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6 papers · 2 filters
The effect of feedback and reionization on star formation in low-mass dwarf galaxy haloes
Christine M. Simpson, Greg L. Bryan, Kathryn V. Johnston +4
We simulate the evolution of a 10^9 Msun dark matter halo in a cosmological setting with an adaptive-mesh refinement code as an analogue to local low luminosity dwarf irregular and…
The Space Motion of Leo I: Hubble Space Telescope Proper Motion and Implied Orbit
Sangmo Tony Sohn, Gurtina Besla, Roeland P. van der Marel +3
We present the first absolute proper motion measurement of Leo I, based on two epochs of HST ACS/WFC images separated by ~5 years. The average shift of Leo I stars with respect to…
The M31 Velocity Vector. III. Future Milky Way-M31-M33 Orbital Evolution, Merging, and Fate of the Sun
Roeland P. van der Marel, Gurtina Besla, T. J. Cox +2
We study the future orbital evolution and merging of the MW-M31-M33 system, using a combination of collisionless N-body simulations and semi-analytic orbit integrations. Monte-Carl…
The M31 Velocity Vector. II. Radial Orbit Towards the Milky Way and Implied Local Group Mass
Roeland P. van der Marel, Mark Fardal, Gurtina Besla +5
We determine the velocity vector of M31 with respect to the Milky Way and use this to constrain the mass of the Local Group, based on HST proper-motion measurements presented in Pa…
Vertical structure of a supernova-driven turbulent magnetized ISM
Alex S. Hill, M. Ryan Joung, Mordecai-Mark Mac Low +4
Stellar feedback drives the circulation of matter from the disk to the halo of galaxies. We perform three-dimensional magnetohydrodynamic simulations of a vertical column of the in…
Identifying Contributions to the Stellar Halo from Accreted, Kicked-Out, and In Situ Populations
Allyson A. Sheffield, Steven R. Majewski, Kathryn V. Johnston +10
[Abridged] We present a medium-resolution spectroscopic survey of late-type giant stars at mid-Galactic latitudes of (30), designed to probe the properties…