Volume 430, Number 3, February II 2005
|Page(s)||843 - 851|
|Section||Cosmology (including clusters of galaxies)|
|Published online||26 January 2005|
Spectroscopic confirmation of high-redshift supernovae with the ESO VLT *,**
European Southern Observatory, Chile e-mail: firstname.lastname@example.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
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 to . 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 were targeted, over 80% of the observed candidates were spectrally classified as SNe Ia. In those searches in which SNe Ia with were targeted, 4 candidates with 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
Based on observations obtained at the European Southern Observatory using the ESO Very Large Telescope on Cerro Paranal (ESO programs 265.A-5721(A), 67.A-0361(A), 267.A-5688(A), 169.A-0382(A) and (B)). Based in part on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Based in part on data collected from the Canada-France-Hawaii Telescope Corporation, which is operated by the National Research Council of Canada, le Centre National de la Recherche Scientifique de France, and the University of Hawaii. Based in part on data collected at the Cerro Tololo Inter-American Observatory, which is operated by Association of Universities for Research in Astronomy, Inc. under a cooperative agreement with the National Science Foundation.
© ESO, 2005
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