Publications (35)
Testing the Relationship Between Bursty Star Formation and Size Fluctuations of Local Dwarf Galaxies
Najmeh Emami, Brian Siana, Kareem El-Badry +7
Stellar feedback in dwarf galaxies plays a critical role in regulating star formation via galaxy-scale winds. Recent hydrodynamical zoom simulations of dwarf galaxies predict that…
Low Metallicity Galaxies from the Dark Energy Survey
Yu-Heng Lin, Claudia Scarlata, Vihang Mehta +6
We present a new selection of 358 blue compact dwarf galaxies (BCDs) from 5,000 square degrees in the Dark Energy Survey (DES), and the spectroscopic follow-up of a subsample of 68…
New BBN limits on Physics Beyond the Standard Model from He4
Richard H. Cyburt, Brian D. Fields, Keith A. Olive +1
A recent analysis of the He4 abundance determined from observations of extragalactic HII regions indicates a significantly greater uncertainty for the He4 mass fraction. The derive…
The ACS Nearby Galaxy Survey Treasury II. Young Stars and their Relation to Halpha and UV Emission Timescales in the M81 Outer Disk
Stephanie M. Gogarten, Julianne J. Dalcanton, Benjamin F. Williams +11
We have obtained resolved stellar photometry from Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) observations of a field in the outer disk of M81 as part of the ACS…
The ACS Nearby Galaxy Survey Treasury IV. The Star Formation History of NGC 2976
Benjamin F. Williams, Julianne J. Dalcanton, Adrienne Stilp +8
We present resolved stellar photometry of NGC 2976 obtained with the Advanced Camera for Surveys (ACS) as part of the ACS Nearby Galaxy Survey Treasury (ANGST) program. The data co…
Timescales on which Star Formation Affects the Neutral ISM
Adrienne M. Stilp, Julianne J. Dalcanton, Steven R. Warren +5
Turbulent neutral hydrogen (HI) line widths are often thought to be driven primarily by star formation (SF), but the timescale for converting SF energy to HI kinetic energy is uncl…
Resolved Near-Infrared Stellar Populations in Nearby Galaxies
Julianne J. Dalcanton, Benjamin F. Williams, Jason L. Melbourne +10
We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the resolved stellar populations within 26 fields of 23 nearby galaxies (<4 Mpc), based on F110W and F160W images…
Connecting Gas Dynamics and Star Formation Histories in Nearby Galaxies: The VLA-ANGST Survey
Juergen Ott, Evan Skillman, Julianne Dalcanton +5
In recent years, HST revolutionized the field of star formation in nearby galaxies. Due to its high angular resolution it has now become possible to construct star formation histor…
Mapping Gas Phase Abundances and Enrichment Patterns Across Galaxy Disks
Kathryn Kreckel, Danielle Berg, Guillermo A. Blanc +12
The distribution of gas-phase abundances in galaxy disks encodes the history of nucleosynthesis and transport through the interstellar medium (ISM) over cosmic time. Multi-object a…
The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) II. The Spatially Resolved Recent Star Formation History of M33
Margaret Lazzarini, Benjamin F. Williams, Meredith J. Durbin +11
We measure the spatially resolved recent star formation history (SFH) of M33 using optical images taken with the Hubble Space Telescope as part of the Panchromatic Hubble Andromeda…
The ACS LCID Project XI. On the early time resolution of LG dwarf galaxy SFHs: Comparing the effects of reionization in models with observations
Antonio Aparicio, Sebastian L. Hidalgo, Evan Skillman +10
The analysis of the early star formation history (SFH) of nearby galaxies, obtained from their resolved stellar populations is relevant as a test for cosmological models. However,…
Comparison of H-alpha and UV Star Formation Rates in the Local Volume: Systematic Discrepancies for Dwarf Galaxies
Janice C. Lee, Armando Gil de Paz, Christy Tremonti +14
