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The Panchromatic Hubble Andromeda Treasury II. Tracing the Inner M31 Halo with Blue Horizontal Branch Stars
Benjamin F. Williams, Julianne J. Dalcanton, Eric F. Bell +7
We attempt to constrain the shape of M31's inner stellar halo by tracing the surface density of blue horizontal branch (BHB) stars at galactocentric distances ranging from 2 kpc to…
Stellar Kinematics of the Andromeda II Dwarf Spheroidal Galaxy
Nhung Ho, Marla C. Geha, Ricardo R. Munoz +7
We present kinematical profiles and metallicity for the M31 dwarf spheroidal (dSph) satellite galaxy Andromeda II (And II) based on Keck DEIMOS spectroscopy of 531 red giant branch…
The Panchromatic Hubble Andromeda Treasury I: Bright UV Stars in the Bulge of M31
Philip Rosenfield, L. Clifton Johnson, Léo Girardi +20
As part of the Panchromatic Hubble Andromeda Treasury (PHAT) multi-cycle program, we observed a 12' \times 6.5' area of the bulge of M31 with the WFC3/UVIS filters F275W and F336W.…
A spectroscopic survey of Andromeda's Western Shelf
Mark A. Fardal, Puragra Guhathakurta, Karoline M. Gilbert +7
The Andromeda galaxy (M31) shows many tidal features in its halo, including the Giant Southern Stream (GSS) and a sharp ledge in surface density on its western side (the W Shelf).…
The Panchromatic Hubble Andromeda Treasury
J. J. Dalcanton, B. F. Williams, D. Lang +30
The Panchromatic Hubble Andromeda Treasury (PHAT) is an on-going HST Multicycle Treasury program to image ~1/3 of M31's star forming disk in 6 filters, from the UV to the NIR. The…
Internal Stellar Kinematics of M32 from the SPLASH Survey: Dark Halo Constraints and the Formation of Compact Elliptical Galaxies
Kirsten Howley, Puragra Guhathakurta, Roeland van der Marel +6
As part of the SPLASH survey of the Andromeda galaxy (M31) and its neighbors, we have obtained Keck/DEIMOS spectra of the compact elliptical (cE) satellite M32. This is the first r…
The Star Formation History of Leo T from Hubble Space Telescope Imaging
Daniel R. Weisz, Daniel B. Zucker, Andrew E. Dolphin +9
We present the star formation history (SFH) of the faintest known star-forming galaxy, Leo T, based on imaging taken with the Hubble Space Telescope (HST) Wide Field Planetary Came…