Distances to Nearby Galaxies in Sculptor

A. E. Dolphin; A. Sarajedini; D. Geisler; E. K. Grebel; I. D. Karachentsev; M. E. Sharina; P. Guhathakurta; P. Seitzer; P.W. Hodge; V. E. Karachentseva

Distances to Nearby Galaxies in Sculptor

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arxiv astro-ph/0302045 v1 pith:7UAWFTWO submitted 2003-02-04 astro-ph

I. D. Karachentsev , E. K. Grebel , M. E. Sharina , A. E. Dolphin , D. Geisler , P. Guhathakurta , P.W. Hodge , V. E. Karachentseva

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A. Sarajedini P. Seitzer

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keywords distancesgalaxiessculptorhubblenearbyngc253ngc7793accuracy

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We present an analysis of Hubble Space Telescope/WFPC2 images of nine nearby galaxies in Sculptor. We derive their distances from the luminosity of the tip of the red giant branch stars with a typical accuracy of ~ 12%. Their distances are 4.21 Mpc (Sc22), 4.92 Mpc (DDO226), 3.94 Mpc (NGC253), 3.40 Mpc (KDG2), 3.34 Mpc (DDO6), 3.42 Mpc (ESO540-030), 4.43 Mpc (ESO245-05), 4.27 Mpc (UGCA442), and 3.91 Mpc (NGC7793). The galaxies are concentrated in several spatially separated loose groups around NGC300, NGC253, and NGC7793. The Sculptor galaxy complex together with the CVn I cloud and the Local Group form a 10 Mpc amorphous filament, apparently driven by the free Hubble flow.

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