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Issue A&A
Volume 415, Number 3, March I 2004
Page(s) 863 - 878
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20031616



A&A 415, 863-878 (2004)
DOI: 10.1051/0004-6361:20031616

Results of the Mount Stromlo Abell cluster supernova search

L. M. Germany1, 2, D. J. Reiss3, B. P. Schmidt4, C. W. Stubbs3 and N. B. Suntzeff5

1  European Southern Observatory, Casilla 19001, Santiago, Chile
2  Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories. The National Optical Astronomy Observatories is operated by the Associated Universities for Research in Astronomy (AURA), Inc. under cooperative agreement with the National Science Foundation
3  University of Washington, Box 351580, Seattle, WA, USA
4  Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia
5  Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, Casilla 603, La Serena, Chile

(Received 9 September 2002 / Accepted 13 October 2003 )

Abstract
We report the results of the Mount Stromlo Abell cluster supernova search, a three-year project to find supernovae (SNe) in a well-defined sample of high-density, southern Abell clusters with redshifts $0.02\leq z \leq0.08$. The search discovered 48 SNe, 23 of which were consistent with SNe of type Ia (SNIa). Of these, 15 were spectroscopically classified SNIa, with the remaining 8 SNe tentatively classified as SNIa via the goodness of fit of the template light curves. This paper describes the methods employed to produce the light curves for the SNe discovered during the Mount Stromlo Abell cluster supernova search. We derive the redshift-independent distances to the SNIa from the search, as well as a large sample of other well-observed SNIa taken from the literature via a modified $\Delta m_{15}$ template light curve fitting technique. This technique and the problems encountered in using it are described in detail. We construct a Hubble diagram for SNIa and show that our data with z<0.2 are consistent with an accelerating universe. Using current Cepheid HST calibrations, we estimate that the value of the Hubble constant lies between 53 < H0 < 83 km -1 s -1 Mpc -1, with the large spread almost entirely due to possible systematic errors in the Cepheid calibration.


Key words: cosmology: observations -- supernovae: general -- surveys

Offprint request: L. M. Germany, lgermany@eso.org

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© ESO 2004


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