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Orbital Clustering Identifies the Origins of Galactic Stellar Streams
Ana Bonaca, Rohan P. Naidu, Charlie Conroy +9
The origins of most stellar streams in the Milky Way are unknown. With improved proper motions provided by Gaia EDR3, we show that the orbits of 23 Galactic stellar streams are hig…
Stellar Population Inference with Prospector
Benjamin D. Johnson, Joel Leja, Charlie Conroy +1
Inference of the physical properties of stellar populations from observed photometry and spectroscopy is a key goal in the study of galaxy evolution. In recent years the quality an…
Ancient Very Metal-Poor Stars Associated With the Galactic Disk in the H3 Survey
Courtney Carter, Charlie Conroy, Dennis Zaritsky +8
Ancient, very metal-poor stars offer a window into the earliest epochs of galaxy formation and assembly. We combine data from the H3 Spectroscopic Survey and Gaia to measure metall…
Discovery of Magellanic Stellar Debris in the H3 Survey
Dennis Zaritsky, Charlie Conroy, Rohan P. Naidu +9
We report the discovery of 15 stars in the H3 survey that lie, in projection, near the tip of the trailing gaseous Magellanic Stream (MS). The stars have Galactocentric velocities…
MESA models with magnetic braking
Seth Gossage, Aaron Dotter, Cecilia Garraffo +3
Two magnetic braking models are implemented in MESA for use in the MIST stellar model grids. Stars less than about 1.3 are observed to spin down over time through inter…
Coordinated Assembly of Galaxy Groups and Clusters in the IllustrisTNG Simulations
Meng Gu, Charlie Conroy, Benedikt Diemer +6
Recent stellar population analysis of early-type galaxy spectra has demonstrated that the low-mass galaxies in cluster centers have high [] and old ages characteristic of…
The Dragonfly Wide Field Survey. II. Accurate Total Luminosities and Colors of Nearby Massive Galaxies and Implications for the Galaxy Stellar Mass Function
Tim B. Miller, Pieter van Dokkum, Shany Danieli +8
Stellar mass estimates of massive galaxies are susceptible to systematic errors in their photometry, due to their extended light profiles. In this study we use data from the Dragon…
A Diffuse Metal-Poor Component of the Sagittarius Stream Revealed by the H3 Survey
Benjamin D. Johnson, Charlie Conroy, Rohan P. Naidu +6
The tidal disruption of the Sagittarius dwarf galaxy has generated a spectacular stream of stars wrapping around the entire Galaxy. We use data from and the H3 Stellar Spect…
Spatial and Kinematic Clustering of Stars in the Galactic Disk
Harshil Kamdar, Charlie Conroy, Yuan-Sen Ting +1
The Galactic disk is expected to be spatially, kinematically, and chemically clustered on many scales due to both star formation and non-axisymmetries in the Galactic potential. In…
Brackett- as a Gold-standard Test of Star Formation Rates Derived from SED Fitting
Imad Pasha, Joel Leja, Pieter G. van Dokkum +2
Using a local reference sample of 21 galaxies, we compare observations of the 2.16 m Brackett- (Br) hydrogen recombination line with predictions from the Prospector Bay…
The Universe at z>10: Predictions for JWST from the UniverseMachine DR1
Peter Behroozi, Charlie Conroy, Risa H. Wechsler +8
The James Webb Space Telescope (JWST) is expected to observe galaxies at that are presently inaccessible. Here, we use a self-consistent empirical model, the UniverseMachine…
Powderday: Dust Radiative Transfer for Galaxy Simulations
Desika Narayanan, Matthew J. Turk, Thomas Robitaille +18
We present Powderday, a flexible, fast, open-source dust radiative transfer package designed to interface with galaxy formation simulations. Powderday builds on FSPS population syn…
Evidence from the H3 Survey that the Stellar Halo is Entirely Comprised of Substructure
Rohan P. Naidu, Charlie Conroy, Ana Bonaca +5
In the CDM paradigm the Galactic stellar halo is predicted to harbor the accreted debris of smaller systems. To identify these systems, the H3 Spectroscopic Survey, combined wit…
How Well Can We Measure the Stellar Mass of a Galaxy: The Impact of the Assumed Star Formation History Model in SED Fitting
Sidney Lower, Desika Narayanan, Joel Leja +3
The primary method for inferring the stellar mass () of a galaxy is through spectral energy distribution (SED) modeling. However, the technique rests on assumptions such as th…
Timing the Early Assembly of the Milky Way with the H3 Survey
Ana Bonaca, Charlie Conroy, Phillip A. Cargile +7
The archaeological record of stars in the Milky Way opens a uniquely detailed window into the early formation and assembly of galaxies. Here we use 11,000 main-sequence turn-off st…
Measuring Star Formation Histories, Distances, and Metallicities with Pixel Color-Magnitude Diagrams II: Applications to Nearby Elliptical Galaxies
B. A. Cook, Charlie Conroy, Pieter van Dokkum
We present spatially-resolved measurements of star formation histories (SFHs), metallicities, and distances in three nearby elliptical galaxies and the bulge of M31 derived using t…
Measuring distances to low-luminosity galaxies using surface brightness fluctuations
Johnny P. Greco, Pieter van Dokkum, Shany Danieli +2
We present an in-depth study of surface brightness fluctuations (SBFs) in low-luminosity stellar systems. Using the MIST models, we compute theoretical predictions for absolute SBF…
High-resolution spectroscopy of the GD-1 stellar stream localizes the perturber near the orbital plane of Sagittarius
Ana Bonaca, Charlie Conroy, David W. Hogg +6
The -long thin stellar stream in the Milky Way halo, GD-1, has an ensemble of features that may be due to dynamical interactions. Using high-resolution MMT/Hectochelle s…