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The Binary Fraction of Stars in Dwarf Galaxies: the Cases of Draco and Ursa Minor
Meghin Spencer, Mario Mateo, Edward Olszewski +3
Measuring the frequency of binary stars in dwarf spheroidal galaxies (dSphs) requires data taken over long time intervals. We combine radial velocity measurements from five literat…
Sub-percent Photometry: Faint DA White Dwarf Spectophotometric Standards for Astrophysical Observatories
Gautham Narayan, Thomas Matheson, Abhijit Saha +18
We have established a network of 19 faint (16.5 mag 19 mag) northern and equatorial DA white dwarfs as spectrophotometric standards for present and future wide-field observ…
Galaxy Cluster Mass Estimates in the Presence of Substructure
Evan Tucker, Matthew G. Walker, Mario Mateo +3
We develop and implement a model to analyze the internal kinematics of galaxy clusters that may contain subpopulations of galaxies that do not independently trace the cluster poten…
A Giant Protocluster of Galaxies at Redshift 5.7
Linhua Jiang, Jin Wu, Fuyan Bian +14
Galaxy clusters trace the largest structures of the Universe and provide ideal laboratories for studying galaxy evolution and cosmology. Clusters with extended X-ray emission have…
Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge
Sergey E. Koposov, Matthew G. Walker, Vasily Belokurov +9
We report the discovery of a nearby dwarf galaxy in the constellation of Hydrus, between the Large and the Small Magellanic Clouds. Hydrus 1 is a mildy elliptical ultra-faint syste…
Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569
Christian I. Johnson, R. Michael Rich, Nelson Caldwell +4
Photometric and spectroscopic analyses have shown that the Galactic bulge cluster Terzan 5 hosts several populations with different metallicities and ages that manifest as a double…