BB303
Proper motion of Galaxies in and beyond the Local Group
Abstract
In the concordance Lambda-CDM cosmological model, galaxies grow hierarchical in mass by accreting smaller galaxies. Nearby examples of this cosmic cannibalism are found in the environments of the Milky Way and the Andromeda Galaxy (M31), in the Local Group (LG), nearby galaxy groups, and clusters. However, a description of galaxy interactions cannot be complete without knowing the full 3d space motions of the galaxies. Exploiting the sensitivity upgrade of the major VLBI facilities opens up the possibility to do more targets than previously possible. The main goal of this project is to measure accurate *absolute* space motions of galaxies in the LG, in the M81 group of galaxies, and even inside the Virgo Cluster. This will lead, together with detailed simulations to a better understanding of matter distribution in- and outside the LG, and the evolution of galaxies in these environments . The LG is also a good test bed for alternative theories of gravity (e.g. MOND). Furthermore, geomet
Investigators
| Name | Institution |
|---|---|
| GBT Operator | Green Bank Observatory |
| vlbaops vlbaops | National Radio Astronomy Observatory |
| Jacqueline van Gorkom | Columbia University |
| Andrea Tarchi | Istituto Nazionale di Astrofisica |
| Lorant Sjouwerman | National Radio Astronomy Observatory |
| E. Roediger | Bremen, Jacobs University |
| Tom Oosterloo | Netherlands Institute for Radio Astronomy |
| Laurent Loinard | México, Universidad Nacional Autónoma de; Harvard University |
| Avi Loeb | Center for Astrophysics | Harvard & Smithsonian |
| Chris Henkel | Max-Planck-Institut für Radioastronomie |
| Mike Garrett | Manchester, University of |
| Heino Falcke | Netherlands Institute for Radio Astronomy; Nijmegen, Radboud Universiteit |
| Jeremy Darling | Colorado at Boulder, University of |
| Geoff Bower | California at Berkeley, University of |
| Karl Menten | Max-Planck-Institut für Radioastronomie |
| Mark Reid | Center for Astrophysics | Harvard & Smithsonian |
| Andreas Brunthaler * | Max-Planck-Institut für Radioastronomie |
| effobs effobs | Max-Planck-Institut für Radioastronomie |
| vlbiobs vlbiobs | National Radio Astronomy Observatory |
* indicates the PI