AAS 205th Meeting, 9-13 January 2005
Session 69 Cosmology: Population III, Distant SNe, and Dark Energy
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[69.03] Cosmological Constraints from the First Supernova Discovered above Redshift of One.

V. Fadeyev, G. Aldering (LBNL), R. Amanullah (Stockholm), P. Astier (LPNHE Paris), M. S. Burns (Colorado Col.), A. Conley (LBNL), R. Ellis (Caltech), S. Fabbro (Lisbon), G. Folatelli (Stockholm), A. S. Fruchter (STScI), G. Garavini (Stockholm), R. Gibbons (Vanderbilt), G. Goldhaber (LBNL), A. Goobar (Stockholm), D. E. Groom (LBNL), I. Hook (Oxford), D. A. Howell (Toronto), A. G. Kim (LBNL), R. A. Knop (Vanderbilt), M. Kowalski (LBNL), C. Lidman (ESO), J. Mendez (ING), S. Nobili (Stockholm), P. E. Nugent (LBNL), R. Pain (LPNHE Paris), N. Panagia (STScI), S. Perlmutter (LBNL), J. Raux (LPNHE Paris), P. Ruiz-Lapuente (Barcelona), G. Sainton (LPNHE Paris), B. E. Schaefer (LSU), E. Smith (Vanderbilt), A. L. Spadafora (LBNL), V. Stanishev (Stockholm), R. C. Thomas (LBNL), N. A. Walton (IoA Cambridge), L. Wang, W. M. Wood-Vasey (LBNL), Supernova Cosmology Project Collaboration

SN~1998eq at redshift 1.20 was discovered in a dedicated search with the Keck 10-m telescope, and followed with HST WFPC2 and NICMOS imaging. It was the first discovery of a spectroscopically-confirmed supernova which exploded far into the epoch of deceleration when the effects of a cosmological constant were negligible, and set the stage for subsequent supernova searches beyond redshift 1. We report on the photometry for SN~1998eq, which includes a treatment of the very significant host-galaxy contamination, and the resulting lightcurve fit. The SN colors indicate a low extinction, but the uncertainty calculation is complicated due to overlap of the HST and Keck I-band filters with the NICMOS J-band filter. We attempt to use the well-measured SN spectrum as an additional input to the the extinction measurement. The spectrum is also used to improve the uncertainties arising from K-corrections in the restframe UV. The cosmological constraints from SN~1998eq are reported, including a statistical treatment of gravitational lensing.

This work was supported in part by the Director, Office of Science, Office of High Energy and Nuclear Physics, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.

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© 2004. The American Astronomical Society.