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An Older, More Quiescent Universe from Panchromatic SED Fitting of the 3D-HST Survey
Joel Leja, Benjamin D. Johnson, Charlie Conroy +8
Galaxy observations are influenced by many physical parameters: stellar masses, star formation rates (SFRs), star formation histories (SFHs), metallicities, dust, black hole activi…
1D Kinematics from stars and ionized gas at from the LEGA-C spectroscopic survey of massive galaxies
Rachel Bezanson, Arjen van der Wel, Caroline Straatman +14
We present a comparison of the observed, spatially integrated stellar and ionized gas velocity dispersions of massive () galaxies…
How to Measure Galaxy Star Formation Histories II: Nonparametric Models
Joel Leja, Adam C. Carnall, Benjamin D. Johnson +2
Nonparametric star formation histories (SFHs) have long promised to be the `gold standard' for galaxy spectral energy distribution (SED) modeling as they are flexible enough to des…
How to measure galaxy star-formation histories I: Parametric models
A. C. Carnall, J. Leja, B. D. Johnson +3
Parametric models for galaxy star-formation histories (SFHs) are widely used, though they are known to impose strong priors on physical parameters. This has consequences for measur…
The Spur and the Gap in GD-1: Dynamical evidence for a dark substructure in the Milky Way halo
Ana Bonaca, David W. Hogg, Adrian M. Price-Whelan +1
We present a model for the interaction of the GD-1 stellar stream with a massive perturber that naturally explains many of the observed stream features, including a gap and an off-…
ZFOURGE: Extreme 5007 emission may be a common early-lifetime phase for star-forming galaxies at
Jonathan H. Cohn, Joel Leja, Kim-Vy H. Tran +12
Using the \prospector\ spectral energy distribution (SED) fitting code, we analyze the properties of 19 Extreme Emission Line Galaxies (EELGs) identified in the bluest composite SE…
Spectroscopic Constraints on the Build-up of the Intracluster Light in the Coma Cluster
Meng Gu, Charlie Conroy, David Law +13
The stellar content of the intracluster light (ICL) provides unique insight into the hierarchical assembly process of galaxy clusters.However, the ICL is difficult to study due to…
Ruprecht 106: A riddle, wrapped in a mystery, inside an enigma
Aaron Dotter, Antonino P. Milone, Charlie Conroy +2
Galactic globular clusters (GCs) show overwhelming photometric and spectroscopic evidence for the existence of multiple stellar populations. The question of whether or not there ex…
A Comparison of Stellar and Gas-Phase Chemical Abundances in Dusty Early-Type Galaxies
Emily Griffith, Paul Martini, Charlie Conroy
While we observe a large amount of cold interstellar gas and dust in a subset of the early-type galaxy (ETG) population, the source of this material remains unclear. The two main,…
The Distance of the Dark Matter Deficient Galaxy NGC1052-DF2
Pieter van Dokkum, Shany Danieli, Yotam Cohen +2
We recently inferred that the galaxy NGC1052-DF2 has little or no dark matter and a rich system of unusual globular clusters. We assumed that the galaxy is a satellite of the lumin…
A Deficit of Dark Matter from Jeans Modeling of the Ultra-diffuse Galaxy NGC 1052-DF2
Asher Wasserman, Aaron J. Romanowsky, Jean Brodie +5
The discovery of the ultra-diffuse galaxy NGC 1052-DF2 and its peculiar population of star clusters has raised new questions about the connections between galaxies and dark matter…
The Dragonfly Nearby Galaxies Survey. V. HST/ACS Observations of 23 Low Surface Brightness Objects in the Fields of NGC1052, NGC1084, M96, and NGC4258
Yotam Cohen, Pieter van Dokkum, Shany Danieli +8
We present HST/ACS imaging of twenty-three very low surface brightness (=25-27.5) galaxies detected in the fields of four nearby galaxy groups. These objects were selected…
Star Cluster Ages in the Gaia Era
Jieun Choi, Charlie Conroy, Yuan-Sen Ting +3
We use the framework developed as part of the MESA Isochrones and Stellar Tracks (MIST) project to assess the utility of several types of observables in jointly measuring the age a…
They Might Be Giants: An Efficient Color-Based Selection of Red Giant Stars
Charlie Conroy, Ana Bonaca, Rohan P. Naidu +4
We present a color-based method for identifying red giants based on Pan-STARRS grz and WISE W1 and W2 photometry. We utilize a subsample of bright stars with precise parallaxes fro…
The initial mass function in the Coma Berenices dwarf galaxy from deep near-infrared HST observations
Mario Gennaro, Marla Geha, Kirill Tchernyshyov +6
We use deep WFC3/IR imaging to study the Initial Mass Function (IMF) of the ultra faint dwarf galaxy Coma Berenices (Com Ber). Our observations reach the lowest stellar mass…
A Revised Velocity for the Globular Cluster GC-98 in the Ultra Diffuse Galaxy NGC1052-DF2
Pieter van Dokkum, Yotam Cohen, Shany Danieli +9
We recently published velocity measurements of luminous globular clusters in the galaxy NGC1052-DF2, concluding that it lies far off the canonical stellar mass - halo mass relation…
UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
Peter Behroozi, Risa Wechsler, Andrew Hearin +1
We present a method to flexibly and self-consistently determine individual galaxies' star formation rates (SFRs) from their host haloes' potential well depths, assembly histories,…
A redshift-independent efficiency model: star formation and stellar masses in dark matter halos at z>4
Sandro Tacchella, Sownak Bose, Charlie Conroy +2
We explore the connection between the UV luminosity functions (LFs) of high- galaxies and the distribution of stellar masses and star-formation histories (SFHs) in their host da…
A Theory for the Variation of Dust Attenuation Laws in Galaxies
Desika Narayanan, Charlie Conroy, Romeel Dave +2
In this paper, we provide a physical model for the origin of variations in the shapes and bump strengths of dust attenuation laws in galaxies by combining a large suite of cosmolog…
On the Red Giant Branch: Ambiguity in the Surface Boundary Condition Leads to ~100 K Uncertainty in Model Effective Temperatures
Jieun Choi, Aaron Dotter, Charlie Conroy +1
The effective temperature (Teff) distribution of stellar evolution models along the red giant branch (RGB) is sensitive to a number of parameters including the overall metallicity,…
Coordinated Assembly of Brightest Cluster Galaxies
Meng Gu, Charlie Conroy, Gabriel Brammer
Brightest Cluster Galaxies (BCGs) in massive dark matter halos are shaped by complex merging processes. We present a detailed stellar population analysis in the central region of A…
The Maybe Stream: A Possible Cold Stellar Stream in the Ultra-Diffuse Galaxy NGC1052-DF2
Roberto Abraham, Shany Danieli, Pieter van Dokkum +10
We report tentative evidence for a cold stellar stream in the ultra-diffuse galaxy NGC1052-DF2. If confirmed, this stream (which we refer to as "The Maybe Stream") would be the fir…
Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
Seth Gossage, Charlie Conroy, Aaron Dotter +4
The Hyades, Praesepe, and Pleiades are well studied stellar clusters that anchor important secondary stellar age indicators. Recent studies have shown that main sequence turn off-b…
A Complete Census of Luminous Stellar Variability on Day to Decade Timescales
Charlie Conroy, Jay Strader, Pieter van Dokkum +6
Stellar photometric variability offers a novel probe of the interior structure and evolutionary state of stars. Here we present a census of stellar variability on day to decade tim…