Publications (64)
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,…
A high-dispersion molecular gas component in nearby galaxies
Anahi Caldu-Primo, Andreas Schruba, Fabian Walter +5
We present a comprehensive study of the velocity dispersion of the atomic (HI) and molecular (H2) gas components in the disks (R < R25) of a sample of 12 nearby spiral galaxies wit…
A 260 pc resolution ALMA map of HCN(1-0) in the galaxy NGC 4321
Lukas Neumann, Frank Bigiel, Ashley T. Barnes +24
The star formation rate (SFR) is tightly connected to the amount of dense gas in molecular clouds. However, it is not fully understood how the relationship between dense molecular…
Stellar feedback in M83 as observed with MUSE -- I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas
Lorenza Della Bruna, Angela Adamo, Philippe Amram +14
We present a large VLT/MUSE mosaic (3.8 x 3.8 kpc) of the nearby spiral galaxy M83, with a spatial resolution ~20 pc. We obtained the kinematics of the stars and ionised gas, and c…
ALMA Resolves 30 Doradus: Sub-parsec Molecular Cloud Structure Near the Closest Super-Star Cluster
Remy Indebetouw, Crystal Brogan, C. -H. Rosie Chen +15
We present ALMA observations of 30 Doradus -- the highest resolution view of molecular gas in an extragalactic star formation region to date (~0.4pc x 0.6pc). The 30Dor-10 cloud no…
Molecular Gas in Nearby Dwarf Galaxies: Single Dish and Interferometric Results
Alberto D. Bolatto, Adam Leroy, Josh D. Simon +2
We present results from an extensive survey of molecular gas in nearby dwarf galaxies. This survey consists of a single-dish search for CO emission at the UASO Kitt Peak 12m telesc…
The Line Ratio from 100 Molecular Clouds in the Large Magellanic Cloud
Dia Kalra, Erik Rosolowsky, Adam Leroy +1
We analyze the line ratio of the CO (2-1) to CO (2-1) rotational transitions observed from new ALMA observations of 100 Giant Molecular Clouds (GMCs) that span the La…
High-Resolution Measurements of the Dark Matter Halo of NGC 2976: Evidence for a Shallow Density Profile
Joshua D. Simon, Alberto D. Bolatto, Adam Leroy +1
We have obtained two-dimensional velocity fields of the dwarf spiral galaxy NGC 2976 in Halpha and CO. The high spatial (~75 pc) and spectral (13 km/s and 2 km/s, respectively) res…
The Low CO Content of the Extremely Metal Poor Galaxy I Zw 18
Adam Leroy, John Cannon, Fabian Walter +2
We present sensitive molecular line observations of the metal-poor blue compact dwarf I Zw 18 obtained with the IRAM Plateau de Bure interferometer. These data constrain the CO J=1…
The Gas-Star Formation Cycle in Nearby Star-Forming Galaxies I. Assessment of Multi-scale Variations
Eva Schinnerer, Annie Hughes, Adam Leroy +21
The processes regulating star formation in galaxies are thought to act across a hierarchy of spatial scales. To connect extragalactic star formation relations from global and kpc-s…
Dark Matter in Dwarf Galaxies: High Resolution Observations
Alberto D. Bolatto, Joshua D. Simon, Adam Leroy +1
We present observations and analysis of rotation curves and dark matter halo density profiles in the central regions of four nearby dwarf galaxies. This observing program has been…
The Molecular ISM of Dwarf Galaxies on Kiloparsec Scales: A New Survey for CO in Northern, IRAS-detected Dwarf Galaxies
Adam Leroy, Alberto D. Bolatto, Joshua D. Simon +1
We present a new survey for CO in dwarf galaxies using the Kitt Peak 12m telescope. We observed the central regions of 121 northern dwarfs with IRAS detections and no known CO emis…
Giant Molecular Clouds in Local Group Galaxies
Leo Blitz, Yasuo Fukui, Akiko Kawamura +3
We present the first comparative study of extragalactic GMCs using complete data sets for entire galaxies and a uniform set of reduction and analysis techniques. We present results…
Stars Born in the Wind: M82's Outflow and Halo Star Formation
Vaishnav V. Rao, Adam Smercina, Eric F. Bell +8
Starburst galaxies, like M82, launch kiloparsec-scale galactic outflows that interact with the circumgalactic medium (CGM) in complex ways. Apart from enriching the CGM with metals…
Detection of an OH 1665-MHz Maser in M33
Eric Koch, Erik Rosolowsky, Megan C. Johnson +2
We report one OH 1665-MHz detection in new observations with the NSF's Karl G. Jansky Very Large Array. To the authors' knowledge, this is the first OH maser detection in M33. The…
