Twenty-three high-redshift supernovae from the institute for astronomy deep survey: Doubling the supernova sample at Z > 0.71,2

Brian J. Barris*, John L. Tonry, Stéphane Blondin, Peter Challis, Ryan Chornock, Alejandro Clocchiatti, Alexei V. Filippenko, Peter Garnavich, Stephen T. Holland, Saurabh Jha, Robert P. Kirshner, Kevin Krisciunas, Bruno Leibundgut, Weidong Li, Thomas Matheson, Gajus Miknaitis, Adam G. Riess, Brian P. Schmidt, R. Chris Smith, Jesper SollermanJason Spyromilio, Christopher W. Stubbs, Nicholas B. Suntzeff, Hervé Aussel, K. C. Chambers, M. S. Connelley, D. Donovan, J. Patrick Henry, Nick Kaiser, Michael C. Liu, Eduardo L. Martín, Richard J. Wainscoat

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

401 Scopus citations


We present photometric and spectroscopic observations of 23 high-redshift supernovae (SNe) spanning a range of z = 0.34-1.03, nine of which are unambiguously classified as Type la. These SNe were discovered during the IfA Deep Survey, which began in 2001 September and observed a total of 2.5 deg 2 to a depth of approximately m ≈ 25-26 in RIZ over 9-17 visits, typically every 1-3 weeks for nearly 5 months, with additional observations continuing until 2002 April. We give a brief description of the survey motivations, observational strategy, and reduction process. This sample of 23 high-redshift SNe includes 15 at z ≥ 0.7, doubling the published number of objects at these redshifts, and indicates that the evidence for acceleration of the universe is not due to a systematic effect proportional to redshift. In combination with the recent compilation of Tonry et al. (2003), we calculate cosmological parameter density contours that are consistent with the flat universe indicated by the cosmic microwave background (Spergel et al. 2003). Adopting the constraint that ωtotal = 1.0, we obtain best-fit values of (ωm, ω) = (0.33, 0.67) using 22 SNe from this survey augmented by the literature compilation. We show that using the empty-beam model for gravitational lensing does not eliminate the need for ωλ > 0. Experience from this survey indicates great potential for similar large-scale surveys while also revealing the limitations of performing surveys for z > 1 SNe from the ground.

Original languageEnglish (US)
Pages (from-to)571-594
Number of pages24
JournalAstrophysical Journal
Issue number2 I
StatePublished - Feb 20 2004


  • Cosmological parameters
  • Distance scale
  • Galaxies: distances and redshifts
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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