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SPECULATOR: Emulating stellar population synthesis for fast and accurate galaxy spectra and photometry
Justin Alsing, Hiranya Peiris, Joel Leja +6
We present SPECULATOR - a fast, accurate, and flexible framework for emulating stellar population synthesis (SPS) models for predicting galaxy spectra and photometry. For emulating…
The Dragonfly Wide Field Survey. I. Telescope, Survey Design and Data Characterization
Shany Danieli, Deborah Lokhorst, Jielai Zhang +11
We present a description of the Dragonfly Wide Field Survey (DWFS), a deep photometric survey of a wide area of sky. The DWFS covers 330 in the equatorial GAMA fie…
A Tip of the Red Giant Branch Distance to the Dark Matter Deficient Galaxy NGC1052-DF4 from Deep Hubble Space Telescope Data
Shany Danieli, Pieter van Dokkum, Roberto Abraham +3
Previous studies have shown that the large, diffuse galaxies NGC1052-DF2 and NGC1052-DF4 both have populations of unusually luminous globular clusters as well as a very low dark ma…
The Dragonfly Edge-on Galaxies Survey: Shaping the outer disc of NGC 4565 via accretion
Colleen Gilhuly, David Hendel, Allison Merritt +6
We present extremely deep imaging of the well-known edge-on galaxy NGC 4565 (the "Needle Galaxy"), observed as part of the Dragonfly Edge-on Galaxies Survey. Our imaging traces sta…
A New Census of the 0.2 < z < 3.0 Universe, Part I: The Stellar Mass Function
Joel Leja, Joshua S. Speagle, Benjamin D. Johnson +3
There has been a long-standing factor-of-two tension between the observed star formation rate density and the observed stellar mass buildup after . Recently we have propose…
A Lower Limit on the Mass of Our Galaxy from the H3 Survey
Dennis Zaritsky, Charlie Conroy, Huanian Zhang +5
The timing argument provides a lower limit on the mass of the Milky Way. We find, using a sample of 32 stars at kpc drawn from the H3 Spectroscopic Survey and mock catalog…
Resolving the Metallicity Distribution of the Stellar Halo with the H3 Survey
Charlie Conroy, Rohan P. Naidu, Dennis Zaritsky +4
The Galactic stellar halo is predicted to have formed at least partially from the tidal disruption of accreted dwarf galaxies. This assembly history should be detectable in the orb…
ATLAS Probe: Breakthrough Science of Galaxy Evolution, Cosmology, Milky Way, and the Solar System
Yun Wang, Mark Dickinson, Lynne Hillenbrand +45
ATLAS (Astrophysics Telescope for Large Area Spectroscopy) is a concept for a NASA probe-class space mission. It is the spectroscopic follow-up mission to WFIRST, boosting its scie…
Mapping the Stellar Halo with the H3 Spectroscopic Survey
Charlie Conroy, Ana Bonaca, Phillip Cargile +8
Modern theories of galaxy formation predict that the Galactic stellar halo was hierarchically assembled from the accretion and disruption of smaller systems. This hierarchical asse…
SpecTel: A 10-12 meter class Spectroscopic Survey Telescope
Richard Ellis, Kyle Dawson, Joss Bland-Hawthorn +25
We recommend a conceptual design study for a spectroscopic facility in the southern hemisphere comprising a large diameter telescope, fiber system, and spectrographs collectively o…
Beyond UVJ: More Efficient Selection of Quiescent Galaxies With UV / Mid-IR Fluxes
Joel Leja, Sandro Tacchella, Charlie Conroy
The UVJ color-color diagram is a popular and efficient method to distinguish between quiescent and star-forming galaxies through their rest-frame vs. colors. Here we ex…
Stellar Metallicities and Elemental Abundance Ratios of z~1.4 Massive Quiescent Galaxies
Mariska Kriek, Sedona H. Price, Charlie Conroy +6
The chemical composition of galaxies has been measured out to z~4. However, nearly all studies beyond z~0.7 are based on strong-line emission from HII regions within star-forming g…
