Type IIn supernovae at redshift z ≈ 2 from archival data

Jeff Cooke (), Mark Sullivan, Elizabeth J. Barton, James S. Bullock, Ray G. Carlberg, Avishay Gal-Yam and Erik Tollerud
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Jeff Cooke: Center for Cosmology, University of California, Irvine, California 92697-4574, USA
Mark Sullivan: University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
Elizabeth J. Barton: Center for Cosmology, University of California, Irvine, California 92697-4574, USA
James S. Bullock: Center for Cosmology, University of California, Irvine, California 92697-4574, USA
Ray G. Carlberg: University of Toronto, Toronto, Ontario M5S 3H4, Canada
Avishay Gal-Yam: Benoziyo Center for Astrophysics, Weizmann Institute of Science
Erik Tollerud: Center for Cosmology, University of California, Irvine, California 92697-4574, USA

Nature, 2009, vol. 460, issue 7252, 237-239

Abstract: Two supernovae at z > 2 Supernovae provide valuable opportunities to study galactic processes from the local Universe to large distances, but their properties and the sensitivities of current telescopes make the detection of high-redshift examples extremely difficult. Previous searches have revealed core-collapse (type II) supernovae to z ≈ 0.7 and thermonuclear (type Ia) to z ≈1.5. Now by exploiting the exceptional properties of sub-class type IIn core-collapse supernovae — including extreme brightness in the ultraviolet and bright, long-lived emission lines — Cooke et al. report the discovery in archival data of three previously unknown supernovae at redshifts z = 0.808, 2.013 and 2.357. The study of objects with redshifts z > 2 provides a window on the Universe at a time shortly after the formation of the first stars.

Date: 2009
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DOI: 10.1038/nature08082

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