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- California Institute of TechnologyUS356 papers
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6 papers · 2 filters
Mapping the Tidal Disruption of the Hercules Dwarf: A Wide-Field DECam Imaging Search for RR Lyrae Stars
Christopher Garling, Beth Willman, David J. Sand +10
We investigate the hypothesized tidal disruption of the Hercules ultra-faint dwarf galaxy (UFD). Previous tidal disruption studies of the Hercules UFD have been hindered by the hig…
Deep Subaru Hyper Suprime-Cam observations of Milky Way satellites Columba I and Triangulum II
Jeffrey L. Carlin, David J. Sand, Ricardo R. Munoz +9
We present deep, wide-field Subaru Hyper Suprime-Cam photometry of two recently discovered satellites of the Milky Way (MW): Columba I and Triangulum II. The color magnitude diagra…
Discovery of diffuse dwarf galaxy candidates around M101
P. Bennet, D. J. Sand, D. Crnojević +3
We have conducted a search of a 9 deg region of the CFHTLS around the Milky Way analog M101 (D7 Mpc), in order to look for previously unknown low surface brightness gal…
The faint globular cluster in the dwarf galaxy Andromeda I
Nelson Caldwell, Jay Strader, David J. Sand +2
Observations of globular clusters in dwarf galaxies can be used to study a variety of topics, including the structure of dark matter halos and the history of vigorous star formatio…
Identification of the Hard X-ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31
M. Yukita, A. Ptak, A. E. Hornschemeier +15
We report the identification of a bright hard X-ray source dominating the M31 bulge above 25 keV from a simultaneous NuSTAR-Swift observation. We find that this source is the count…
Structural and Photometric Properties of the Andromeda Satellite Dwarf Galaxy Lacerta I from Deep Imaging with WIYN pODI
Katherine L. Rhode, Denija Crnojevic, David J. Sand +3
We present results from WIYN pODI imaging of Lacerta I (And XXXI), a satellite dwarf galaxy discovered in the outskirts of the Andromeda galaxy (M31) in Pan-STARRS1 survey data. Ou…