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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_…
CECILIA: Multi-line Constraints on Excess Nebular Emission from Low-Ionization Gas at Cosmic Noon
Caroline von Raesfeld, Allison L. Strom, Audrey Clarendon +7
Spectroscopy from JWST has offered unique insights into elemental abundance patterns at Cosmic Noon (z~2-3), most notably a growing census of sub-solar S/O. These new measurements,…
CECILIA: Using Flexible Photoionization Models to Accurately Measure Abundances without Auroral Lines
Nathalie A. Korhonen Cuestas, Allison L. Strom, Yijia Li +6
JWST has facilitated the detection of faint, auroral emission lines needed to directly measure the electron temperature and elemental abundances in high-redshift galaxies. However,…
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…
CECILIA: The Mass-Metallicity Relation of Low-Mass Galaxies at Cosmic Noon
Menelaos Raptis, Gwen C. Rudie, Ryan F. Trainor +9
A galaxy's metallicity and its relation to stellar mass encode the history of gas accretion, star formation, and outflows within cosmic ecosystems. We present new constraints on th…
CECILIA: Gas-Phase Physical Conditions and Multi-Element Chemistry at Cosmic Noon
Noah S. J. Rogers, Allison L. Strom, Gwen C. Rudie +9
Galaxies at Cosmic Noon (z2-3) are characterized by rapid star formation that will lead to significant metal enrichment in the interstellar medium (ISM). While much observati…
CECILIA: Ultra-Deep Rest-Optical Spectra of Faint Galaxies at Cosmic Noon
Menelaos Raptis, Ryan F. Trainor, Allison L. Strom +6
Intrinsically faint galaxies at offer critical insights into early galaxy formation, tracing low-metallicity, low-mass systems during Cosmic Noon and serving as analogs…
CLASSY XII: Nitrogen Enrichment Shaped by Gas Density and Feedback
Karla Z. Arellano-Córdova, Danielle A. Berg, Matilde Mingozzi +25
We investigate the chemical evolution of N/O using a sample of 45 local star-forming galaxies (SFGs) from the CLASSY survey. This sample spans a wide range of galaxy properties, wi…
Detection of Deuterated Hydrocarbon Nanoparticles in the Whirlpool Galaxy, M51
B. T. Draine, Karin Sandstrom, Daniel A. Dale +29
Deuteration of hydrocarbon material, including polycyclic aromatic hydrocarbons (PAHs), has been proposed to account for the low gas-phase abundances of D in the interstellar mediu…
Generalized ([OIII])-(HeI) Discrepancies in Ionized Nebulae: Possible Evidence of Case B Deviations and Temperature Inhomogeneities
J. E. Méndez-Delgado, E. D. Skillman, E. Aver +11
The physics of recombination lines (RLs) in the HeI singlet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of HeI singl…
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…
CLASSY IX: The Chemical Evolution of the Ne, S, Cl, and Ar Elements
Karla Z. Arellano-Córdova, Danielle A. Berg, Matilde Mingozzi +20
To study the chemical evolution across cosmic epochs, we investigate Ne, S, Cl, and Ar abundance patterns in the COS Legacy Archive Spectroscopic SurveY (CLASSY). CLASSY comprises…
CECILIA: Direct O, N, S, and Ar Abundances in Q2343-D40, a Galaxy at 3
Noah S. J. Rogers, Allison L. Strom, Gwen C. Rudie +3
Measurements of chemical abundances in high- star-forming (SF) galaxies place important constraints on the enrichment histories of galaxies and the physical conditions in the ea…
HST UV Spectroscopy of the Dwarf Starburst Galaxy Pox 186
Noah S. J. Rogers, Claudia M. Scarlata, Evan D. Skillman +4
Studying the galaxies responsible for reionization is often conducted through local reionization-era analogs; however, many of these local analogs are too massive to be representat…
CECILIA: The Faint Emission Line Spectrum of z~2-3 Star-forming Galaxies
Allison L. Strom, Gwen C. Rudie, Ryan F. Trainor +7
We present the first results from CECILIA, a Cycle 1 JWST NIRSpec/MSA program that uses ultra-deep ~30 hour G235M/F170LP observations to target multiple electron temperature-sensit…
A Magnified Compact Galaxy at Redshift 9.51 with Strong Nebular Emission Lines
Hayley Williams, Patrick L. Kelly, Wenlei Chen +21
Ultraviolet light from early galaxies is thought to have ionized gas in the intergalactic medium. However, there are few observational constraints on this epoch because of the fain…
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…
A First Look at the Abundance Pattern -- O/H, C/O, and Ne/O -- in Galaxies with JWST/NIRSpec
Karla Z. Arellano-Córdova, Danielle A. Berg, John Chisholm +9
We analyze the rest-frame near-UV and optical nebular spectra of three galaxies from the Early Release Observations taken with the Near-Infrared Spectrograph (NIRSpec) on t…
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…
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…
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…
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…