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Future Prospects: Deep Imaging of Galaxy Outskirts using Telescopes Large and Small
Roberto Abraham, Pieter van Dokkum, Charlie Conroy +5
The Universe is almost totally unexplored at low surface brightness levels. In spite of great progress in the construction of large telescopes and improvements in the sensitivity o…
A massive, quiescent, population II galaxy at a redshift of 2.1
Mariska Kriek, Charlie Conroy, Pieter G. van Dokkum +7
Unlike spiral galaxies such as the Milky Way, the majority of the stars in massive elliptical galaxies were formed in a short period early in the history of the Universe. The durat…
The Initial Mass Function in the Nearest Strong Lenses from SNELLS: Assessing the Consistency of Lensing, Dynamical, and Spectroscopic Constraints
Andrew B. Newman, Russell J. Smith, Charlie Conroy +2
We present new observations of the three nearest early-type galaxy (ETG) strong lenses discovered in the SINFONI Nearby Elliptical Lens Locator Survey (SNELLS). Based on their lens…
The Stellar Initial Mass Function in Early-Type Galaxies From Absorption Line Spectroscopy. IV. A Super-Salpeter IMF in the center of NGC 1407 from Non-Parametric Models
Charlie Conroy, Pieter van Dokkum, Alexa Villaume
It is now well-established that the stellar initial mass function (IMF) can be determined from the absorption line spectra of old stellar systems, and this has been used to measure…
Nebular Continuum and Line Emission in Stellar Population Synthesis Models
Nell Byler, Julianne J. Dalcanton, Charlie Conroy +1
Accounting for nebular emission when modeling galaxy spectral energy distributions (SEDs) is important, as both line and continuum emission can contribute significantly to the tota…
The Stellar Initial Mass Function in Early-Type Galaxies from Absorption Line Spectroscopy. III. Radial Gradients
Pieter van Dokkum, Charlie Conroy, Alexa Villaume +2
There is good evidence that the centers of massive early-type galaxies have a bottom-heavy stellar initial mass function (IMF) compared to the IMF of the Milky Way. Here we study t…
Deriving Physical Properties from Broadband Photometry with Prospector: Description of the Model and a Demonstration of its Accuracy Using 129 Galaxies in the Local Universe
Joel Leja, Benjamin D. Johnson, Charlie Conroy +2
Broadband photometry of galaxies measures an unresolved mix of complex stellar populations, gas, and dust. Interpreting these data is a challenge for models: many studies have show…
A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44
Pieter van Dokkum, Roberto Abraham, Jean Brodie +6
Recently a population of large, very low surface brightness, spheroidal galaxies was identified in the Coma cluster. The apparent survival of these Ultra Diffuse Galaxies (UDGs) in…
Redshift Measurement and Spectral Classification for eBOSS Galaxies with the Redmonster Software
Timothy A. Hutchinson, Adam S. Bolton, Kyle S. Dawson +13
We describe the redmonster automated redshift measurement and spectral classification software designed for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloa…
MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
Jieun Choi, Aaron Dotter, Charlie Conroy +3
This is the first of a series of papers presenting the Modules for Experiments in Stellar Astrophysics (MESA) Isochrones and Stellar Tracks (MIST) project, a new comprehensive set…
The MOSDEF Survey: The strong agreement between H-alpha and UV-to-FIR star formation rates for z~2 star-forming galaxies
Irene Shivaei, Mariska Kriek, Naveen A. Reddy +12
We present the first direct comparison between Balmer line and panchromatic SED-based SFRs for z~2 galaxies. For this comparison we used 17 star-forming galaxies selected from the…
Constructing Polynomial Spectral Models for Stars
Hans-Walter Rix, Yuan-Sen Ting, Charlie Conroy +1
Stellar spectra depend on the stellar parameters and on dozens of photospheric elemental abundances. Simultaneous fitting of these model labels to observed…
Pixel Color Magnitude Diagrams for Semi-Resolved Stellar Populations: The Star Formation History of Regions within the Disk and Bulge of M31
Charlie Conroy, Pieter van Dokkum
The analysis of stellar populations has, by and large, been developed for two limiting cases: spatially-resolved stellar populations in the color-magnitude diagram, and integrated…
Accelerated Fitting of Stellar Spectra
Yuan-Sen Ting, Charlie Conroy, Hans-Walter Rix
Stellar spectra are often modeled and fit by interpolating within a rectilinear grid of synthetic spectra to derive the stars' labels: stellar parameters and elemental abundances.…
Hierarchical Galaxy Growth and Scatter in the Stellar Mass - Halo Mass Relation
Meng Gu, Charlie Conroy, Peter Behroozi
The relation between galaxies and dark matter halos reflects the combined effects of many distinct physical processes. Observations indicate that the stellar mass-halo mass (…