1997/10/13 by P. Garnavich, P. M. Garnavich, R. P. Kirshner +29 · 16 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Cosmic distance ladder #Galaxy #Gamma-ray bursts and supernovae #Hubble space telescope #Hubble's law #Light curve #Luminosity #Luminosity distance #Observational cosmology #Photometry (optics) #Physics #Redshift #Stars #Stellar, planetary, and galactic studies #Supernova #astro-ph
paper · pdf · doi:10.1086/311140
published as Astrophys.J. 493 (1998) L53-57 · Submitted to ApJ Letters, 3 figures, 1 plate, additional table
arxiv created 1997/10/13 · openalex publication_date 1998/02/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have coordinated Hubble Space Telescope ( HST ) photometry with ground-based discovery for three supernovae: Type Ia supernovae near z ≈ 0.5 (SN 1997ce, SN 1997cj) and a third event at z = 0.97 (SN 1997ck). The superb spatial resolution of HST separates each supernova from its host galaxy and leads to good precision in the light curves. We use these light curves and relations between luminosity, light-curve shape, and color calibrated from low- z samples to derive relative luminosity distances that are accurate to 10% at z ≈ 0.5 and 20% at z = 1. When the HST sample is combined with the distance to SN 1995K ( z = 0.48), analyzed by the same precepts, we find that matter alone is insufficient to produce a flat universe. Specifically, for Ω m +Ω Λ = 1, Ω m is less than 1 with more than 95% confidence, and our best estimate of Ω m is -0.1±0.5 if Ω Λ = 0. Although this result is based on a very small sample whose systematics remain to be explored, it demonstrates the power of HST measurements for high-redshift supernovae.