A Numerical Action Method-Based Interpretation of the Dynamical State of the M81 Group

Details A Numerical Action Method-Based Interpretation of the Dynamical State of the M81 Group A Numerical Action Method-Based Interpretation of the Dynamical State of the M81 Group

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940209j&link_type=abstract

American Astronomical Society, AAS Meeting #219, #402.09

Astronomy and Astrophysics

Astronomy

Scientific paper

The Numerical Action Method (NAM) is a fully non-linear technique that can be used to analyze galaxy dynamics. We apply NAM to a catalog that includes a complete volume-limited sample of 150 galaxies within 4.5 Mpc. Each of these nearby galaxies' distances have been measured in a consistent manner by applying the Tip of the Red Giant Method to observations from the Hubble Space Telescope. The combination of distance information and location on the sky with the assumption that galaxies' peculiar motions go to zero at early times set the boundary conditions for minimizing the action of each galaxy. The results from NAM yield complete phase-space information for each galaxy through time. These solutions are not unique, but are assessed based on the degree that they match with each galaxy's measured peculiar radial velocity. This agreement depends on the mass of the galaxies, and thus NAM provides constraints on the galaxies' total dynamical masses. We present a reconstruction of the orbits and estimates of the masses of the galaxies of the M81 group. This work is supported through HST program: SNAP-12546.

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