{The Motion of the Local Group With Respect to the}

Details {The Motion of the Local Group With Respect to the} {The Motion of the Local Group With Respect to the}

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8903l&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #89.03; Bulletin of the American Astronomical Society, Vol. 24, p.1264

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We have completed a program to measure the reflex motion of the Local Group with respect to an inertial frame defined by the 120 Abell and ACO clusters contained within 15,000 km/s. The observations consist of a full-sky peculiar velocity survey with an effective depth about four times that of the Seven Samurai Survey. The survey data are new, high-precision, two-color CCD images and extensive redshift data (some also new). Clusters are selected by heliocentric velocity and the sample is volume limited. We use the Hoessel (1980) relationship between the metric luminosities of the Brightest Clusters Galaxies (BCG) and the slope of their brightness profiles as the distance indicator. The Cousins R band luminosity within a metric radius of 10h(-1) kpc yields a typical distance error of 16% for a single BCG. The primary goal is to test for convergence of the local flow on scales within 10,000 km/s (i.e., alignment of the Local Group velocity vector with the Cosmic Microwave Background (CMB) Dipole). We find, however, that our sample is not at rest with respect to the CMB. The velocity of the Local Group relative to 15,000 km/s frame is 555 km/s towards l=214(deg,) b=-28(deg.) This vector is inconsistent with the Local Group absolute space velocity inferred from the CMB dipole anisotropy at greater than 99.9% confidence. An extensive error analysis has been conducted to validate this result. If the CMB dipole is doppler in origin, then this result implies that the frame itself is moving at 842 km/s towards l=339(deg,) b=+50(deg,) and that the Local Group motion is, thus, generated largely by mass concentrations beyond 100h(-1) Mpc.

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