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1999ApJ...527..479S - Astrophys. J., 527, 479-487 (1999/December-3)
Bias properties of extragalactic distance indicators. VIII. H0 from distance-limited luminosity class and morphological type-specific luminosity functions for sb, sbc, and sc galaxies calibrated using cepheids.
SANDAGE A.
Abstract (from CDS):
Absolute calibration of the trial kinematic absolute magnitudes is made using 27 galaxies with known T and L that also have Cepheid distances. This permits the systematic correction to the H0=50 kinematic absolute magnitudes of 0.22±0.12 mag, giving
H0=55±3(internal) km.s–1.Mpc–1.
The Cepheid distances are based on the Madore/Freedman Cepheid period-luminosity (PL) zero point that requires (m-M)0=18.50 for the LMC. Using the modern LMC modulus of (m-M)0=18.58 requires a 4% decrease in H0, giving a final value of H0=53±7 (external) by this method. These values of H0, based here on the method of luminosity functions, are in good agreement with (1) H0=55±5 by Theureau and coworkers from their bias-corrected Tully-Fisher method of ``normalized distances'' for field galaxies; (2) H0=56±4 from the method through the Virgo Cluster, as corrected to the global kinematic frame (Tammann and coworkers); and (3) H0=58±5 from Cepheid-calibrated Type Ia supernovae (Saha and coworkers). Our value here also disagrees with the final value from the NASA ``Key Project'' group value of H0=70±7.
Analysis of the total flux-limited sample of Sb, Sbc, and Sc galaxies in the RSA2 by the present method, but uncorrected for selection bias, would give an incorrect value of H0=71 using the same Cepheid calibration. The effect of the bias is pernicious at the 30% level; either it must be corrected by the methods in the papers of this series, or the data must be restricted to the distance-limited subset of any sample, as is done here.
Abstract Copyright: ∼
Journal keyword(s): Stars: Variables: Cepheids - Cosmology: Observations - Cosmology: Distance Scale - Galaxies: Luminosity Function, Mass Function - Galaxies: Spiral
Simbad objects: 29
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