294 citations · 1.4k across the 27 of their papers we have counts for
27 papers
Localized Deviations from the CO-PAH Relation in PHANGS-JWST Galaxies: Faint PAH Emission or Elevated CO Emissivity?
Jaeyeon Kim, Adam K. Leroy, Karin Sandstrom +25
Polycyclic aromatic hydrocarbon (PAH) emission is widely used to trace the distribution of molecular gas in the interstellar medium, exhibiting a tight correlation with CO(2-1) emi…
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…
Relationships between PAHs, Small Dust Grains, H, and HI in Local Group Dwarf Galaxies NGC 6822 and WLM Using JWST, ALMA, and the VLA
Ryan Chown, Adam K. Leroy, Alberto D. Bolatto +27
We present 0.7-3.3 pc resolution mid-infrared (MIR) JWST images at 7.7 m (F770W) and 21 m (F2100W) covering the main star-forming regions of two of the closest star-forming l…
CO-to-H conversion factor and grain size distribution through the analysis of - relation
I-Da Chiang, Hiroyuki Hirashita, Jeremy Chastenet +5
The CO-to-H conversion factor () is expected to vary with dust abundance and grain size distribution through the efficiency of shielding gas from CO-dissociation…
The Resolved Behavior of Dust Mass, Polycyclic Aromatic Hydrocarbon Fraction, and Radiation Field in ~ 800 Nearby Galaxies
Jérémy Chastenet, Karin M. Sandstrom, Adam K. Leroy +8
We present resolved m dust spectral energy distribution (SED) fitting for nearby galaxies. We measure the distribution of radiation field intensities heating…
PHANGS-MeerKAT and MHONGOOSE HI observations of nearby spiral galaxies: physical drivers of the molecular gas fraction,
Cosima Eibensteiner, Jiayi Sun, Frank Bigiel +36
The molecular-to-atomic gas ratio is crucial to the evolution of the interstellar medium in galaxies. We investigate the balance between the atomic () and molecular gas…
Resolved Measurements of the CO-to-H Conversion Factor in 37 Nearby Galaxies
I-Da Chiang, Karin M. Sandstrom, Jeremy Chastenet +6
We measure the CO-to-H conversion factor () in 37 galaxies at 2~kpc resolution, using dust surface density inferred from far-infrared emission as a tracer of the…
Star Formation Efficiency in Nearby Galaxies Revealed with a New CO-to-H2 Conversion Factor Prescription
Yu-Hsuan Teng, I-Da Chiang, Karin M. Sandstrom +24
Determining how galactic environment, especially the high gas densities and complex dynamics in bar-fed galaxy centers, alters the star formation efficiency (SFE) of molecular gas…
A sensitive, high-resolution, wide-field IRAM NOEMA CO(1-0) survey of the very nearby spiral galaxy IC 342
M. Querejeta, J. Pety, A. Schruba +31
We present a new wide-field 10.75 x 10.75 arcmin^2 (~11x11 kpc^2), high-resolution (theta = 3.6" ~ 60 pc) NOEMA CO(1-0) survey of the very nearby (d=3.45 Mpc) spiral galaxy IC 342.…
The Physical Drivers and Observational Tracers of CO-to-H2 Conversion Factor Variations in Nearby Barred Galaxy Centers
Yu-Hsuan Teng, Karin M. Sandstrom, Jiayi Sun +24
The CO-to-H conversion factor ($α_\rm{CO}$) is central to measuring the amount and properties of molecular gas. It is known to vary with environmental conditions, and previous…
Wide-field CO isotopologue emission and the CO-to-H factor across the nearby spiral galaxy M101
Jakob S. den Brok, Frank Bigiel, Jérémy Chastenet +18
Carbon monoxide (CO) emission is the most widely used tracer of the bulk molecular gas in the interstellar medium (ISM) in extragalactic studies. The CO-to-H conversion factor,…
Kpc-scale properties of dust temperature in terms of dust mass and star formation activity
I-Da Chiang, Hiroyuki Hirashita, Jeremy Chastenet +7
We investigate how the dust temperature is affected by local environmental quantities, especially dust surface density (), dust-to-gas ratio (D/G) and interstellar…