A steep mass transition for bar-driven ISM structuring revealed by PHANGS-JWST
Eric Emsellem, Jessica Sutter, Ryan Chown +26
Galactic bars play a critical role in the secular evolution of their hosts by reorganising the ISM. We use a sample of 57 star-forming disc galaxies observed with JWST at 3 and 7.7…
The heating of dust by old stellar populations in the Bulge of M31
Brent Groves, Oliver Krause, Karin Sandstrom +9
We use new Herschel multi-band imaging of the Andromeda galaxy to analyze how dust heating occurs in the central regions of galaxy spheroids that are essentially devoid of young st…
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…
Pa, H, and Attenuation in NGC 5194 and NGC 6946
Sarah Kessler, Adam Leroy, Miguel Querejeta +5
We combine Hubble Space Telescope (HST) Paschen (Pa) imaging with ground-based, previously published H maps to estimate the attenuation affecting H, A(H), acro…
Spatially extended and high-velocity dispersion molecular component in spiral galaxies: single-dish vs. interferometric observations
Anahi Caldu-Primo, Andreas Schruba, Fabian Walter +3
Recent studies of the molecular medium in nearby galaxies have provided mounting evidence that the molecular gas can exist in two phases: one that is clumpy and organized as molecu…
Key Science Goals for the Next Generation Very Large Array (ngVLA): Update from the ngVLA Science Advisory Council (2024)
David J. Wilner, Brenda C. Matthews, Brett McGuire +32
In 2017, the next generation Very Large Array (ngVLA) Science Advisory Council, together with the international astronomy community, developed a set of five Key Science Goals (KSGs…
Andromeda's Dust
B. T. Draine, G. Aniano, Oliver Krause +10
Spitzer Space Telescope and Herschel Space Observatory imaging of M31 is used, with a physical dust model, to construct maps of dust surface density, dust-to-gas ratio, starlight h…
Relationship between the Line Width of the Atomic and Molecular ISM in M33
Eric W. Koch, Erik W. Rosolowsky, Andreas Schruba +5
We investigate how the spectral properties of atomic (HI) and molecular (H) gas, traced by CO(2-1), are related in M33 on pc scales. We find the HI and CO(2-1) velocity at…
Giant molecular clouds in the non-grand design spiral galaxy NGC 6946
David Rebolledo, Tony Wong, Adam Leroy +2
We present high spatial resolution observations of Giant Molecular Clouds (GMCs) in the eastern part of the nearby spiral galaxy NGC 6946 obtained with the Combined Array for Resea…
NOEMA High Fidelity Imaging of the Molecular Gas in and around M82
Nico Krieger, Fabian Walter, Alberto D. Bolatto +11
We present a 154 pointing IRAM NOEMA mosaic of the CO(1-0) line emission in and around the nearby starburst galaxy M82. The observations, complemented by zero--spacing observations…
Scaling relations of the properties for CO resolved structures in nearby spiral galaxies
David Rebolledo, Tony Wong, Rui Xue +3
We report high spatial resolution observations of Giant Molecular Clouds (GMCs) in the nearby spiral galaxies NGC 6946, M101 and NGC 628 obtained with the CARMA telescope. We obser…
ALMA Observations of the Antennae Galaxies: I. A New Window on a Prototypical Merger
Bradley C. Whitmore, Crystal Brogan, Rupali Chandar +7
We present the highest spatial resolution (~0.5") CO (3-2) observations to date of the "overlap" region in the merging Antennae galaxies (NGC 4038/39), taken with the ALMA. We repo…
Unusual CO Line Ratios and kinematics in the N83/N84 Region of the Small Magellanic Cloud
Alberto D. Bolatto, Adam Leroy, James M. Jackson +1
We present new CO 1-0 and 2-1 observations of the N83/N84 molecular cloud complex in the south-east Wing of the Small Magellanic Cloud (SMC). While the 2-1/1-0 integrated line brig…
CI and CO in Nearby Spiral Galaxies -- I. Line Ratio and Abundance Variations at ~ 200 pc Scales
Daizhong Liu, Eva Schinnerer, Toshiki Saito +25
We present new neutral atomic carbon [CI](3P1-3P0) mapping observations within the inner ~7 kpc and ~4 kpc of the disks of NGC3627 and NGC4321 at a spatial resolution of 190 pc and…
Dust/gas correlations from Herschel Observations
Julia Roman-Duval, Frank P. Israel, Alberto Bolatto +21
Spitzer and IRAS observations of the LMC suggest an excess of FIR emission with respect to the gas surface density traced by 12CO and HI 21 cm emission lines. This "FIR excess" is…
