Optical galaxies within 8000 km s-1 - II. the Peculiar Velocity of the Local Group

Details Optical galaxies within 8000 km s-1 - II. the Peculiar Velocity of the Local Group Optical galaxies within 8000 km s-1 - II. the Peculiar Velocity of the Local Group

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265...72h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 1/NOV1, P. 72, 1993

Mathematics

Logic

43

Scientific paper

Optical galaxies within 8000 km s^-1^ are used to predict the peculiar velocity of the Local Group. Our sample is drawn from the UGC and ESO catalogues. The predicted motion is 28^deg^-32^deg^ away from the motion of the Local Group in the CMB frame, and the predicted velocity is 760 +/- 160 β_0_ km s^-1^, where β_0_ = {OMEGA}^0.6^b_0_^-1^. The direction of the optical dipole agrees with the directions of the IRAS dipoles, and is misaligned from the CMB dipole in the same sense. If it is assumed that the galaxies within 8000 km s^-1^ are responsible for all of the 606 km s^-1^ velocity of the Local Group, then β_0_ = 0.80_-0.13_^+0.21^ (1 σ errors). The density of mass clustered with optical galaxies is then {OMEGA} = 0.69_-0.18_^_0.33^, if mass traces optical light (b_0_ = 1). Alternatively, if {OMEGA} = 1 then optical galaxies are mildly biased with b_0_ = 1.25 +/- 0.26. For cosmological models that fit the large-scale galaxy counts, however, we do not expect the mass within 8000 km s^-1^ to account for all of the motion of the Local Group, and a better estimate is β_0_ = 0.72_- 0.18_^+0.37^. For the same model, but using only the galactic Z-component of the dipole, we obtain β_0_ = 0.49_-0.11_^+0.18^. Then, if mass traces light, {OMEGA} > 0.14 at the 95 per cent confidence level.

Affiliated with

Also associated with

No associations

Rating

Optical galaxies within 8000 km s-1 - II. the Peculiar Velocity of the Local Group 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 Optical galaxies within 8000 km s-1 - II. the Peculiar Velocity of the Local Group, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical galaxies within 8000 km s-1 - II. the Peculiar Velocity of the Local Group will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-811387