Rapid Reionization by the Oligarchs: The Case for Massive, UV-Bright, Star-Forming Galaxies with High Escape Fractions
Rohan P. Naidu, Sandro Tacchella, Charlotte A. Mason +3
The protagonists of cosmic reionization remain elusive. Faint star-forming galaxies are leading candidates because they are numerous and may have significant ionizing photon escape…
Combined Effects of Rotation and Age Spreads on Extended Main Sequence Turn Offs
Seth Gossage, Charlie Conroy, Aaron Dotter +10
The extended main sequence turn offs (eMSTOs) of several young to intermediate age clusters are examined in the Magellanic Clouds and the Milky Way. We explore the effects of exten…
MINESweeper: Spectrophotometric Modeling of Stars in the Gaia Era
Phillip A. Cargile, Charlie Conroy, Benjamin D. Johnson +4
We present MINESweeper, a tool to measure stellar parameters by jointly fitting observed spectra and broadband photometry to model isochrones and spectral libraries. This approach…
Multiple components of the Jhelum stellar stream
Ana Bonaca, Charlie Conroy, Adrian M. Price-Whelan +1
In simple models of the Milky Way, tidally disrupting satellites produce long and thin---nearly one-dimensional---stellar streams. Using astrometric data from the Gaia second data…
Dragonfly imaging of the galaxy NGC5907: a revised view of the iconic stellar stream
Pieter van Dokkum, Colleen Gilhuly, Ana Bonaca +6
In 2008 it was reported that the stellar stream of the edge-on spiral NGC5907 loops twice around the galaxy, enveloping it in a giant corkscrew-like structure. Here we present imag…
Self-consistent predictions for LIER-like emission lines from post-AGB stars
Nell Byler, Julianne J. Dalcanton, Charlie Conroy +4
Early type galaxies (ETGs) frequently show emission from warm ionized gas. These Low Ionization Emission Regions (LIERs) were originally attributed to a central, low-luminosity act…
All-Sky Near Infrared Space Astrometry
Barbara McArthur, David Hobbs, Erik Høg +20
Gaia is currently revolutionizing modern astronomy. However, much of the Galactic plane, center and the spiral arm regions are obscured by interstellar extinction, rendering them i…
Stars that Move Together Were Born Together
Harshil Kamdar, Charlie Conroy, Yuan-Sen Ting +3
It is challenging to reliably identify stars that were born together outside of actively star-forming regions and bound stellar systems. However, co-natal stars should be present t…
Spatially-resolved stellar kinematics of the ultra diffuse galaxy Dragonfly 44. I. Observations, kinematics, and cold dark matter halo fits
Pieter van Dokkum, Asher Wasserman, Shany Danieli +8
We present spatially-resolved stellar kinematics of the well-studied ultra diffuse galaxy (UDG) Dragonfly 44, as determined from 25.3 hrs of observations with the Keck Cosmic Web I…
Measuring Star-Formation Histories, Distances, and Metallicities with Pixel Color-Magnitude Diagrams I: Model Definition and Mock Tests
B. A. Cook, Charlie Conroy, Pieter van Dokkum +1
We present a comprehensive study of the applications of the pixel color-magnitude diagram (pCMD) technique for measuring star formation histories (SFHs) and other stellar populatio…
Does the galaxy NGC1052-DF2 falsify Milgromian dynamics?
Pavel Kroupa, Hosein Haghi, Behnam Javanmardi +6
A great challenge in present-day physics is to understand whether the observed internal dynamics of galaxies is due to dark matter matter or due to a modification of the law of gra…
Observing Galaxy Evolution in the Context of Large-Scale Structure
Mark Dickinson, Yun Wang, James Bartlett +26
Galaxies form and evolve in the context of their local and large-scale environments. Their baryonic content that we observe with imaging and spectroscopy is intimately connected to…