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For refcode 1997AJ....114..722R:
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1997AJ....114..722R TIME DILATION FROM SPECTRAL FEATURE AGE MEASUREMENTS OF TYPE Ia SUPERNOVAE A. G. RIESS, A. V. FILIPPENKO, AND D. C. LEONARD Department of Astronomy, University of California, Berkeley, California 94720-3411 Electronic mail; (ariess,alex,dleonard)@astro.berkeley.edu B. P. SCHMIDT Mt. Stromlo and Siding Springs Observatories, Australian National University, Private Bag, Weston Creek Post Office, ACT 2611, Australia Electronic mail; brian@mso.anu.edu.au N. SUNTZEFF, M. M. PHILLIPS, R. SCHOMMER, AND A. CLOCCHIATTI Cerro Tololo Inter-American Observatory, Casilla 603, La Silla, Chile Electronic mail; (nsuntzeff,mphillips,rschommer,aclocchiatti)@noao.edu R. P. KIRSHNER, P. GARNAVICH, AND P. CHALLIS Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge. Massachusetts 02138 Electronic mail; (kirshner,pgarnavich,pchallis)@cfa.harvard.edu B. LEIBUNDGUT AND J. SPYROMILIO European Southern Observatory. Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany Electronic mail; (bleibund,jspyromi)@eso.org R. C. SMITH Department of Astronomy, University of Michigan, 834 Dennison, Ann Arbor. Michigan 48109-1090 Electronic mail; clrrls@astro.lsa.umich.edu Received 1997 March 28; revised 1997 April 30 ABSTRACT We have developed a quantitative, empirical method for estimating the age of Type Ia supernovae (SNe Ia) from a single spectral epoch. The technique examines the goodness of fit of spectral features as a function of the temporal evolution of a large database of SNe Ia spectral features. When a SN Ia spectrum with good signal-to-noise ratio over the rest frame range 3800 to 6800 A is available, the precision of a spectral feature age (SFA) is (1{sigma}) ~1.4 days. SFA estimates are made for two spectral epochs of SN 1996bj ( z = 0.574) to measure the rate of aging at high redshift. In the 10.05 days which elapsed between spectral observations, SN 1996bj aged 3.35+/-3.2 days, consistent with the 6.38 days of aging expected in an expanding Universe and inconsistent with no time dilation at the 96.4% confidence level. The precision to which individual features constrain the supernova age has implications for the source of inhomogeneities among SNe Ia.
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