum in Ca ii H&K, we show that the spectra… more
Date: March 24, 2008
Creator: Supernova Cosmology Project
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen