Cosmological Constraints from the Union Supernova Compilation

Details Cosmological Constraints from the Union Supernova Compilation Cosmological Constraints from the Union Supernova Compilation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114305r&link_type=abstract

American Astronomical Society, AAS Meeting #211, #143.05; Bulletin of the American Astronomical Society, Vol. 39, p.996

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We present the results of an analysis of the world SNe data, complemented by a new dataset of low-redshift nearby-Hubble-flow SN Ia. This "Union" compilation of nearly 400 SN Ia includes the recent large samples of SNe Ia from the Supernova Legacy Survey and the ESSENCE Survey, the older datasets, as well as the recently extended dataset of distant supernovae observed with HST. A single, consistent and blind analysis procedure is used for all the various SN Ia subsamples. We present the latest results from this Union compilation and its combination with other cosmological measurements (CMB and BAO), and discuss the cosmological constraints on the dark energy density. With the addition of our new nearby Hubble-flow SNe Ia, these resulting cosmological constraints are currently the tightest available. While our results are consistent with a cosmological constant, we obtain only relatively weak constraints on an equation of state, w, that varies with redshift. In particular, the current data do not yet significantly constrain w at z > 1.
This work has been supported by the Office of Science, U.S. Department of Energy, through contract DE-AC02-05CH11231.

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