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Caught in formation: the nuclear-cluster-to-be in NGC 2139
David R. Andersen, C. Jakob Walcher, Torsten Boeker +4
Close to its center, the bulgeless galaxy NGC 2139 hosts a star cluster that is younger and less massive than any actual nuclear star cluster (NC) studied so far. We have measured…
Deconstructing Disk Velocity Distribution Functions in the Disk-Mass Survey
Kyle B. Westfall, Matthew A. Bershady, Marc A. W. Verheijen +2
We analyze integral-field ionized gas and stellar line-of-sight kinematics in the context of determining the stellar velocity ellipsoid for spiral galaxies observed by the Disk-Mas…
The Photometric and Kinematic Structure of Face-On Disk Galaxies. I. Sample Definition, H-alpha Integral Field Spectroscopy, and HI Line-Widths
David R. Andersen, Matthew A. Bershady, Linda S. Sparke +5
We present a survey of the photometric and kinematic properties of 39 nearby, nearly face-on disk galaxies. Our approach exploits echelle-resolution integral-field spectroscopy of…
The Disk Mass Project: breaking the disk-halo degeneracy
Marc A. W. Verheijen, Matthew A. Bershady, Rob A. Swaters +2
Little is known about the content and distribution of dark matter in spiral galaxies. To break the degeneracy in galaxy rotation curve decompositions, which allows a wide range of…
Asymmetric Drift and the Stellar Velocity Ellipsoid
Kyle B. Westfall, Matthew A. Bershady, Marc A. W. Verheijen +2
We present the decomposition of the stellar velocity ellipsoid using stellar velocity dispersions within a 40 deg wedge about the major-axis (sigma_maj), the epicycle approximation…
SparsePak: A Formatted Fiber Field-Unit for The WIYN Telescope Bench Spectrograph. II. On-Sky Performance
Matthew A. Bershady, David R. Andersen, Marc A. W. Verheijen +3
We present a performance analysis of SparsePak and the WIYN Bench Spectrograph for precision studies of stellar and ionized gas kinematics of external galaxies. We focus on spectro…