Space interferometry Mission: dynamical observations of galaxies (SIMDOG) key project

Edward J. Shaya; R. Brent Tully; P. J. E. Peebles; John L. Tonry; Kirk Borne; Stuart N. Vogel; Adi Nusser; Dennis Zaritsky

doi:10.1117/12.460695

26 February 2003 Space interferometry mission dynamical observations of galaxies (SIMDOG) key project

Edward J. Shaya, R. Brent Tully, P. J. E. Peebles, John L. Tonry, Kirk Borne, Stuart N. Vogel, Adi Nusser, Dennis Zaritsky

Author Affiliations +

Proceedings Volume 4852, Interferometry in Space; (2003) https://doi.org/10.1117/12.460695
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The Space Interferometry Mission (SIM) spacecraft will be used to measure the proper motions for a sample of ~30 nearby galaxies. At this time there are no proper motion measurements of galaxies beyond the satellite systems of the Milky Way. With the capability of measuring absolute positions to 4 mas (microarcsecond) accuracy and a five-year baseline, SIM will be able to measure proper motions as small as 10 km/s over the Local Group and 40 km/s at 4 Mpc. The motion of each galaxy will be monitored by targeting 5-10 stars that are brighter than 20th magnitude. SIM measurements will lead to knowledge of the full 6-dimensional position and velocity vectors of each galaxy. In conjunction with gravitational flow modeling, improved total mass measurements of individual galaxies and the fractional contribution of dark matter to galaxies of the Local Group will be obtained. The project includes development of theoretical methods for orbital calculations.

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Edward J. Shaya, R. Brent Tully, P. J. E. Peebles, John L. Tonry, Kirk Borne, Stuart N. Vogel, Adi Nusser, and Dennis Zaritsky "Space interferometry mission dynamical observations of galaxies (SIMDOG) key project", Proc. SPIE 4852, Interferometry in Space, (26 February 2003); https://doi.org/10.1117/12.460695

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