We use Type Ia supernovae studied by the High-Z Supernova Search Team to constrain the properties of an energy component which may have contributed to accelerating the cosmic expansion. We find that for a flat geometry the equation of state parameter for the unknown component, alpha_x=P_x/rho_x, must be less than -0.55 (95% confidence) for any value of Omega_m and is further limited to alpha_x
P. Garnavich, Saurabh W. Jha, Peter Challis, A. Clocchiatti, Alan H. Diercks, Alexei V Filippenko, Ron Gilliland, Craig J. Hogan, R. Kirshner, B. Leibundgut, M. M. Phillips, David J. Reiss, Adam G. Riess, B. Schmidt, R. A. Schommer, R. Chris Smith, J. Spyromilio, C. W. Stubbs, N. B. Suntzeff, J. Tonry, Sean M. Carroll
B. Schmidt, N. B. Suntzeff, M. M. Phillips, R. A. Schommer, A. Clocchiatti, R. Kirshner, P. Garnavich, P. Challis, B. Leibundgut, J. Spyromilio, Adam G. Riess, Alexei V Filippenko, M. Hamuy, R. Chris Smith, Craig J. Hogan, C. W. Stubbs, Alan H. Diercks, David J. Reiss, Ron Gilliland, J. Tonry, J. Maza, Alan Dressler, J. R. Walsh,
Adam G. Riess, L. Strolger, J. Tonry, Stefano Casertano, Henry C. Ferguson, Bahram Mobasher, Peter Challis, Alexei V Filippenko, Saurabh W. Jha, Weidong Li, R. Chornock, R. Kirshner, B. Leibundgut, Mark Dickinson, Mario Livio, Mauro Giavalisco, Charles C. Steidel, N. Benı́tez, Z. Tsvetanov
J. Tonry, B. Schmidt, B. Barris, P. Candia, Peter Challis, A. Clocchiatti, Alison L. Coil, Alexei V Filippenko, P. Garnavich, Craig J. Hogan, S. T. Holland, Saurabh W. Jha, R. Kirshner, K. Krisciunas, B. Leibundgut, Weidong Li, T. Matheson, M. M. Phillips, Adam G. Riess, R. A. Schommer, R. Chris Smith, J. Sollerman, J. Spyromilio, C. W. Stubbs, N. B. Suntzeff
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