Our Peculiar Motion Away from the Local Void

By R. B. Tully, Edward Shaya, I. Karachentsev, Hélène Courtois, D. Kocevski, L. Rizzi, A. Peel. 2007

332 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/99023f3d75ea821bd9c6b9cfb72ac9c06c10c8d2

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Citations in the corpus

Consistently large cosmic flows on scales of 100 h−1 Mpc: a challenge for the standard ΛCDM cosmology (2008, background): “The motion of the LG with respect to the ‘Local Sheet’ in which it is embedded is only ∼60 km s−1 (Tully et al. 2008), thus most of the LG’s motion is due to structures on scales larger than the Local Sheet, i.e. beyond 5 h−1 Mpc (where h is the Hubble constant in units of 100 km s−1 Mpc−1).”
Tracing the cosmic web (2017, background): “Its effectively repulsive dynamical influence has been demonstrated in studies of cosmic flows in the local volume (Tully et al. 2008), while a recent study even indicated the dominant impact of a major depression at a distance of more than 100 Mpc (the so-called “dipole repeller”, Hoffman et al.…”
COSMICFLOWS-2: THE DATA (2013, methodology): “Cosmicflows-1 provided, at the time, the densest coverage of distances locally but it was severely restricted by a cutoff of 3000 km s−1.”
CONFIRMATION OF FAINT DWARF GALAXIES IN THE M81 GROUP (2013, background): “This plane is essentially orthogonal to the supergalactic plane although the long axis New Dwarf Galaxies in M81 7 is aligned with the long axis of the Local Sheet (Tully et al. 2008); ie, toward the Virgo Cluster.”
THE EXTRAGALACTIC DISTANCE DATABASE (2009, methodology): “The K magnitude is from 2MASS and the translation from apparent to absolute magnitude uses distances based on a Numerical Action Model (Shaya et al. 1995) constrained by the measured distances reported in Tully 3000 (Tully et al. 2008).”
Local gravity versus local velocity: solutions for β and non-linear bias (2010, methodology): “Lavaux et al. (2010) employed a sophisticated version of the nonlinear MAK reconstruction method (Frisch et al. 2002b) to compare the 2MRS-predicted velocities with the 3 K velocity catalogue (Tully et al. 2008) of 1791 galaxies with redshifts <3000 km s−1.”
The ATLAS3D project – I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria (2010, methodology): “In most cases the distancesre based on redshift as provided by large redshift surveys, buta n mber of more accurate distances are available based on other methods (see e.g. the recent compilations of Tully et al. 2008, 2009; Karachentsev & Nasonova 2010).”
HyperLEDA. III. The catalogue of extragalactic distances (2014, background): “In particular, the deviation of radial velocities from the Hubble law gives us information about cosmic flows (Tully et al. 2008) and mass distributions (Karachentsev et al. 2009; Courtois et al. 2012).”
UPDATED NEARBY GALAXY CATALOG (2013, background): “According to Tully et al. (2008), the presence of these two main elements of the local large-scale structure generates two velocity components of the Local Group and surrounding galaxies: ∼ 180 km s−1 towards the Virgo cluster center (12h30m+12◦), and ∼ 260 km s−1 in the direction away from the…”
THE LOW-LUMINOSITY END OF THE RADIUS–LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI (2013, methodology): “The uncertainty in the distances at present provides the single largest source of uncertainty in the AGN luminosity measurements, especially as Tully et al. (2008) have shown that peculiar velocities may still be important (>10”
Galaxy Groups Within 3500 km s−1 (2017, methodology): “The volume that includes this entity along with the adjacent 14+8 is shown in Figure 8, an enlargement of the region in Figure 7 around ~SGX 0.5, ~SGY 3 Mpc.”
Dwarf galaxy planes: the discovery of symmetric structures in the Local Group (2013, background): “Tully et al. (2008) have determined the motion of the LG within the Local Sheet, the nearby galaxies (distances less than 7 Mpc) which have low relative peculiar velocities.”