SIMBAD references

2011ApJ...743..123K - Astrophys. J., 743, 123 (2011/December-3)

Fast motions of galaxies in the Coma I cloud: a case of dark attractor?


Abstract (from CDS):

We note that nearby galaxies having high negative peculiar velocities are distributed over the sky very inhomogeneously. A part of this anisotropy is caused by the "Local Velocity Anomaly," i.e., by the bulk motion of nearby galaxies away from the Local Void. However, half of the fast-flying objects reside within a small region [R.A. = 11h.5-13h.0, decl. = +20°-40°] known as the Coma I cloud. According to Makarov & Karachentsev, this complex contains 8 groups, 5 triplets, 10 pairs, and 83 single galaxies with a total mass of 4.7x1013 M. We use 122 galaxies in the Coma I region with known distances and radial velocities VLG< 3000 km/s to draw the Hubble relation for them. The Hubble diagram shows a Z-shaped effect of infall with an amplitude of +200 km/s on the nearby side and -700 km/s on the back side. This phenomenon can be understood as the galaxy infall toward a dark attractor with a mass of ∼2x1014 M situated at a distance of 15 Mpc from us. The existence of a large void between the Coma and Virgo clusters also probably affects the Hubble flow around the Coma I.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: clusters: individual: Coma I - galaxies: distances and redshifts

VizieR on-line data: <Available at CDS (J/ApJ/743/123): table1.dat table2.dat table3.dat table4.dat>

CDS comments: UGC06684N1 is 2MASX J11433269+3127279 in SIMBAD. In table2, N3990 is a misprint for N3900.

Simbad objects: 250

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