Pecular velocities of galaxies in the Leo Spur
  Hubble Space Telescope Advanced Camera for Surveys has been used to determine
accurate distances for the spiral galaxy NGC2683 and 12 other galaxies in a
zone of the "local velocity anomaly" from measurements of the luminosities of
the brightest red giant branch stars. These galaxies lie in the Leo Spur, the
nearest filament beyond our home Local Sheet. The new, accurate distance
measurements confirm that galaxies along the Leo Spur are more distant than
expected from uniform cosmic expansion, hence have large peculiar velocities
toward us. The motions are generally explained by a previously published model
that posits that the Local Sheet is descending at 259 km/s toward the south
supergalactic pole due to expansion of the Local Void and being attracted at
185 km/s toward the Virgo Cluster. With the standard $\Lambda$CDM cosmology an
empty void expands at 16 km/s/Mpc so a motion of 259 km/s requires the Local
Void to be impressively large and empty. Small residuals from the published
model can be attributed to an upward push toward the north supergalactic pole
by expansion of the Gemini-Leo Void below the Leo Spur. The Leo Spur is
sparsely populated but among its constituents there are two associations that
contain only dwarf galaxies.
