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Query : 2001ApJ...549....1G |
2001ApJ...549....1G - Astrophys. J., 549, 1-17 (2001/March-1)
Median statistics, H0, and the accelerating universe.
GOTT III J.R., VOGELEY M.S., PODARIU S. and RATRA B.
Abstract (from CDS):
Applying median statistics to Huchra's compilation of nearly all estimates of the Hubble constant, we find a median value H0=67 km.s–1.Mpc–1. Median statistics assume only that the measurements are independent and free of systematic errors. This estimate is arguably the best summary of current knowledge because it uses all available data and, unlike other estimates, makes no assumption about the distribution of measurement errors. The 95% range of purely statistical errors is ±2 km.s–1.Mpc–1. The high degree of statistical accuracy of this result demonstrates the power of using only these two assumptions and leads us to analyze the range of possible systematic errors in the median, which we estimate to be roughly ±5 km.s–1.Mpc–1 (95% limits), dominating over the statistical errors.
Using a Bayesian median statistics treatment of high-redshift Type Ia supernovae (SNe Ia) apparent magnitude versus redshift data from Riess et al., we find the posterior probability that the cosmological constant Λ>0 is 70% or 89%, depending on the prior information we include. We find the posterior probability of an open universe is about 47%, and the probability of a spatially flat universe is 51% or 38%. Our results generally support the observers' conclusions but indicate weaker evidence for Λ>0 (less than 2 σ). Median statistics analysis of the Perlmutter et al. high-redshift SNe Ia data shows that the best-fit flat-Λ model is favored over the best-fit Λ=0 open model by odds of 366:1; the corresponding Riess et al. odds are 3:1 (assuming in each case prior odds of 1:1).
A scalar field with a potential energy with a ``tail'' behaves like a time-variable Λ. Median statistics analyses of the SNe Ia data do not rule out such a time-variable Λ and may even favor it over a time-independent Λ and a Λ=0 open model.
Abstract Copyright: ∼
Journal keyword(s): Cosmology: Distance Scale - Cosmology: Large-Scale Structure of Universe - Methods: Data Analysis - Methods: Statistical - Planets and Satellites: Individual: Pluto - Stars: Supernovae: General
Simbad objects: 1
Number of rows : 1 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
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1 | NAME LMC | G | 05 23 34.6 | -69 45 22 | 0.4 | ~ | 17459 | 0 |
Query : 2001ApJ...549....1G |
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Identifiers (21) :
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NAME LMC | ESO-LV 56-1150 | 2FHL J0526.6-6825e | NAME Nubecula Major |
Anon 0524-69 | 1FGL J0538.9-6914 | 1FLE J0536-6856 | [M98c] 052400.0-694800 |
2EG J0532-6914 | 2FGL J0526.6-6825e | GLXY G279.0-34.4+262 | [MI94] Sm 29 |
3EG J0533-6916 | 3FGL J0526.6-6825e | IRAS 05240-6948 | |
EGR J0537-6946 | 4FGL J0519.9-6845e | LEDA 17223 | |
ESO 56-115 | 1FHL J0526.6-6825 | NAME Large Magellanic Cloud |
References (17459 between 1850 and 2024) (Total 17459)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system). Follow new references on this object |
Observing logs
Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center
Data at NED - NASA/IPAC Extragalactic Database : NAME LMC
Link by name to the catalogue in VizieR :
3EG J0533-6916 | ESO-LV 56-1150 | IRAS 05240-6948 |
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