John Chisholm

Resonantly Scattered CIV Emission in Local Star-forming Galaxies: Radiative Transfer Constraints on High-ionization Gas in Reionization Analogs

Zhihui Li, Danielle A. Berg, Simon Gazagnes +4

Rest-frame ultraviolet emission lines are diagnostics of hard ionizing spectra and highly ionized gas in galaxies resembling the sources of cosmic reionization. Nebular CIV emissio…

GLOW II: A Census of Oxygen in Low-Mass Galaxies

Kristen B. W. McQuinn, O. Grace Telford, Andrey V. Kravtsov +12

Oxygen is forged by stars and redistributed through galaxies by feedback-driven outflows, leaving a record of star formation and the baryon cycle imprinted on its present-day abund…

CLASSY. XV. Kinematics and Spatial Distributions of Outflows in Local Highly Star-Forming Galaxies

Mason S. Huberty, Cody A. Carr, Claudia Scarlata +17

Star-forming galaxies drive massive outflows that play an important role in galaxy evolution by regulating feedback and influencing the dynamics of surrounding media. Measuring gal…

A Glimpse of the Low-Mass End of the Direct Mass-Metallicity Relation at $z \sim 6 - 8$

Tiger Yu-Yang Hsiao, John Chisholm, Danielle A. Berg +22

The competition between metal synthesis and feedback from massive stars establishes the mass-metallicity relation (MZR) at low-redshifts. Examining this relation at higher redshift…

THRILS -- The High-(Redshift+Ionization) Line Search: Program Description & Redshift Catalog

Taylor A. Hutchison, Rebecca L. Larson, Pablo Arrabal Haro +46

To date, many spectroscopic confirmations of z>7 galaxies have been obtained using JWST/NIRSpec prism observations, with most of their physical properties inferred from these obser…

CLASSY XIV: The Nitrogen Exception -- Multi-Phase Enrichment and Feedback in High- $z$ Analogs

Bethan L. James, Valentina Abril-Melgarejo, Karla Z. Arellano-Córdova +13

We present a first-of-its-kind analysis of the metal content across two interstellar medium (ISM) phases in a sample of 31 local star-forming galaxies from the COS Legacy Archive S…

CLASSY XIII. Cutting through the Clouds - Comparing Indirect Tracers of Ionizing Photon Escape

Kaelee S. Parker, Danielle A. Berg, John Chisholm +25

The Epoch of Reionization (EoR) provides critical insights into the role of early galaxies in shaping the ionization state of the universe. However, because of the opacity of the i…

astro-ph.GA2025★ 2 cited

JWST/MIRI-MRS view of the metal-poor galaxy CGCG 007-025: the spatial location of PAHs and very highly ionized gas

Macarena G. del Valle-Espinosa, Matilde Mingozzi, Bethan James +16

Polycyclic Aromatic Hydrocarbons (PAHs) are key diagnostics of the physical conditions in the interstellar medium and are widely used to trace star formation in the mid-infrared (m…

Discovery of Multiply Ionized Iron Emission Powered by an Active Galactic Nucleus in a z~7 Little Red Dot

Erini Lambrides, Rebecca Larson, Taylor Hutchison +50

Some of the most puzzling discoveries of NASA's JWST in the early Universe surround the surprising abundance of compact red sources, which show peculiar continuum shapes and broad…

Intergalactic Medium Tomography with the Sunburst Arc

Michelle A. Berg, John Chisholm, J. Xavier Prochaska +9

Gravitational lensing has transformed the field of gas tomography in the intergalactic medium (IGM) and circumgalactic medium (CGM). Here we use the brightest lensed galaxy identif…

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…

astro-ph.GA2025★ 3 cited

Tentative detection of neutral gas in a Little Red Dot at $z = 4.46$

Hollis B. Akins, Caitlin M. Casey, John Chisholm +7

JWST has revealed a population of broad-line active galactic nuclei at $z > 4$ with remarkably red colors, so-called "Little Red Dots." Ubiquitous Balmer breaks suggest that they har…

astro-ph.GA2025★ 8 cited

Exploring the mysterious high-ionization source powering [Ne V] in high-z analog SBS0335-052 E with JWST/MIRI

Matilde Mingozzi, Macarena Garcia Del Valle-Espinosa, Bethan L. James +19

Nearby blue compact dwarf galaxies (BCDs) share similar properties with objects from the Epoch of Reionization revealed by JWST, in terms of low stellar mass, low metallicity and h…

Strong rest-UV emission lines in a "little red dot" AGN at $z = 7$ : Early SMBH growth alongside compact massive star formation?

Hollis B. Akins, Caitlin M. Casey, Danielle A. Berg +11

JWST has now revealed a population of broad-line AGN at $z > 4$ characterized by a distinctive SED shape, with very red rest-frame optical and very blue rest-frame UV continuum. Whil…

CLASSY XI: Tracing Neutral Gas Properties using UV Absorption Lines and 21-cm Observations

Kaelee S. Parker, Danielle A. Berg, Simon Gazagnes +15

Rest-frame far-ultraviolet (FUV) observations from JWST are revolutionizing our understanding of the high-z galaxies that drove reionization and the mechanisms by which they accomp…

The Effect of Radiation and Supernovae Feedback on LyC Escape in Local Star-forming Galaxies

Cody A. Carr, Renyue Cen, Claudia Scarlata +25

Feedback is widely recognized as an essential condition for Lyman continuum (LyC) escape in star-forming galaxies. However, the mechanisms by which galactic outflows clear neutral…

astro-ph.HE2024★ 11 cited

Shining a Light on the Connections between Galactic Outflows Seen in Absorption and Emission Lines

Xinfeng Xu, Alaina Henry, Timothy Heckman +14

Galactic outflows provide important feedback effects to regulate the evolution of host galaxies. Two primary diagnostics of outflows are broad and/or blueshifted emission and absor…

The case for super-Eddington accretion in JWST broad-line AGN during the first billion years

Erini Lambrides, Rebecca Larson, Kristen Garofali +23

A multitude of JWST studies reveal a surprising over-abundance of over-massive accreting super-massive black holes (SMBHs) -- leading to a deepening tension between theory and obse…

First direct carbon abundance measured at $z > 10$ in the lensed galaxy MACS0647 $-$ JD

Tiger Yu-Yang Hsiao, Michael W. Topping, Dan Coe +7

Investigating the metal enrichment in the early universe helps us constrain theories about the first stars and study the ages of galaxies. The lensed galaxy MACS0647 $-$ JD at $z=10.…

astro-ph.SR2024★ 1 cited

Observations of Extremely Metal-Poor O Stars: Weak Winds and Constraints for Evolution Models

O. Grace Telford, John Chisholm, Andreas A. C. Sander +3

Metal-poor massive stars drive the evolution of low-mass galaxies, both locally and at high redshift. However, quantifying the feedback they impart to their local surroundings rema…

CLASSY X: Highlighting Differences Between Partial Covering and Semi-Analytic Modeling in the Estimate of Galactic Outflow Properties

M. Huberty, C. Carr, C. Scarlata +17

Feedback driven massive outflows play a crucial role in galaxy evolution by regulating star formation and influencing the dynamics of surrounding media. Extracting outflow properti…

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…