Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911306r&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #113.06; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Peculiar motions are a powerful tool for examining the underlying mass distribution of the local Universe. By using new tracers of the local velocity-field we are able to constrain models of the density-field based on all-sky galaxy surveys. These models allow us to study the dynamics of the local Universe and address issues such as the cause of the Local Group (LG) motion relative to the CMB.
Key to our understanding of the LG motion is a study of the Great Attractor, a nearby supercluster buried in the Zone of Avoidance. A new survey of this region, together with recent multi-band imaging, reveals the dominant structure to be a large filament approximately 120 Mpc long.
Finally, a new reconstruction of the local density and velocity fields based on the first all-sky, X-ray selected, galaxy cluster catalogue is presented. This catalogue offers a complementary mapping to the usual infrared based catalogues that tend to undersample the cores of clusters. Combining the two maps affords us a better understanding of the true mass distribution in the local Universe.
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