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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…
Recombination Ghosts in Littrow Configuration: Implications for Spectrographs Using Volume Phase Holographic Gratings
Eric B. Burgh, Matthew A. Bershady, Kyle B. Westfall +1
We report the discovery of optical ghosts generated when using Volume Phase Holographic (VPH) gratings in spectrographs employing the Littrow configuration. The ghost is caused by…
NGC 3310 and Its Tidal Debris: Remnants of Galaxy Evolution
Elizabeth H. Wehner, John S. Gallagher, Polichronis Papaderos +2
NGC 3310 is a local galaxy with an intense, ongoing starburst thought to result from a merger with a companion galaxy. It has several known tidal features in the northwest and sout…
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…
Exploring Halo Substructure with Giant Stars VIII: The Extended Structure of the Sculptor Dwarf Spheroidal Galaxy
Kyle B. Westfall, Steven R. Majewski, James C. Ostheimer +4
(Abridged) We explore the spatial distribution of stars in the Sculptor dwarf spheroidal (dSph) galaxy over an area of 7.82 deg^2. We identify red giant branch (RGB) starts via Was…