Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae

Details Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.8503g&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #85.03; Bulletin of the American Astronomical Society, Vol. 29, p.1350

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Scientific paper

We have coordinated Hubble Space Telescope photometry with ground-based discovery for three supernovae: two SN Ia 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. The HST data combined with ground-based photometry provide good temporal coverage. We use these light curves and relations between luminosity, light curve shape, and color calibrated from low-z samples to derive relative luminosity distances which are accurate to 10%\ at z ~ 0.5 and 20%\ at z=1. The redshift-distance relation is used to place constraints on the global mean matter density, Omega_m , and the normalized cosmological constant, Omega_ Lambda . When the HST \ sample is combined with the distance to SN 1995K (z=0.48), analyzed by the same precepts, it suggests that matter alone is insufficient to produce a flat Universe. Specifically, for Omega_m +Omega_ Lambda =1, Omega_m is less than 1 with >95%\ confidence, and our best estimate of Omega_m is -0.1 +/- 0.5 if Omega_ Lambda =0. Although the present 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.

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