Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5507r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #55.07; Bulletin of the American Astronomical Society, Vol. 39, p.826
Mathematics
Logic
Scientific paper
The present uncertainty in the value of the Hubble constant (resulting in an uncertainty in OmegaM) and the paucity of Type Ia supernovae at redshifts exceeding 1 are leading obstacles to determining the nature of dark energy. We conducted a single, integrated set of observations in Cycle 15 to provide a 40% improvement in constraints on dark energy. This program observed known Cepheids in six reliable hosts of Type Ia supernovae with NICMOS, to reduce the uncertainty in H0 by a factor of two because of the smaller dispersion along the instability strip, the diminished extinction, and the weaker metallicity dependence in the infrared. In parallel with ACS, at the same time the NICMOS observations were underway, we discovered and followed a sample of Type Ia supernovae at z > 1. Together, these measurements, along with prior constraints from WMAP, should provide a significant improvement in our ability to distinguish between a static, cosmological constant and dynamical dark energy.
Macri Lucas
Riess Adam G.
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