Local Field of Galaxy Velocities

Details Local Field of Galaxy Velocities Local Field of Galaxy Velocities

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap.....44....1k&link_type=abstract

Astrophysics (English translation of Astrofizika), v. 44, Issue 1, p. 1-13 (2001).

Astronomy and Astrophysics

Astrophysics

10

Scientific paper

A sample of 145 galaxies having radial velocities relative to the centroid of the Local Group V LG D H ij , with principal values of 81:62:48 in km/sec·Mpc, which have a standard error of 4 km/sec·Mpc. The minor axis of the Hubble ellipsoid is oriented almost along the polar axis of the Local Supercluster, while the major axis forms an angle = (29 ± 5)° with the direction toward the center of the Virgo Cluster. Such a configuration of the peculiar-velocity field shows unsatisfactory agreement with the model of a spherically symmetric flow of galaxies toward the Virgo Cluster. Rotation of the Local Supercluster may be one reason for this difference. The peculiar velocities of galaxies within a volume with D V = 74 km/sec, a considerable part of which is due to the virial motions of galaxies in groups and to distance errors. For field galaxies, located in a layer of 1 < D < 3 Mpc around the Local Group, the radial-velocity dispersion does not exceed 25 km/sec. The velocity—distance relation, constructed from the 20 closest galaxies around the Local Group with D < 3 Mpc and with errors σ(D) < 0.2 Mpc, exhibits the expected effect of gravitational deceleration. Using the estimate of R 0 = (0.96 ± 0.05) Mpc for the observed radius of the zero-velocity sphere, we determined the total mass of the Local Group to be (1.2 ± 0.2)·1012 M &sun;, which agrees well with the sum of the virial masses of the subgroups of galaxies around the Local Group and M31. The ratio of the Local Group's total mass (within R 0) to its luminosity is M/L = (23 ± 4) M &sun;/L &sun;, which does not require the existence of supermassive dark halos around our Galaxy and M31.

Affiliated with

Also associated with

No associations

Rating

Local Field of Galaxy Velocities does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Local Field of Galaxy Velocities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local Field of Galaxy Velocities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-922330