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• W2016898178 abstract "As part of an ongoing search for dwarf elliptical galaxies (dE's) in the vicinity of the Local Group (Jerjen et al.), we acquired deep B- and R-band images for five dE candidates identified on morphological criteria in the Sculptor (Scl) group region. We carried out a surface brightness fluctuation (SBF) analysis on the R-band images to measure the apparent fluctuation magnitude R for each dE. Using predictions from stellar population synthesis models (Worthey) giving R values in the narrow range between -1.17 and -1.13, the galaxy distances were determined. All of these dE candidates turned out to be satellites of Scl group major members. A redshift measurement of the dE candidate ESO 294-010 yielded an independent confirmation of its group membership: the [O III] and Hα emission lines from a small H II region gave a heliocentric velocity of 117 (±5) km s-1, in close agreement with the velocity of its parent galaxy NGC 55 (v⊙ = 125 km s-1). The precision of the SBF distances (5%–10%) contributes to delineating the cigar-like distribution of the Scl group members, which extend over distances from 1.7 to 4.4 Mpc and are concentrated in three, possibly four subclumps. The Hubble diagram for nine Scl galaxies, including two of our dE's, exhibits a tight linear velocity-distance relation with a steep slope of 119 km s-1 Mpc-1. The results indicate that gravitational interaction among the Scl group members plays only a minor role in the dynamics of the group. However, the Hubble flow of the entire system appears strongly disturbed by the large masses of our Galaxy and M31, which leads to the observed shearing motion. From the distances and velocities of 49 galaxies located in the Local Group and toward the Scl group, we illustrate the continuity of the galaxy distribution, which strongly supports the view that the two groups form a single supergalactic structure." @default.
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• W2016898178 date "1998-12-01" @default.
• W2016898178 modified "2023-10-03" @default.
• W2016898178 title "Surface Brightness Fluctuation Distances to Dwarf Elliptical Galaxies in the Sculptor Group" @default.
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• W2016898178 doi "https://doi.org/10.1086/300635" @default.
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