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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…
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…
Discovery and Characterization of 3000+ Main-Sequence Binaries from APOGEE Spectra
Kareem El-Badry, Yuan-Sen Ting, Hans-Walter Rix +7
We develop a data-driven spectral model for identifying and characterizing spatially unresolved multiple-star systems and apply it to APOGEE DR13 spectra of main-sequence stars. Bi…
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 (…
Signatures of unresolved binaries in stellar spectra: implications for spectral fitting
Kareem El-Badry, Hans-Walter Rix, Yuan-Sen Ting +5
The observable spectrum of an unresolved binary star system is a superposition of two single-star spectra. Even without a detectable velocity offset between the two stellar compone…
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VII. Properties of the Host Galaxy and Constraints on the Merger Timescale
P. K. Blanchard, E. Berger, W. Fong +21
We present the properties of NGC 4993, the host galaxy of GW170817, the first gravitational wave (GW) event from the merger of a binary neutron star (BNS) system and the first with…
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…
Measuring 14 elemental abundances with R=1,800 LAMOST spectra
Yuan-Sen Ting, Hans-Walter Rix, Charlie Conroy +2
The LAMOST survey has acquired low-resolution spectra (R=1,800) for 5 million stars across the Milky Way, far more than any current stellar survey at a corresponding or higher spec…
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,…
Prospects for Measuring Abundances of >20 Elements with Low-resolution Stellar Spectra
Yuan-Sen Ting, Charlie Conroy, Hans-Walter Rix +1
Understanding the evolution of the Milky Way calls for the precise abundance determination of many elements in many stars. A common perception is that deriving more than a few elem…
The Extended IRTF Spectral Library: Expanded coverage in metallicity, temperature, and surface gravity
Alexa Villaume, Charlie Conroy, Benjamin Johnson +3
We present a spectral library of 284 stars observed with the medium-resolution infrared spectrograph, SpeX, at the 3.0 meter NASA Infrared Telescope Facility (IRTF) on…
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…
The influence of atomic diffusion on stellar ages and chemical tagging
Aaron Dotter, Charlie Conroy, Phillip Cargile +1
In the era of large stellar spectroscopic surveys, there is emphasis on deriving not only stellar abundances but also ages for millions of stars. In the context of Galactic archeol…
The Evolution and Properties of Rotating Massive Star Populations
Jieun Choi, Charlie Conroy, Nell Byler
We investigate the integrated properties of massive (>10 Msun), rotating, single-star stellar populations for a variety of initial rotation rates (v/vcrit=0.0, 0.2, 0.4, 0.5, and 0…