PHANGS-JWST First Results: Variations in PAH Fraction as a Function of ISM Phase and Metallicity
Jérémy Chastenet, Jessica Sutter, Karin Sandstrom +26
We present maps tracing the fraction of dust in the form of polycyclic aromatic hydrocarbons (PAHs) in IC 5332, NGC 628, NGC 1365, and NGC 7496 from JWST/MIRI observations. We trac…
PHANGS-JWST First Results: A Global and Moderately Resolved View of Mid-Infrared and CO Line Emission from Galaxies at the Start of the JWST Era
Adam K. Leroy, Alberto D. Bolatto, Karin Sandstrom +41
We explore the relationship between mid-infrared (mid-IR) and CO rotational line emission from massive star-forming galaxies, which is one of the tightest scalings in the local uni…
PHANGS-JWST First Results: Tracing the Diffuse ISM with JWST Imaging of Polycyclic Aromatic Hydrocarbon Emission in Nearby Galaxies
Karin M. Sandstrom, Eric W. Koch, Adam K. Leroy +43
JWST observations of polycyclic aromatic hydrocarbon (PAH) emission provide some of the deepest and highest resolution views of the cold interstellar medium (ISM) in nearby galaxie…
The PHANGS-JWST Treasury Survey: Star Formation, Feedback, and Dust Physics at High Angular resolution in Nearby GalaxieS
Janice C. Lee, Karin M. Sandstrom, Adam K. Leroy +74
The PHANGS collaboration has been building a reference dataset for the multi-scale, multi-phase study of star formation and the interstellar medium in nearby galaxies. With the suc…
Analytic models of dust temperature in high-redshift galaxies
Hiroyuki Hirashita, I-Da Chiang
We investigate physical reasons for high dust temperatures ( K) observed in some high-redshift () galaxies using analytic models. We consider two mo…
Molecular Cloud Populations in the Context of Their Host Galaxy Environments: A Multiwavelength Perspective
Jiayi Sun, Adam K. Leroy, Erik Rosolowsky +35
We present a rich, multiwavelength, multiscale database built around the PHANGS-ALMA CO(2-1) survey and ancillary data. We use this database to present the distributions of mol…
The intrinsic reddening of the Magellanic Clouds as traced by background galaxies -- III. The Large Magellanic Cloud
Cameron P. M. Bell, Maria-Rosa L. Cioni, Angus H. Wright +15
We present a map of the total intrinsic reddening across ~90 deg of the Large Magellanic Cloud (LMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energ…
Low-J CO Line Ratios From Single Dish CO Mapping Surveys and PHANGS-ALMA
Adam K. Leroy, Erik Rosolowsky, Antonio Usero +32
We measure the low-J CO line ratio R21=CO(2-1)/CO(1-0), R32=CO(3-2)/CO(2-1), and R31 = CO(3-2)/CO(1-0) using whole-disk CO maps of nearby galaxies. We draw CO(2-1) from PHANGS--ALM…
PHANGS-ALMA: Arcsecond CO(2-1) Imaging of Nearby Star-Forming Galaxies
Adam K. Leroy, Eva Schinnerer, Annie Hughes +69
We present PHANGS-ALMA, the first survey to map CO J=2-1 line emission at ~1" ~ 100pc spatial resolution from a representative sample of 90 nearby (d<~20 Mpc) galaxies that lie on…
PHANGS-ALMA Data Processing and Pipeline
Adam K. Leroy, Annie Hughes, Daizhong Liu +65
We describe the processing of the PHANGS-ALMA survey and present the PHANGS-ALMA pipeline, a public software package that processes calibrated interferometric and total power data…
Benchmarking Dust Emission Models in M101
Jeremy Chastenet, Karin Sandstrom, I-Da Chiang +7
We present a comparative study of four physical dust models and two single-temperature modified blackbody models by fitting them to the resolved WISE, Spitzer, and Herschel photome…
Dynamical Equilibrium in the Molecular ISM in 28 Nearby Star-Forming Galaxies
Jiayi Sun, Adam K. Leroy, Eve C. Ostriker +26
We compare the observed turbulent pressure in molecular gas, , to the required pressure for the interstellar gas to stay in equilibrium in the gravitational potent…