FAST MOTIONS OF GALAXIES IN THE COMA I CLOUD: A CASE OF DARK ATTRACTOR?
Journal Article
·
· Astrophysical Journal
- Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhniy Arkhyz, Karachei-Cherkessia 369167 (Russian Federation)
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 known as the Coma I cloud. According to Makarov and Karachentsev, this complex contains 8 groups, 5 triplets, 10 pairs, and 83 single galaxies with a total mass of 4.7 Multiplication-Sign 10{sup 13} M{sub Sun }. We use 122 galaxies in the Coma I region with known distances and radial velocities V{sub LG} < 3000 km s{sup -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{sup -1} on the nearby side and -700 km s{sup -1} on the back side. This phenomenon can be understood as the galaxy infall toward a dark attractor with a mass of {approx}2 Multiplication-Sign 10{sup 14} M{sub 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.
- OSTI ID:
- 22004478
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 743; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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