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10 papers · 2 filters
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…
SDSS-V: Pioneering Panoptic Spectroscopy
Juna A. Kollmeier, Gail Zasowski, Hans-Walter Rix +47
SDSS-V will be an all-sky, multi-epoch spectroscopic survey of over six million objects. It is designed to decode the history of the Milky Way, trace the emergence of the chemical…
Hunting Faint Dwarf Galaxies in the Field Using Integrated Light Surveys
Shany Danieli, Pieter van Dokkum, Charlie Conroy
We discuss the approach of searching low mass dwarf galaxies, , in the general field, using integrated light surveys. By exploring the limiting sur…
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 (…
Stellar Absorption Line Analysis of Local Star-Forming Galaxies: The Relation Between Stellar Mass, Metallicity, Dust Attenuation and Star Formation Rate
H. Jabran Zahid, Rolf-Peter Kudritzki, Charlie Conroy +2
We analyze the optical continuum of star-forming galaxies in SDSS by fitting stacked spectra with stellar population synthesis models to investigate the relation between stellar ma…
Low Metallicities and Old Ages for Three Ultra-Diffuse Galaxies in the Coma Cluster
Meng Gu, Charlie Conroy, David Law +17
A large population of ultra-diffuse galaxies (UDGs) was recently discovered in the Coma cluster. Here we present optical spectra of three such UDGs, DF7, DF44 and DF17, which have…
Hot dust in Panchromatic SED Fitting: Identification of AGN and improved galaxy properties
Joel Leja, Benjamin D. Johnson, Charlie Conroy +1
Forward modeling of the full galaxy SED is a powerful technique, providing self-consistent constraints on stellar ages, dust properties, and metallicities. However, the accuracy of…
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,…
The IRX-Beta Dust Attenuation Relation in Cosmological Galaxy Formation Simulations
Desika Narayanan, Romeel Dave, Benjamin Johnson +3
We utilise a series of high-resolution cosmological zoom simulations of galaxy formation to investigate the relationship between the ultraviolet (UV) slope, beta, and the ratio of…
Gaia reveals a metal-rich in-situ component of the local stellar halo
Ana Bonaca, Charlie Conroy, Andrew Wetzel +2
We use the first Gaia data release, combined with RAVE and APOGEE spectroscopic surveys, to investigate the origin of halo stars within <~3 kpc from the Sun. We identify halo stars…