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2008MNRAS.390.1762D - Mon. Not. R. Astron. Soc., 390, 1762-1776 (2008/November-2)
The Cepheid distance to the Large Magellanic Cloud and NGC 4258 by the surface brightness technique and improved calibration of the cosmic distance scale.
DI BENEDETTO G.P.
Abstract (from CDS):
The SB technique is also applied to confidently determine the Cepheid distance to the maser host galaxy NGC 4258. Cepheids in the inner region with near solar metallicity yield a true distance modulus of µ_O_(NGC4258) = [29.28±0.03 (random)±0.03 (systematic)] mag, in excellent agreement, at the 0.01 mag level, with the high-weight geometric water maser distance modulus. It is shown that the current data-reduction approach of averaging individual Cepheid distances can introduce significant systematic errors in the distance scale calibration. From a small sample of Hubble Space Telescope (HST) based galaxies, I derive an overall error of (12 ± 5) per cent, which would suggest a downward revision of the Freedman et al. Hubble constant to the value H0= (63±7)km/s/Mpc, other things being equal.
Abstract Copyright: © 2008 The Author. Journal compilation © 2008 RAS
Journal keyword(s): Cepheids - Magellanic Clouds - distance scale
Simbad objects: 51
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