EDP Sciences
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Volume 399, Number 2, February IV 2003
Page(s) 441 - 448
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20021800

A&A 399, 441-448 (2003)
DOI: 10.1051/0004-6361:20021800

H0 measurement from VLT deep I-band surface brightness fluctuations in NGC 564 and NGC 7619

S. Mei1, M. Scodeggio2, D. R. Silva3 and P. J. Quinn3

1  Institut d'Astrophysique Spatiale, Université Paris-Sud, Bât. 121, 91405 Orsay, France
2  Istituto di Fisica Cosmica G. Occhialini, Via Bassini 15, 20133 Milano, Italy
3  European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany

(Received 28 June 2002 / Accepted 22 November 2002 )

We have measured the Hubble constant H0 in NGC 564 at $cz \approx 5800$ km s -1 and in NGC 7619 at $cz \approx 3700$ km s -1 with deep I-band Surface Brightness Fluctuation distance measurements at the ESO Very Large Telescope (VLT). We obtain $H_0 =
70 \pm 7 \pm 6$ km s -1/Mpc for NGC 564 and $H_0 = 68 \pm 6 \pm 6$ for NGC 7619. The actual SBF sample used for the measurement of H0 in the Hubble Space Telescope Key Project on the Extragalactic Distance Scale (Freedman et al. 2001) amounts to six galaxies. When we combine the measurements from this work with our previous VLT I-band SBF distance measurement in IC 4296 (Mei et al. 2000), we obtain: H0 = 68 $\pm$ 5 $\pm$ 6 km s -1/Mpc. When we add the Freedman et al. (2001) SBF sample, we obtain $H_0 = 71 \pm 4 \pm 6$ km s -1/Mpc.

Key words: galaxies: distances and redshifts -- cosmology: cosmological parameters

Offprint request: S. Mei, simona.mei@ias.fr

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