Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets
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Abstract
We present a new compilation of Type Ia supernovae (SNe Ia), a new dataset of low-redshift nearby-Hubble-flow SNe and new analysis procedures to work with these heterogeneous compilations. This “Union ” compilation of 414 SN Ia, which reduces to 307 SNe after selection cuts, includes the recent large samples of SNe Ia from the Supernova Legacy Survey and 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, and a new procedure is implemented that consistently weights the heterogeneous data sets and rejects outliers. We present the latest results from this Union compilation and discuss the cosmological constraints from this new compilation and its combination with other cosmological measurements (CMB and BAO). The constraint we obtain from supernovae on the dark energy density is ΩΛ = 0.713 +0.027
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The record
- Venue
- The Astrophysical Journal
- Topic
- Gamma-ray bursts and supernovae
- Field
- Physics and Astronomy
- Canadian institutions
- University of Toronto
- Funders
- Nuclear PhysicsScience and Technology Facilities CouncilOffice of ScienceFundação para a Ciência e a TecnologiaU.S. Department of EnergyUniversity of ArizonaDeutsche ForschungsgemeinschaftYale University
- Keywords
- PhysicsCosmic microwave backgroundDark energySupernovaRedshiftAstrophysicsHubble's lawCosmological constantEquation of stateCosmologyTheoretical physicsGalaxy
- Has abstract in OpenAlex
- yes