期刊
ASTROPHYSICAL JOURNAL
卷 938, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac8e04
关键词
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资金
- John Templeton Foundation [62314]
- NASA through NASA Hubble Fellowship - Space Telescope Science Institute (STScI) [HST-HF2-51430.001]
- NASA [NAS5-26555, NNG17PX03C]
- DOE [DE-SC0010007]
- David and Lucile Packard Foundation
- Marc J. Staley, whose fellowship
- TABASGO Foundation
- Christopher R. Redlich Fund
- U.C. Berkeley Miller Institute for Basic Research in Science
- STFC Ernest Rutherford Fellowship [ST/T005009/1]
- UKRI Future Leaders Fellowship [MR/T01881X/1]
This study presents constraints on cosmological parameters based on 1701 light curves of 1550 distinct Type Ia supernovae. By increasing the sample size, improving systematic uncertainty treatments, and adding cross-calibrated photometric systems, the cosmological constraining power has been significantly improved. The results indicate a consistent cosmological constant and provide precise measurements on the evolution of dark energy.
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z = 0.001 to 2.26. This work features an increased sample size from the addition of multiple cross-calibrated photometric systems of SNe covering an increased redshift span, and improved treatments of systematic uncertainties in comparison to the original Pantheon analysis, which together result in a factor of 2 improvement in cosmological constraining power. For a flat ACDM model, we find Omega(M) = 0.334 +/- 0.018 from SNe Ia alone. For a flat w(0)CDM model, we measure w(0) = -0.90 +/- 0.14 from SNe Ia alone, H-0 = 73.5 +/- 1.1 km s(-1) Mpc(-1 )when including the Cepheid host distances and covariance (SHOES), and w(0) = -0.978(-0.031)(+0.024) when combining the SN likelihood with Planck constraints from the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO); both w(0) values are consistent with a cosmological constant. We also present the most precise measurements to date on the evolution of dark energy in a flat w(0)w(a)CDM universe, and measure w(a) = -0.1(-2.0)(+0.9) from Pantheon+ SNe Ia alone, H-0 = 73.3 +/- 1.1 km s(-1) Mpc(-1) when including SHOES Cepheid distances, and w(a) = -0.65(-0.32)(+0.28) when combining Pantheon+ SNe Ia with CMB and BAO data. Finally, we find that systematic uncertainties in the use of SNe Ia along the distance ladder comprise less than one-third of the total uncertainty in the measurement of H-0 and cannot explain the present Hubble tension between local measurements and early universe predictions from the cosmological model.
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