BibTeX
@MISC{03supernovae,
author = {},
title = {SUPERNOVAE},
year = {2003}
}
Share
 |
 |
 |
 |
||
OpenURL
Abstract
We report measurements of M, , and w from 11 supernovae (SNe) at z 0:36 0:86 with high-quality light curves measured using WFPC2 on the Hubble Space Telescope (HST). This is an independent set of high-redshift SNe that confirms previous SN evidence for an accelerating universe. The high-quality light curves available from photometry on WFPC2 make it possible for these 11 SNe alone to provide measurements of the cosmological parameters comparable in statistical weight to the previous results. Combined with earlier Supernova Cosmology Project data, the new SNe yield a measurement of the mass density M 0:25þ0:07 0:06 ðstatisticalÞ 0:04 (identified systematics), or equivalently, a cosmological constant of 0:75þ0:06 0:07 ðstatisticalÞ 0:04 (identified systematics), under the assumptions of a flat universe and that the dark energy equation-of-state parameter has a constant value w 1. When the SN results are combined with independent flat-universe measurements of M from cosmic microwave background and galaxy redshift distortion data, they provide a measurement of w 1:05þ0:15 0:20 ðstatisticalÞ 0:09 (identified systematic), if w is assumed to be constant in time. In addition to high-precision light-curve measurements, the new data offer greatly improved color measurements of the high-redshift SNe and hence improved host galaxy extinction
Keyphrases
high-quality light curve high-redshift sne color measurement new sne yield cosmological constant cosmic microwave background new data mass density previous result supernova cosmology project data accelerating universe cosmological parameter galaxy redshift distortion data hubble space telescope independent set host galaxy extinction constant value flat universe previous sn evidence statistical weight dark energy equation-of-state parameter high-precision light-curve measurement independent flat-universe measurement sn result
