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A supernova at Z = 0.458 and implications for measuring the cosmological deceleration
Perlmutter, S.; Pennypacker, C. R.; Goldhaber, G.; Goobar, A.; Muller, R. A.; Newberg, H. J. M.; Desai, J.; Kim, A. G.; Kim, M. Y.; Small, I. A.; Boyle, B. J.; Crawford, C. S.; McMahon, R. G.; Bunclark, P. S.; Carter, D.; Irwin, M. J.; Terlevich, R. J.; Ellis, R. S.; Glazebrook, K.; Couch, W. J.; Mould, J. R.; Small, T. A.; Abraham, R. G.
AA(University of California, Berkeley, CA, US), AB(University of California, Berkeley, CA, US), AC(University of California, Berkeley, CA, US), AD(University of California, Berkeley, CA, US), AE(Lawrence Berkeley Laboratory, Berkeley, CA, US), AF(Lawrence Berkeley Laboratory, Berkeley, CA, US), AG(Lawrence Berkeley Laboratory, Berkeley, CA, US), AH(Lawrence Berkeley Laboratory, Berkeley, CA, US), AI(Lawrence Berkeley Laboratory, Berkeley, CA, US), AJ(Lawrence Berkeley Laboratory, Berkeley, CA, US)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 440, no. 2, p. L41-L44 (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Cosmology, Deceleration, Error Analysis, Red Shift, Supernovae, Charge Coupled Devices, Dark Matter, Light Curve, Stellar Spectrophotometry
Bibliographic Code:


We have begun a program to discover high-redshift supernovae (z approximately equals to 0.25-0.5) and study them with follow-up photometry and spectroscopy. We report here our first discovery, a supernova at z = 0.458. The photometry for this supernova closely matches the light curve calculated for this redshift from the template of well-observed nearby Type Ia supernovae. We discuss the measurement of the deceleration parameter q0 using such high-redshift supernovae and give the best fit value assuming this one supernova is a normal, unextincted Type Ia. We describe the main sources of error in such a measurement of q0 and ways to reduce these errors.

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