Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..357p&link_type=abstract
Astronomy Letters, vol. 30, p. 357-367 (2004)
Astronomy and Astrophysics
Astronomy
9
Scientific paper
We use a new expanded and partially modified sample of 1501 thin edge-on spiral galaxies from the RFGC catalog to analyze the non-Hubble bulk motions of galaxies on the basis of a generalized multiparameter Tully-Fisher relation. The results obtained have confirmed and refined our previous conclusions (Parnovsky et al. 2001), in particular, the statistical significance of the quadrupole and octupole components of the galaxy bulk velocity field. The quadrupole component, which is probably produced by tidal forces from overdense regions, leads to a difference in the recession velocities of galaxies on scales of 8000-10000 km/s up to 6% of their Hubble velocity. On Local Supercluster scales (3000 km/s), its contribution increases to about 20%. Including the octupole components in the model causes the dipole component to decrease to the 1 sigma level. In contrast, in the dipole model, the galaxy bulk velocity relative to the frame of reference of the cosmic microwave background is 310 +/- 75 km/s toward the apex with l=311 deg and b=12 deg. We also consider a sample of 1493 galaxies that was drawn using a more stringent galaxy selection criterion. The difference between the results of our data analysis for this sample and for the sample of 1501 galaxies is primarily attributable to a decrease in the dipole velocity component (290 +/- 75 km/s toward the apex with l=310 deg and b=12 deg) and a decrease in sigma by about 2%.
Parnovsky S. L.
Tugay A. V.
No associations
LandOfFree
Bulk Motions of Flat Galaxies on 100-Mpc Scales from New Data 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 Bulk Motions of Flat Galaxies on 100-Mpc Scales from New Data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bulk Motions of Flat Galaxies on 100-Mpc Scales from New Data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-891165