NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-24 T05:49:43 PDT
Help | Comment | NED Home

For refcode 2011ApJ...743..123K:
Retrieve 236 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2011ApJ...743..123K Fast Motions of Galaxies in the Coma I Cloud: A Case of Dark Attractor? Karachentsev, Igor D.; Nasonova, Olga G.; Courtois, Helene M. Abstract. 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.= 11{.^{h}}5{--}13{.^{h}}0, decl.= +20^{deg} {--}40^{deg}] 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 4.7 x 10^13^ M_sun_. We use 122 galaxies in the Coma I region with known distances and radial velocities V_LG_ < 3000 km s^-1^ to draw the Hubble relation for them. The Hubble diagram shows a Z-shaped effect of infall with an amplitude of +200 km s^-1^ on the nearby side and -700 km s^-1^ on the back side. This phenomenon can be understood as the galaxy infall toward a dark attractor with a mass of ~2 x 10^14^ M_sun_ 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. Key words: cosmology: observations, galaxies: clusters: individual: Coma I, galaxies: distances and redshifts
Retrieve 236 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home