AAS 199th meeting, Washington, DC, January 2002
Session 16. Cosmology and Lensing
Display, Monday, January 7, 2002, 9:20am-6:30pm, Exhibit Hall

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[16.07] \OmegaM and \Omega\Lambda from 11 HST-Observed Supernovae at z=0.36--0.86

R.A. Knop (Vanderbilt), G. Aldering (LBNL), R. Amanullah (Stockholm), P. Antilogus (IPN Lyon), P. Astier (LPNHE), C. Balland (IAS Orsay), G. Blanc (LBNL), M.S. Burns (Colorado Col.), A. Conley, S. Deustua (LBNL), R. Ellis (Caltech), S. Fabbro (IPN Lyon), G. Folatelli (Stockholm), A. Fruchter (STScI), G. Garavini (Stockholm), R. Gibbons, G. Goldhaber (LBNL), A. Goobar (Stockholm), D.E. Groom (LBNL), D. Hardin (LPNHE), I.M. Hook (Oxford), D.A. Howell (LBNL), M. Irwin (IoA Cambridge), D. Kasen, A. Kim (LBNL), J.-M. Levy (LPNHE), C. Lidman (ESO), R. McMahon (IoA Cambridge), M. Mouchet (DAEC Meudon), S. Nobili (Stockholm), P. Nugent (LBNL), R. Pain (LPNHE), N. Panagia (STScI), E. Pécontal (CRA Lyon), C.R. Pennypacker, S. Perlmutter, R. Quimby (LBNL), J. Raux (LPNHE), N. Regnault (LBNL), P. Ruiz-Lapuente (Barcelona), B. Schaefer (Texas), K. Schahmaneche (LPNHE), A.L. Spadafora (LBNL), N. Walton (ING LaPalma), L. Wang, W.M. Wood-Vasey (LBNL), Supernova Cosmology Project Collaboration

The Supernova Cosmology Project has previously presented data from 42 Type~Ia supernovae which set limits on the cosmological mass density \OmegaM and provided evidence for a cosmological constant \Omega\Lambda, implying that the expansion of the universe is currently accelerating. This poster will present the results from an additional 11 Type~Ia supernovae discovered in 1998--2000, observed with the Wide Field/Planetary Camera 2 (WFPC2) on the Hubble Space Telescope (HST) in the F675W (R) and F814W (I) filters. The WFPC2 observations of these supernovae provide much better photometric constraints on the lightcurves of the supernovae, yielding in turn a better measurement of the distance modulus to each supernova, particularly at higher redshifts, than was available for the 42 supernovae previously observed from the ground. These new observations improve our measurements of the cosmological parameters \OmegaM and \Omega\Lambda.

This work was supported by the Department of Energy and by the NASA Space Telescope Science Institute.

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