activity
20132026
most citedQuasars That Have Transitioned from Radio-quiet to Radio-loud on Decadal Timescales Revealed by VLASS and FIRST

95 citations · 559 across the 64 of their papers we have counts for

collaborators

65 papers

astro-ph.GA2026

Star Cluster Populations in 38 Spiral Galaxies: Evidence for Near-Universal Mass and Age Distributions from PHANGS

Rupali Chandar, Matthew R. Floyd, David A. Thilker +23

We present the largest study to date of star cluster mass and age distributions in nearby galaxies. The analysis is based on a uniformly selected catalog of over 15,000 (36,000) hu…

astro-ph.GA2026

Quantifying the decline in CO(2-1) intensity around PHANGS-HST star clusters: Constraints on molecular gas dispersal, stellar feedback, and cluster formation efficiency

Hao He, Adam K. Leroy, Erik Rosolowsky +37

We combine the largest survey of star clusters in nearby galaxies to-date, PHANGS-HST, with maps of molecular gas maps from PHANGS-ALMA to constrain the efficiency of cluster forma…

astro-ph.GA2026

Mid-Infrared Colors Vary with Galactic Environment: Contrasting Star-Forming Disks, Young Centers, and Quiescent Star-Formation Deserts

Debosmita Pathak, Karin M. Sandstrom, Adam K. Leroy +27

We present pc-resolution JWST/MIRI and NIRCam measurements of mid-infrared (mid-IR) color variations in the diffuse interstellar medium (ISM) of 71 nearby star-forming…

astro-ph.GA2026

Variations in the 3.3 m Polycyclic Aromatic Hydrocarbon Feature Across Nearby Galaxies Driven by Metallicity and Radiation Field Spectrum

Hannah B. Koziol, Karin Sandstrom, Dalya Baron +29

We use JWST NIRCam imaging to investigate the 3.3 m polycyclic aromatic hydrocarbon (PAH) feature in nearby galaxies. NIRCam observations of the 3.3 m feature are emerging as…

astro-ph.GA2026

A Multiwavelength Inventory for the Local Group L-band Survey I: Atlas and Radial Profiles of Local Group Galaxies

Cosima Eibensteiner, Adam K. Leroy, Jiayi Sun +21

Resolving atomic gas at pc physical resolution is currently feasible only for the very nearest galaxies. We combine 120 pc resolution HI data using the Karl G. Jansky…

astro-ph.SR2026

Connecting Stellar Population Surveys to Stellar Evolution with Delay-time Distributions: Application to LMC Classical Cepheids

Sumit K. Sarbadhicary

The progenitors of many stellar-origin phenomena such as supernovae, evolved giants and supergiants, planetary nebulae, AGB stars and other post-main-sequence exotica remain poorly…

astro-ph.GA2026

Dust-Embedded Star Formation: Bridging Magellanic Cloud Studies of Massive Young Stellar Objects to Nearby Spiral Galaxies

M. Jimena Rodríguez, Rémy Indebetouw, Janice C. Lee +13

We use JWST NIRCam and MIRI imaging at 2, 4, 10, and 21 um to study young, dusty compact sources in four nearby galaxies at distances of ~ 1-5Mpc (M33, NGC300, NGC7793, and NGC5068…

astro-ph.GA2026

The Structure of Molecular Gas in PHANGS-ALMA Galaxies: Cloud Spacing, Two-Point Correlation and Stacked Intensity Profiles

Hao He, Adam Leroy, Erik Rosolowsky +21

The sub-kpc scale gas structure encodes key information of giant molecular cloud (GMC) formation. Therefore, we aim for a quantitative description of molecular gas structure across…

astro-ph.GA2026

Constraining the Sub-Galactic Relationship Between Star Formation and the Hot Interstellar Medium in NGC 4254

Erik B. Monson, Bret D. Lehmer, Amirnezam Amiri +17

We investigate the relationship between star formation and X-ray emission from the hot interstellar medium (ISM) on kpc scales in NGC 4254 (M99) by combining spatially resolv…

astro-ph.GA2025

Evolved Supergiants in PHANGS I: Red Supergiants in 19 Galaxies between 5-20 Mpc with HST and JWST

Sumit K. Sarbadhicary, David Thilker, Adam K. Leroy +17

Red supergiants (RSGs) are important for our understanding of supernova progenitors, stellar populations, stellar evolution, mass loss and dust production. Extragalactic surveys of…

astro-ph.GA2025★ 3 cited

SDSS-V LVM: Resolving Physical Conditions in the Trifid Nebula

Natascha Sattler, J. Eduardo Méndez-Delgado, Kathryn Kreckel +18

The chemical abundance of the interstellar medium sets the initial conditions for star formation and provides a probe of chemical galaxy evolution models. However, unresolved inhom…

astro-ph.GA2025★ 1 cited

Ashes of Creation: JWST Uncovers Silicate Dust in Massive Star Clusters

Daniel Maschmann, Bradley C. Whitmore, David A. Thilker +35

Dust production is a fundamental aspect of the baryonic cycle of star formation. It is known that dust is injected into the interstellar medium during early star formation by super…

astro-ph.GA2025

PHANGS-JWST: the largest extragalactic molecular cloud catalog traced by polycyclic aromatic hydrocarbon emission

