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The LBT Y Project VI: Gas-Phase Chemical Abundance Patterns of Metal-Poor Nebulae
Noah S. J. Rogers, Evan D. Skillman, Richard W. Pogge +7
Through a combined rest-optical and NIR observing campaign, the Large Binocular Telescope Primordial He Abundance () Project has delivered a precision measurement of $Y_…
The First Empirical Calibration of the MIR Abundance Diagnostic Ne with JWST
Noah S. J. Rogers, Evan D. Skillman, Danielle A. Berg +10
Large surveys of galaxies in the local and high-redshift Universe have, traditionally, relied on the intensity of rest-optical emission lines from metal ions in the Interstellar Me…
The LBT Project III: LUCI Spectra of Metal-Poor Nebulae
Miqaela K. Weller, Richard W. Pogge, Evan D. Skillman +6
Accurately determining the elemental abundances of a low metallicity nebula strongly depends on measuring the density (n) and temperature (T) of the gas. Because these two…
The LBT Project II: MODS Spectra, Physical Conditions, and Oxygen Abundances in Local Metal-Poor Nebulae
Noah S. J. Rogers, Evan D. Skillman, Richard W. Pogge +7
Empirically measuring the primordial He mass fraction, , requires a significant number of low-metallicity nebulae with direct constraints on He/H and O/H abundances. Thi…
The LBT Satellites of Nearby Galaxies Survey (LBT-SONG): The Diffuse Satellite Population of Local Volume Hosts
A. Bianca Davis, Christopher T. Garling, Anna M. Nierenberg +9
We present the results of the Large Binocular Telescope Satellites Of Nearby Galaxies Survey (LBT-SONG) ``Far Sample,'' including survey completeness estimates. We find 10 satellit…
Analysis of the full Spitzer microlensing sample I: Dark remnant candidates and Gaia predictions
Krzysztof A. Rybicki, Yossi Shvartzvald, Jennifer C. Yee +70
In the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of microlensing events observed by the Spitzer Space Teles…
CHAOS VIII: Far-Ultraviolet Spectra of M101 and The Impact of Wolf-Rayet Stars
Danielle A. Berg, Evan D. Skillman, John Chisholm +8
We investigate the stellar and nebular properties of 9 H II regions in the spiral galaxy M101 with far-ultraviolet (FUV; ~900-2000 Å) and optical (~3200-10000 Å) spectra. We detect…
AGN STORM 2: II. Ultraviolet Observations of Mrk817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope
Y. Homayouni, Gisella De Rosa, Rachel Plesha +62
We present reverberation mapping measurements for the prominent ultraviolet broad emission lines of the active galactic nucleus Mrk817 using 165 spectra obtained with the Cosmic Or…
The Eighteenth Data Release of the Sloan Digital Sky Surveys: Targeting and First Spectra from SDSS-V
Andrés Almeida, Scott F. Anderson, Maria Argudo-Fernández +151
The eighteenth data release of the Sloan Digital Sky Surveys (SDSS) is the first one for SDSS-V, the fifth generation of the survey. SDSS-V comprises three primary scientific progr…
CHAOS VII: A Large-Scale Direct Abundance Study in M33
Noah S. J. Rogers, Evan D. Skillman, Richard W. Pogge +5
The dispersion in chemical abundances provides a very strong constraint on the processes that drive the chemical enrichment of galaxies. Due to its proximity, the spiral galaxy M33…
CLASSY V: The impact of aperture effects on the inferred nebular properties of local star-forming galaxies
Karla Z. Arellano-Córdova, Matilde Mingozzi, Danielle A. Berg +23
Strong nebular emission lines are an important diagnostic tool for tracing the evolution of star-forming galaxies across cosmic time. However, different observational setups can af…
CLASSY II: A technical Overview of the COS Legacy Archive Spectroscopic SurveY
Bethan L. James, Danielle A. Berg, Teagan King +45
The COS Legacy Archive Spectroscopic SurveY (CLASSY) is designed to provide the community with a spectral atlas of 45 nearby star-forming galaxies which were chosen to cover simila…
