Authors

C. Lidman, European Southern Observatory Santiago
D. A. Howell, Lawrence Berkeley National Laboratory
G. Folatelli, Stockholms universitet
G. Garavini, Stockholms universitet
S. Nobili, Stockholms universitet
G. Aldering, Lawrence Berkeley National Laboratory
R. Amanullah, Stockholms universitet
P. Antilogus, Laboratoire de Physique Nucléaire et de Hautes Energies
P. Astier, Laboratoire de Physique Nucléaire et de Hautes Energies
G. Blanc, Lawrence Berkeley National Laboratory
M. S. Burns, Colorado College
A. Conley, Lawrence Berkeley National Laboratory
S. E. Deustua, American Astronomical Society
M. Doi, The University of Tokyo
R. Ellis, California Institute of Technology
S. Fabbro, Instituto Superior Técnico
V. Fadeyev, Lawrence Berkeley National Laboratory
R. Gibbons, Lawrence Berkeley National Laboratory
G. Goldhaber, Lawrence Berkeley National Laboratory
A. Goobar, Stockholms universitet
D. E. Groom, Lawrence Berkeley National Laboratory
I. Hook, University of Oxford
N. Kashikawa, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
A. G. Kim, Lawrence Berkeley National Laboratory
R. A. Knop, Vanderbilt University
B. C. Lee, Lawrence Berkeley National Laboratory
J. Mendez, Isaac Newton Group
T. Morokuma, The University of Tokyo
K. Motohara, The University of Tokyo
P. E. Nugent, Lawrence Berkeley National Laboratory
R. Pain, Laboratoire de Physique Nucléaire et de Hautes Energies
S. Perlmutter, Lawrence Berkeley National Laboratory
V. Prasad, Lawrence Berkeley National Laboratory

Document Type

Article

Publication Date

2-1-2005

Abstract

We present VLT FORS1 and FORS2 spectra of 39 candidate high-redshift supernovae that were discovered as part of a cosmological study using type la supernovae (SNe la) over a wide range of redshifts. From the spectra alone, 20 candidates are spectrally classified as SNe Ia with redshifts ranging from z = 0.212 to z = 1.181. Of the remaining 19 candidates, 1 might be a type II supernova and 11 exhibit broad supernova-like spectral features and/or have supernova-like light curves. The candidates were discovered in 8 separate ground-based searches. In those searches in which SNe la at z ∼0.5 were targeted, over 80% of the observed candidates were spectrally classified as SNe Ia. In those searches in which SNe la with z > 1 were targeted, 4 candidates with z > 1 were spectrally classified as SNe la and later followed with ground and space based observatories. We present the spectra of all candidates, including those that could not be spectrally classified as supernova.

Publication Source (Journal or Book title)

Astronomy and Astrophysics

First Page

843

Last Page

851

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