Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276....1j&link_type=abstract
Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. 1, 1993
Astronomy and Astrophysics
Astrophysics
75
Scientific paper
The peculiar motion of the Local Group is determined from 15 clusters whose relative distances are known with minimum bias. The resulting local motion is 745 +/- 106 kms^-1^ towards l = 273^deg^, b = 3^deg^. This 7σ signal is in perfect statistical agreement with the motion inferred from the dipole of the cosmic microwave background. The median distance of 6400 km s^-1^ of the 15 clusters sets an upper limit to the comoving volume. - The three-dimensional peculiar motions of the clusters become 587 km s^-1^, if allowance is made for a 5 percent error of the cluster distances. The value compares well with the 489 km s^-1^ motion of the Virgo complex with respect to the cosmic microwave background. - The data imply a local slow-down of the expansion field due to the Virgo cluster of v_VC_ = 239 +/- 40 km s^-1^. An almost identical value, i.e. v_VC_ = 233 +/- 44 km s^-1^, is independently determined using the relative distances of the Virgo, UMa, and Fornax clusters and of eight nearby supernovae of type Ia. - These results do not require the adoption of any zero-point of the extragalactic distance scale.
Jerjen Helmut
Tammann Gustav A.
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