Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-03
Astronomy and Astrophysics
Astrophysics
20 pages, 11 included figures, aipproc style file included, to appear in Second Tropical Workshop on Particle Physics and Cosm
Scientific paper
10.1063/1.1328887
We review the use of Type Ia supernovae for cosmological distance determinations. Low-redshift SNe Ia (z < 0.1) demonstrate that the Hubble expansion is linear, that H_0 = 65 +/- 2 (statistical) km/s/Mpc, and that the properties of dust in other galaxies are similar to those of dust in the Milky Way. We find that the light curves of high-redshift (z = 0.3-1) SNe Ia are stretched in a manner consistent with the expansion of space; similarly, their spectra exhibit slower temporal evolution (by a factor of 1 + z) than those of nearby SNe Ia. The luminosity distances of our first set of 16 high-redshift SNe Ia are, on average, 10-15% farther than expected in a low mass-density (Omega_M=0.2) universe without a cosmological constant. Preliminary analysis of our second set of 9 SNe Ia is consistent with this. Our work supports models with positive cosmological constant and a current acceleration of the expansion. We address the main potential sources of systematic error; at present, none of them appears to reconcile the data with Omega_Lambda=0 and q_0 >= 0. The dynamical age of the Universe is estimated to be 14.2 +/- 1.7 Gyr, consistent with the ages of globular star clusters.
Filippenko Alexei V.
Riess Adam G.
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