BTA optical velocities confirm 12 new Local Volume companions (including satellites of DDO 46, NGC 2903, NGC 4826) and yield NGC 1068 group mass (2.6 ± 1.0) × 10^12 M⊙.
Draining the Local Void
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abstract
Two galaxies that lie deep within the Local Void provide a test of the expectation that voids expand. The modest (M_B~-14) HI bearing dwarf galaxies ALFAZOAJ1952+1428 and KK246 have been imaged with Hubble Space Telescope in order to study the stellar populations and determine distances from the luminosities of stars at the tip of the red giant branch. The mixed age systems have respective distances of 8.39 Mpc and 6.95 Mpc and inferred line-of-sight peculiar velocities of -114 km/s and -66 km/s toward us and away from the void center. These motions compound on the Milky Way motion of ~230 km/s away from the void. The orbits of the two galaxies are reasonably constrained by a numerical action model encompassing an extensive region that embraces the Local Void. It is unambiguously confirmed that these two void galaxies are moving away from the void center at several hundred km/s.
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New optical velocities for local galaxy candidates
BTA optical velocities confirm 12 new Local Volume companions (including satellites of DDO 46, NGC 2903, NGC 4826) and yield NGC 1068 group mass (2.6 ± 1.0) × 10^12 M⊙.