Mathematics – Logic
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr.7wk02k&link_type=abstract
American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #7WK.02
Mathematics
Logic
Scientific paper
The High-Z Supernova Team is an international collaboration formed to discover and monitor type Ia supernovae at z > 0.2 with the aim of measuring cosmic deceleration and global curvature. Our collaboration has also pursued a basic understanding of supernovae in the nearby Universe, discovering and observing a large sample of objects on which the cosmological inferences can be based, and devising methods, such as the Multicolor Light Curve Shape method for measuring precise luminosity distances. MLCS When combined with HST-based measurements of distances by Sandage and his collaborators to galaxies in which type Ia supernovae have erupted, this gives a very precise value for the Hubble constant of 68 ± 3, with a systematic uncertainty that is due to the remaining uncertainties in the Cepheid scale. The measurements also provide stringent tests for variations in the Hubble flow and tests for the linearity of the Hubble law. At redshifts above 0.2, the High-Z Team has discovered over 70 objects, and has good measurements in hand for about 35, mostly from the ground, but also including HST measurements of 3. One of these has a redshift of 0.97. Carefully calibrated light curves for some of these supernovae are now in hand. The preliminary results Garanvich et al- 1 Feb 98 Ap J Lett point to a low value of Ω and leave room for a non-zero Λ if space is flat. A universe which is closed by matter alone is excluded at the 95% level by these early results. New measurements should triple the sample of high-z supernovae in our analysis by the time of this meeting, and much stronger constraints are likely. Then the discussion will properly shift to the possible systematic errors in this approach, including sample bias, reddening effects, and the consequences of chemical evolution and stellar populations on supernova properties.
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