The COS Legacy Archive Spectroscopy SurveY (CLASSY) Treasury Atlas
Danielle A. Berg, Bethan L. James, Teagan King +46
Far-ultraviolet (FUV; ~1200-2000 angstroms) spectra are fundamental to our understanding of star-forming galaxies, providing a unique window on massive stellar populations, chemica…
Direct Far-Infrared Metal Abundances (FIRA) I: M101
C. Lamarche, J. D. Smith, K. Kreckel +12
Accurately determining gas-phase metal-abundances within galaxies is critical as metals strongly affect the physics of the interstellar medium (ISM). To date, the vast majority of…
Single-lens mass measurement in the high-magnification microlensing event Gaia19bld located in the Galactic disc
K. A. Rybicki, Ł. Wyrzykowski, E. Bachelet +66
We present the photometric analysis of Gaia19bld, a high-magnification () microlensing event located in the southern Galactic plane, which exhibited finite source and m…
Characterizing Extreme Emission Line Galaxies II: A Self-Consistent Model of Their Ionizing Spectrum
Grace M. Olivier, Danielle A. Berg, John Chisholm +3
Observations of high-redshift galaxies ( 5) have shown that these galaxies have extreme emission lines with equivalent widths much larger than their local star-forming counter…
A comprehensive chemical abundance analysis of the extremely metal poor Leoncino Dwarf galaxy (AGC 198691)
Erik Aver, Danielle A. Berg, Alec S. Hirschauer +5
We re-examine the extremely metal-poor (XMP) dwarf galaxy AGC 198691 using a high quality spectrum obtained by the LBT's MODS instrument. Previous spectral observations obtained fr…
Characterizing Extreme Emission Line Galaxies I: A Four-Zone Ionization Model for Very-High-Ionization Emission
Danielle A. Berg, John Chisholm, Dawn K. Erb +3
Stellar population models produce radiation fields that ionize oxygen up to O+2, defining the limit of standard HII region models (<54.9 eV). Yet, some extreme emission line galaxi…
CHAOS VI: Direct Abundances in NGC 2403
Noah S. J. Rogers, Evan D. Skillman, Richard W. Pogge +4
We report the direct abundances for the galaxy NGC 2403 as observed by the CHemical Abundances Of Spirals (CHAOS) project. Using the Multi-Object Double Spectrograph on the Large B…
The Cepheid Distance to the Narrow-Line Seyfert 1 Galaxy NGC 4051
Wenlong Yuan, Lucas M. Macri, Bradley M. Peterson +15
We derive a distance of ~Mpc (~mag) to the archetypal narrow-line Seyfert 1 galaxy NGC 4051 based on Cepheid Period--Luminosity relations and new…
Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548
P. R. Williams, A. Pancoast, T. Treu +155
We present geometric and dynamical modeling of the broad line region for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photo…
The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151
Wenlong Yuan, Michael M. Fausnaugh, Samantha L. Hoffmann +15
We derive a distance of Mpc to the archetypical Seyfert 1 galaxy NGC 4151 based on the near-infrared Cepheid Period-Luminosity relation and new Hubble Space Telescope…
The Sloan Digital Sky Survey Reverberation Mapping Project: Estimating Masses of Black Holes in Quasars with Single-Epoch Spectroscopy
Elena Dalla Bonta`, Bradley M. Peterson, Misty C. Bentz +19
It is well known that reverberation mapping of active galactic nuclei (AGN) reveals a relationship between AGN luminosity and the size of the broad-line region, and that use of thi…
Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind characteristics and contributions to the very broad emission lines of NGC 5548
M. Dehghanian, G. J. Ferland, G. A. Kriss +22
In 2014 the NGC 5548 Space Telescope and Optical Reverberation Mapping campaign discovered a two-month anomaly when variations in the absorption and emission lines decorrelated fro…