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Subaru FOCAS Spectroscopic Observations of High-Redshift Supernovae
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2010 (English)In: Nippon Tenmon Gakkai obun kenkyu hokoku, ISSN 0004-6264, Vol. 62, no 1, 19-37 p.Article in journal (Refereed) Published
Abstract [en]

We present spectra of high-redshift supernovae (SNe) that were taken with the Subaru low-resolution optical spectrograph, FOCAS. These SNe were found in SN surveys with Suprime-Cam on Subaru, the CFH12k camera on the Canada-France-Hawaii Telescope, and the Advanced Camera for Surveys on the Hubble Space Telescope. These SN surveys specifically targeted z > 1 Type la supernovae (SNe Ia). From the spectra of 39 candidates, we obtained redshifts for 32 candidates and spectroscopically identified 7 active candidates as probable SNe Ia, including one at z = 1.35, which is the most distant SN la to be spectroscopically confirmed with a ground-based telescope. An additional 4 candidates were identified as likely SNe la from the spectrophotometric properties of their host galaxies. Seven candidates are not SNe la, either being SNe of another type or active galactic nuclei. When SNe la were observed within one week of the maximum light, we found that we could spectroscopically identify most of them up to z = 1.1. Beyond this redshift, very few candidates were spectroscopically identified as SNe Ia. The current generation of super red-sensitive, fringe-free CCDs will push this redshift limit higher.

Place, publisher, year, edition, pages
2010. Vol. 62, no 1, 19-37 p.
Keyword [en]
cosmology: observations, stars: supernovae: general, surveys
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-48919ISI: 000276721100005OAI: oai:DiVA.org:su-48919DiVA: diva2:376308
Note
authorCount :33Available from: 2010-12-10 Created: 2010-12-10 Last updated: 2017-12-11Bibliographically approved

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Lidman, ChristopherAmanullah, RahmanGoobar, Ariel
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