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The SLUGGS Survey: The Inner Dark Matter Density Slope of the Massive Elliptical Galaxy NGC 1407
Asher Wasserman, Aaron J. Romanowsky, Jean Brodie +7
We investigate the dark matter density profile of the massive elliptical galaxy, NGC 1407, by constructing spherically symmetric Jeans models of its field star and globular cluster…
2FGL J0846.0+2820: A new neutron star binary with a giant secondary and variable -ray emission
Samuel J. Swihart, Jay Strader, Tyrel J. Johnson +11
We present optical photometric and spectroscopic observations of the likely stellar counterpart to the unassociated \emph{Fermi}-Large Area Telescope (LAT) -ray source 2FGL J084…
Cold Filamentary Accretion and the Formation of Metal Poor Globular Clusters and Halo Stars
Nir Mandelker, Pieter G. van Dokkum, Jean P. Brodie +2
We propose that cold filamentary accretion in massive galaxies at high redshift can lead to the formation of star-forming clumps in the halos of these galaxies without the presence…
The Stellar Populations of Two Ultra-Diffuse Galaxies from Optical and Near-infrared Photometry
Viraj Pandya, Aaron J. Romanowsky, Seppo Laine +11
We present observational constraints on the stellar populations of two ultra-diffuse galaxies (UDGs) using optical through near-infrared (NIR) spectral energy distribution (SED) fi…
Initial Mass Function Variability (or not) Among \\ Low-Velocity Dispersion, Compact Stellar Systems
Alexa Villaume, Jean Brodie, Charlie Conroy +2
Analyses of strong gravitational lenses, galaxy-scale kinematics, and absorption line stellar population synthesis (SPS) have all concluded that the stellar initial mass function (…
Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
Pieter van Dokkum, Roberto Abraham, Aaron J. Romanowsky +7
We present Hubble Space Telescope imaging of two ultra diffuse galaxies (UDGs) with measured stellar velocity dispersions in the Coma cluster. The galaxies, Dragonfly 44 and DFX1,…