NED Abstract 
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Reproduced by permission

2008ApJ...676..184T

Our Peculiar Motion Away from the Local Void

Tully, R. Brent; Shaya, Edward J.; Karachentsev, Igor D.; Courtois, Helene
M.; Kocevski, Dale D.; Rizzi, Luca; Peel, Alan

Abstract. The peculiar velocity of the Local Group of galaxies
manifested in the cosmic microwave background dipole is found to
decompose into three dominant components. The three components are
clearly separated because they arise on distinct spatial scales and are
fortuitously almost orthogonal in their influences. The nearest, which
is distinguished by a velocity discontinuity at ~7 Mpc, arises from the
evacuation of the Local Void. We lie in the Local Sheet that bounds the
void. Random motions within the Local Sheet are small, and we advocate a
reference frame with respect to the Local Sheet in preference to the
Local Group. Our Galaxy participates in the bulk motion of the Local
Sheet away from the Local Void. The component of our motion on an
intermediate scale is attributed to the Virgo Cluster and its
surroundings, 17 Mpc away. The third and largest component is an
attraction on scales larger than 3000 km s^-1^ and centered near the
direction of the Centaurus Cluster. The amplitudes of the three
components are 259, 185, and 455 km s^-1^, respectively, adding
collectively to 631 km s^-1^ in the reference frame of the Local Sheet.
Taking the nearby influences into account, particularly that of the
Local Void, causes the residual attributed to large scales to align with
observed concentrations of distant galaxies and reduces somewhat the
amplitude of motion attributed to their pull. Concerning the motion of
~260 km s^-1^ away from the Local Void, given the velocities expected
from gravitational instability theory in the standard cosmological
paradigm, the distance to the center of the Local Void must be at least
23 Mpc from our position. The Local Void is extremely large. 

Key words: Cosmology: Dark Matter, Galaxies: Distances and Redshifts,
Cosmology: Large-Scale Structure of Universe
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2008ApJ...686.1523T

Erratum: "Our Peculiar Motion Away from the Local Void" (ApJ, 676, 184
[2008])

Tully, R. Brent; Shaya, Edward J.; Karachentsev, Igor D.; Courtois,
Helene M.; Kocevski, Dale D.; Rizzi, Luca; Peel, Alan

Abstract. Column (28) in Table 1 was mislabeled. The observed H I line
profile parameter W_20_, the line width at 20% of peak intensity, is
related to the derived parameter W^i^_R_, defined by Tully & Fouque
(ApJS, 58, 67 [1985]) to agree statistically with twice the maximum
rotation
   The data in column (28) in Table 1 are incorrectly identified as
representing W^i^_R_, the derived parameter. In fact, the data in this
column are values of W_20_, the observed parameter. In the electronic
edition of Table 1, the data within the table are unchanged, but the
metadata description of column (28) should be corrected with the new
electronic table given here. 

Key words: Errata, Addenda
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