Median Statistics Estimate of the Distance to M87
arXiv:2309.10870 · doi:10.1088/1538-3873/ad220e
Abstract
de Grijs and Bono compiled 211 independent measurements of the distance to galaxy M87 in the Virgo cluster from 15 different tracers and reported the arithmetic mean of a subset of this compilation as the best estimate of the distance. We compute three different central estimates -- the arithmetic mean, weighted mean, and the median -- and corresponding statistical uncertainty for the full data set as well as two sub-compilations. We find that for all three central estimates the error distributions show that the data sets are significantly non-Gaussian. As a result, we conclude that that the median is the most reliable of the three central estimates, as median statistics does not assume Gaussianity. We use median statistics to determine the systematic error on the distance by analyzing the scatter in the 15 tracer subgroup distances. From the 211 distance measurements, we recommend a summary M87 distance modulus of (statistical) (systematic) mag, or combining the two errors in quadrature mag, rounded to Mpc, all at significance.
arXiv comment7 Pages, 2 Tables, Accepted in PASP (PASP-101639.R1)
References in corpus (25)
- Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
- Median Statistics, H_0, and the Accelerating Universe
- Clustering of Local Group distances: publication bias or correlated measurements? I. The Large Magellanic Cloud
- Median statistics and the Hubble constant
- Non-Gaussian Error Distribution of Hubble Constant Measurements
- Binned Cosmic Microwave Background Anisotropy Power Spectra: Peak Location
- The impact of a new median statistics prior on the evidence for dark radiation
- Clustering of Local Group distances: publication bias or correlated measurements? IV. The Galactic Center
- Median Statistics and the Mass Density of the Universe
- Not Normal: the uncertainties of scientific measurements
- Median Statistics Estimate of the Distance to the Galactic Center
- A New Estimate of the Best Value for the Solar Galactocentric Distance
- Median statistics estimates of Hubble and Newton's Constant
- Clustering of Local Group distances: publication bias or correlated measurements? V. Galactic rotation constants
- Non-Gaussian Error Distributions of LMC Distance Moduli Measurements
- Median statistics cosmological parameter values
- Non-Gaussian Error Distribution of Abundance Measurements
- Median Statistics Analysis of Deuterium Abundance Measurements and Spatial Curvature Constraints
- Median Statistics Estimate of the Galactic Rotational Velocity
- MFV approach to robust estimate of neutron lifetime
- A meta-analysis of neutron lifetime measurements
- Non-Gaussian Error Distributions of Galactic Rotation Speed Measurements
- Clustering of Local Group distances: publication bias or correlated measurements? VI. Extending to Virgo cluster distances
- Gaussian Processes, Median Statistics, Milky Way Rotation Curves
- A meta-analysis of distance measurements to M87