Observation of Cosmological Time Dilation using Type Ia Supernovae as Clocks
Abstract
This work is based on the first results from a systematic search for high redshift Type Ia supernovae. Using filters in the R-band we discovered seven such SNe, with redshift z = 0.3 - 0.5, before or at maximum light. Type Ia SNe are known to be a homogeneous group of SNe, to first order, with very similar light curves, spectra and peak luminosities. In this talk we report that the light curves we observe are all broadened (time dilated) as expected from the expanding universe hypothesis. Small variations from the expected 1+z broadening of the light curve widths can be attributed to a width-brightness correlation that has been observed for nearby SNe (z<0.1). We show in this talk the first clear observation of the cosmological time dilation for macroscopic objects.
Cite
@article{arxiv.astro-ph/9602124,
title = {Observation of Cosmological Time Dilation using Type Ia Supernovae as Clocks},
author = {G. Goldhaber and S. Deustua and S. Gabi and D. Groom and I. Hook and A. Kim and M. Kim and J. Lee and R. Pain and C. Pennypacker and S. Perlmutter and I. Small and A. Goobar and R. Ellis and K. Glazebrook and R. McMahon and B. Boyle and P. Bunclark and D. Carter and M. Irwin and H. Newberg and A. V. Filippenko and T. Matheson and M. Dopita and J. Mould and W. Couch},
journal= {arXiv preprint arXiv:astro-ph/9602124},
year = {2007}
}
Comments
8 pages, 3 Postscript figures, uuencoded uses crckapb.sty and psfig.sty. To appear in Thermonuclear Supernovae (NATO ASI), eds. R. Canal, P. Ruiz-LaPuente, and J. Isern. Postscript version is also available at http://www-supernova.lbl.gov/