EDP Sciences
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Volume 430, Number 3, February II 2005
Page(s) 843 - 851
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20041504

A&A 430, 843-851 (2005)
DOI: 10.1051/0004-6361:20041504

Spectroscopic confirmation of high-redshift supernovae with the ESO VLT

C. Lidman1, D. A. Howell2, 3, G. Folatelli4, G. Garavini4, 5, S. Nobili4, 5, G. Aldering2, R. Amanullah4, P. Antilogus5, P. Astier5, G. Blanc2, 6, M. S. Burns7, A. Conley2, 8, S. E. Deustua9, M. Doi10, R. Ellis11, S. Fabbro12, V. Fadeyev2, R. Gibbons2, G. Goldhaber2, 8, A. Goobar4, D. E. Groom2, I. Hook13, N. Kashikawa14, A. G. Kim2, R. A. Knop15, B. C. Lee2, J. Mendez16, 17, T. Morokuma10, K. Motohara10, P. E. Nugent2, R. Pain5, S. Perlmutter2, 8, V. Prasad2, R. Quimby2, J. Raux5, N. Regnault2, 5, P. Ruiz-Lapuente17, G. Sainton5, B. E. Schaefer18, K. Schahmaneche5, E. Smith15, A. L. Spadafora2, V. Stanishev4, N. A. Walton19, L. Wang2, W. M. Wood-Vasey2, 8 and N. Yasuda (The Supernova Cosmology Project)20

1  European Southern Observatory, Chile
    e-mail: clidman@eso.org
2  E. O. Lawrence Berkeley National Laboratory
3  Department of Astronomy and Astrophysics, University of Toronto
4  Department of Physics, Stockholm University
5  LPNHE, CNRS-IN2P3, University of Paris VI & VII, Paris, France
6  Osservatorio Astronomico di Padova, Italy
7  Colorado College
8  Department of Physics, University of California Berkeley, Berkeley
9  American Astronomical Society
10  Institute of Astronomy, School of Science, University of Tokyo
11  California Institute of Technology
12  CENTRA-Centro M. de Astrofísica and Department of Physics, IST, Lisbon, Portugal
13  Department of Physics, University of Oxford, Nuclear & Astrophysics Laboratory
14  National Astronomical Observatory, Mitaka, Tokyo 181-0058, Japan
15  Department of Physics and Astronomy, Vanderbilt University
16  Isaac Newton Group, La Palma, Spain
17  Department of Astronomy, University of Barcelona
18  Louisiana State University, Department of Physics and Astronomy
19  Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
20  Institute for Cosmic Ray Research, University of Tokyo

(Received 22 June 2004 / Accepted 4 October 2004 )

We present VLT FORS1 and FORS2 spectra of 39 candidate high-redshift supernovae that were discovered as part of a cosmological study using type Ia supernovae (SNe Ia) 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 Ia at $z \sim 0.5$ were targeted, over 80% of the observed candidates were spectrally classified as SNe Ia. In those searches in which SNe Ia with z > 1 were targeted, 4 candidates with z > 1 were spectrally classified as SNe Ia 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.

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

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© ESO 2005

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