(abridged) Using a complete sample of ~300 star-forming galaxies within 11 Mpc, we evaluate the consistency between star formation rates (SFRs) inferred from the far ultraviolet (F…
The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) I. Ultraviolet to Infrared Photometry of 22 Million Stars in M33
Benjamin F. Williams, Meredith J. Durbin, Julianne J. Dalcanton +18
We present panchromatic resolved stellar photometry for 22 million stars in the Local Group dwarf spiral Triangulum (M33), derived from Hubble Space Telescope (HST) observations wi…
The Hubble Space Telescope Survey of M31 Satellite Galaxies. III. Calibrating the Horizontal Branch as an Age Indicator for Nearby Galaxies
Connor Jennings, Alessandro Savino, Daniel Weisz +14
We present a new method for measuring the mean age of old/intermediate stellar populations in resolved, metal-poor () galaxies using only th…
The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). IV. Star Cluster Catalog
L. Clifton Johnson, Tobin M. Wainer, Estephani E. TorresVillanueva +9
We construct a catalog of star clusters from Hubble Space Telescope images of the inner disk of the Triangulum Galaxy (M33) using image classifications collected by the Local Group…
Quantification of The Age Dependence of Mid-Infrared Star Formation Rate Indicators
Daniela Calzetti, Robert C. Kennicutt, Angela Adamo +33
We combine James Webb Space Telescope images of the nearby galaxy NGC 5194 in the hydrogen recombination line Pa-alpha (lambda=1.8756 micron) from the Cycle 1 program JWST-FEAST wi…
The Primordial Abundance of He4: An Update
Keith A. Olive, Evan Skillman, Gary Steigman
We include new data in an updated analysis of helium in low metallicity extragalactic HII regions with the goal of deriving the primordial abundance of He4 (Y_P). We show that the…
The Star Formation Histories of Disk and E/S0 Galaxies from Resolved Stars
Knut A. G. Olsen, Aaron J. Romanowsky, Abhijit Saha +3
The resolved stellar populations of local galaxies, from which it is possible to derive complete star formation and chemical enrichment histories, provide an important way to study…
Constraining the Stellar Populations and Star Formation Histories of Blue Compact Dwarf Galaxies with SED Fits
Steven Janowiecki, John J. Salzer, Liese van Zee +2
We discuss and test possible evolutionary connections between Blue Compact Dwarf galaxies (BCDs) and other types of dwarf galaxies. BCDs provide ideal laboratories to study intense…
The Panchromatic Hubble Andromeda Treasury X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars
Benjamin F. Williams, Dustin Lang, Julianne J. Dalcanton +16
We have measured stellar photometry with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) in near ultraviolet (F275W, F336W), optic…
The ACS Nearby Galaxy Survey Treasury VI. The Ancient Star Forming disk of NGC 404
Benjamin F. Williams, Julianne J. Dalcanton, Karoline M. Gilbert +5
We present HST/WFPC2 observations across the disk of the nearby isolated dwarf S0 galaxy NGC 404, which hosts an extended gas disk. Our deepest field reaches the red clump and main…
Panchromatic Hubble Andromeda Treasury. XIX. The Ancient Star Formation History of the M31 Disk
Benjamin F. Williams, Andrew E. Dolphin, Julianne J. Dalcanton +7
We map the star formation history across M31 by fitting stellar evolution models to color-magnitude diagrams of each 8383 (0.31.4 kpc, deprojected) region o…
The Panchromatic Hubble Andromeda Treasury. Progression of Large-Scale Star Formation across Space and Time in M31
Dimitrios A. Gouliermis, Lori C. Beerman, Luciana Bianchi +11
We investigate the clustering of early-type stars younger than 300 Myr on galactic scales in M31. Based on the stellar photometric catalogs of the Panchromatic Hubble Andromeda Tre…
A Global Star Forming Episode in M31 2-4 Gyr Ago
Benjamin F. Williams, Julianne J. Dalcanton, Andrew E. Dolphin +9