Z. Bazzi, D. Colombo, F. Bigiel +25

High-resolution JWST images of nearby spiral galaxies reveal polycyclic aromatic hydrocarbon (PAH) emission structures that trace molecular gas, including CO-dark regions. We ident…

astro-ph.GA2025

Resolved HII regions in NGC 253: Ionized gas structure and suggestions of a universal density-surface brightness relation

Rebecca L. McClain, Adam K. Leroy, Enrico Congiu +23

We use the full-disk VLT-MUSE mosaic of NGC 253 to identify 2492 HII regions and study their resolved structure. With an average physical resolution of 17 pc, this is one of the la…

astro-ph.GA2025★ 8 cited

The PHANGS-MUSE/HST-Halpha Nebulae Catalogue

A. T. Barnes, R. Chandar, K. Kreckel +38

We present the PHANGS-MUSE/HST-Halpha nebulae catalogue, comprising 5177 spatially resolved nebulae across 19 nearby star-forming galaxies (< 20 Mpc), based on high-resolution Halp…

astro-ph.GA2025

Masses, Star-Formation Efficiencies, and Dynamical Evolution of 18,000 HII Regions

Debosmita Pathak, Adam K. Leroy, Ashley. T. Barnes +36

We present measurements of the masses associated with HII regions across 19 nearby star-forming galaxies by combining data from JWST, HST, MUSE, ALMA, VLA, and MeerKAT…

astro-ph.GA2025★ 8 cited

Polycyclic aromatic hydrocarbons destruction in star-forming regions across 42 nearby galaxies

Oleg V. Egorov, Adam K. Leroy, Karin Sandstrom +30

Polycyclic aromatic hydrocarbons (PAHs) are widespread in the interstellar medium (ISM) of Solar metallicity galaxies, where they play a critical role in ISM heating, cooling, and…

astro-ph.GA2025

Characterization of Two Cool Galaxy Outflow Candidates Using Mid-Infrared Emission from Polycyclic Aromatic Hydrocarbons

Jessica Sutter, Karin Sandstrom, Ryan Chown +22

We characterize two candidate cool galactic outflows in two relatively low mass, highly inclined Virgo cluster galaxies: NGC4424 and NGC4694. Previous analyses of observations usin…

astro-ph.GA2025★ 4 cited

SDSS-V Local Volume Mapper (LVM): Revealing the Structure of the Rosette Nebula

Mónica A. Villa-Durango, Jorge Barrera-Ballesteros, Carlos G. Román-Zúñiga +19

The Rosette Nebula is a well-known H II region shaped by the interaction of gas with the OB stars of the NGC 2244 stellar association. Located within the remnant of a giant molecul…

astro-ph.GA2025

The Hidden Life of Stars: Embedded Beginnings to AGB Endings in the PHANGS-JWST Sample. I. Catalog of Mid-IR Sources

Hamid Hassani, Erik Rosolowsky, Adam K. Leroy +28

We present a multiwavelength catalog of mid-infrared-selected compact sources in 19 nearby galaxies, combining JWST NIRCam/MIRI, HST UV-optical broadband, H narrow-band, and ALM…

astro-ph.HE2025

SDSS-V LVM: Collisionless Shocks in the Supernova Remnant RCW86

Sumit K. Sarbadhicary, Knox S. Long, John C. Raymond +19

The supernova remnant (SNR) RCW86 is among the few SNRs with Balmer-emission lines containing broad and narrow spectral components that trace fast, non-radiative shocks in partiall…

astro-ph.GA2025★ 3 cited

The Hierarchical Dynamical State of Molecular Gas from 3 to 300 pc in NGC 253

Elias K. Oakes, Christopher M. Faesi, Erik Rosolowsky +25

Understanding how the dynamical state of the interstellar medium (ISM) changes across spatial scales can provide important insights into how the gas is organized and ultimately col…

astro-ph.GA2025★ 5 cited

Duration and properties of the embedded phase of star formation in 37 nearby galaxies from PHANGS-JWST

Lise Ramambason, Mélanie Chevance, Jaeyeon Kim +32

Light reprocessed by dust grains emitting in the infrared allows the study of the physics at play in dusty, embedded regions, where ultraviolet and optical wavelengths are attenuat…

astro-ph.GA2025★ 12 cited

The Karl G. Jansky Very Large Array Local Group L-band Survey (LGLBS)

Eric W. Koch, Adam K. Leroy, Erik W. Rosolowsky +45

We present the Local Group L-Band Survey (LGLBS), a Karl G. Jansky Very Large Array (VLA) survey producing the highest quality 21-cm and 1-2 GHz radio continuum images to date for…