Papers › Clustering of Local Group distances: publication bias or correlated measurements? VII....
Clustering of Local Group distances: publication bias or correlated measurements? VII. A distance framework out to 100 Mpc
Richard de Grijs, Giuseppe Bono
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We consider the published distance moduli to the Fornax and Coma galaxy clusters, with emphasis on the period since 1990. We have carefully homogenized our catalogs of distance moduli onto the distance scale established in the previous papers in this series. We assessed systematic differences associated with the use of specific tracers, and discarded results based on application of the Tully--Fisher relation and of globular cluster and planetary nebula luminosity functions. We recommend `best' weighted relative distance moduli for the Fornax and Coma clusters with respect to the Virgo cluster of Δ(m-M)₀^(Fornax - Virgo) = 0.18 ±0.28 mag and Δ(m-M)₀^(Coma - Virgo) = 3.75 ±0.23 mag. The set of weighted mean distance moduli (distances) we derived as most representative of the clusters' distances is, (m-M)₀^(Fornax) = 31.41 ±0.15 (D = 19.1^(+1.4)_(-1.2) = 31.21 ±0.28 (D = 17.5^(+2.4)_(-2.2) ; (m-M)₀^(Coma) = 34.99 ±0.38 (D = 99.5^(+19.0)_(-15.9) = 34.78 ±0.27 (D = 90.4^(+11.9)_(-10.6) , where the first value for each cluster is the result of our analysis of the direct distance moduli, while the second modulus is based on distance moduli relative to the Virgo cluster. The absolute and relative distance moduli for both clusters are mutually consistent within the uncertainties; the relative distance moduli yield shorter distances by ∼1σ. Lingering uncertainties in the underlying absolute distance scale appear to have given rise to a systematic uncertainty on the order of 0.20 mag.
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