We have identified a major global enhancement of star formation in the inner M31 disk that occurred between 2-4 Gyr ago, producing 60% of the stellar mass formed in the past…
A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A
Maude Gull, Daniel R. Weisz, Peter Senchyna +17
We characterize massive stars (M>8 M_sun) in the nearby (D~0.8 Mpc) extremely metal-poor (Z~5% Z_sun) galaxy Leo A using Hubble Space Telescope ultra-violet (UV), optical, and near…
On the triggering of extreme starburst events in low-metallicity galaxies: a deep search for companions of Green Peas
Lauren Laufman, Claudia Scarlata, Matthew Hayes +1
Green pea galaxies are starbursting, low-mass galaxies that are good analogues to star-forming galaxies in the early universe. We perform a survey of 23 Green Peas using the MUSE I…
A GALEX Ultraviolet Imaging Survey of Galaxies in the Local Volume
Janice C. Lee, Armando Gil de Paz, Robert C. Kennicutt +9
We present results from a GALEX ultraviolet (UV) survey of a complete sample of 390 galaxies within ~11 Mpc of the Milky Way. The UV data are a key component of the composite Local…
The ACS Nearby Galaxy Survey Treasury V. Radial Star Formation History of NGC 300
Stephanie M. Gogarten, Julianne J. Dalcanton, Benjamin F. Williams +13
We present new Hubble Space Telescope (HST) observations of NGC 300 taken as part of the ACS Nearby Galaxy Survey Treasury (ANGST). Individual stars are resolved in these images do…
Global HI Kinematics in Dwarf Galaxies
Adrienne M. Stilp, Julianne J. Dalcanton, Steven R. Warren +3
HI line widths are typically interpreted as a measure of ISM turbulence, which is potentially driven by star formation. In an effort to better understand the possible connections b…
The ACS LCID project. V. The Star Formation History of the Dwarf Galaxy \objectname[]{LGS-3}: Clues for Cosmic Reionization and Feedback
Sebastian L. Hidalgo, Antonio Aparicio, Evan Skillman +11
We present an analysis of the star formation history (SFH) of the transition-type (dIrr/dSph) Local Group galaxy \objectname[]{LGS-3} (Pisces) based on deep photometry obtained wit…
An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS), I. Overview
Martha L. Boyer, Kristen B. W. McQuinn, Pauline Barmby +13
Nearby resolved dwarf galaxies provide excellent opportunities for studying the dust-producing late stages of stellar evolution over a wide range of metallicity (-2.7 < [Fe/H] < -1…
The History of Star Formation in Galaxy Disks in the Local Volume as Measured by the ACS Nearby Galaxy Survey Treasury
Benjamin F. Williams, Julianne J. Dalcanton, L. C. Johnson +9
We present a measurement of the age distribution of stars residing in spiral disks and dwarf galaxies. We derive a complete star formation history of the ~140 Mpc^3 covered by the…
The ACS Nearby Galaxy Survey Treasury IX. Constraining asymptotic giant branch evolution with old metal-poor galaxies
Leo Girardi, Benjamin F. Williams, Karoline M. Gilbert +10
In an attempt to constrain evolutionary models of the asymptotic giant branch (AGB) phase at the limit of low masses and low metallicities, we have examined the luminosity function…
The Panchromatic Hubble Andromeda Treasury XXI. The Legacy Resolved Stellar Photometry Catalog
Benjamin F. Williams, Meredith Durbin, Dustin Lang +14
We present the final legacy version of stellar photometry for the Panchromatic Hubble Andromeda Treasury (PHAT) survey. We have reprocessed all of the Hubble Space Telescope (HST)…
The ACS Nearby Galaxy Survey Treasury I. The Star Formation History of the M81 Outer Disk
Benjamin F. Williams, Julianne J. Dalcanton, Anil C. Seth +16
The ACS Nearby Galaxy Survey Treasury (ANGST) is a large Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) treasury program to obtain resolved stellar photometry for a…