On the Variation of Gas Depletion Time
Dyas Utomo, Leo Blitz, Alberto Bolatto +4
We present an updated status of the EDGE project, which is a survey of 125 local galaxies in the CO() and CO() lines. We combine the molecular data of the E…
The Nature of Low-Density Star Formation
David Thilker, Janice Lee, Peter Capak +12
How do stars manage to form within low-density, HI-dominated gas? Such environments provide a laboratory for studying star formation with physical conditions distinct from starburs…
LABOCA observations of giant molecular clouds in the south west region of the Small Magellanic Cloud
Caroline Bot, Monica Rubio, Francois Boulanger +8
The amount of molecular gas is a key for understanding the future star formation in a galaxy. Because H2 is difficult to observe directly in dense and cold clouds, tracers like CO…
The EDGE-CALIFA Survey: Spatially Resolved 13CO(1-0) Observations and Variations in 12CO(1-0)/13CO(1-0) in Nearby Galaxies on kpc Scales
Yixian Cao, Tony Wong, Alberto D. Bolatto +12
We present 13CO(1-0) observations for the EDGE-CALIFA survey, which is a mapping survey of 126 nearby galaxies at a typical spatial resolution of 1.5 kpc. Using detected 12CO(1-0)…
Arm & Interarm Star Formation in Spiral Galaxies
Kelly Foyle, Hans-Walter Rix, Fabian Walter +1
We investigate the relationship between spiral arms and star formation in the grand-design spirals NGC 5194 and NGC 628 and in the flocculent spiral NGC 6946. Filtered maps of near…
The Spitzer Survey of the Small Magellanic Cloud: FIR Emission and Cold Gas in the SMC
Adam Leroy, Alberto Bolatto, Snezana Stanimirovic +3
We present new far infrared maps of the Small Magellanic Cloud (SMC) at 24, 70, and 160 microns obtained as part of the Spitzer Survey of the Small Magellanic Cloud (S3MC,Bolatto e…
Attenuation modified by DIG and dust as seen in M31
Neven Tomicic, Kathryn Kreckel, Brent Groves +5
The spatial distribution of dust in galaxies affects the global attenuation, and hence inferred properties, of galaxies. We trace the spatial distribution of dust in five fields (a…
PHANGS-ML: the universal relation between PAH band and optical line ratios across nearby star-forming galaxies
Dalya Baron, Karin Sandstrom, Jessica Sutter +22
The structure and chemistry of the dusty interstellar medium (ISM) are shaped by complex processes that depend on the local radiation field, gas composition, and dust grain propert…
PHANGS-MUSE: Detection and Bayesian classification of ~40000 ionised nebulae in nearby spiral galaxies
Enrico Congiu, Guillermo A. Blanc, Francesco Belfiore +15
In this work, we present a new catalogue of >40000 ionised nebulae distributed across the 19 galaxies observed by the PHANGS-MUSE survey. The nebulae have been classified using a n…
VLA+VLBA to ngVLA Transition Option Concepts
Alessandra Corsi, Joseph W. Lazio, Stefi Baum +17
The next-generation Very Large Array (ngVLA) is intended to be the premier centimeter-wavelength facility for astronomy and astrophysics, building on the substantial scientific leg…
The Density Profile of the Dark Matter Halo of NGC 4605
Alberto D. Bolatto, Joshua D. Simon, Adam Leroy +1
We have obtained ~100 pc resolution CO and ~60 pc resolution Halpha observations of the dwarf spiral galaxy NGC 4605. We use them to derive a high resolution rotation curve and stu…
CO isotopologue-derived molecular gas conditions and CO-to-H conversion factors in M51
Jakob den Brok, MarÃa J. Jiménez-Donaire, Adam Leroy +24
Over the past decade, several millimeter interferometer programs have mapped the nearby star-forming galaxy M51 at a spatial resolution of pc. This study combines observ…
Kinematics of the Atomic ISM in M33 on 80 pc scales
Eric W. Koch, Erik W. Rosolowsky, Felix J. Lockman +7
We present new L-band ($1\mbox{--}2$ GHz) observations of the nearby spiral galaxy M33 with 80 pc resolution obtained with the Karl G. Jansky Very Large Array. The HI observations,…
Discovery of 2200 new supernova remnants in 19 nearby star-forming galaxies with MUSE spectroscopy
Jing Li, K. Kreckel, S. Sarbadhicary +18
We present the largest extragalactic survey of supernova remnant (SNR) candidates in nearby star-forming galaxies using exquisite spectroscopic maps from MUSE. Supernova remnants e…
Spectral Stacking of Radio-Interferometric Data
Lukas Neumann, Jakob S. den Brok, Frank Bigiel +11
Mapping molecular line emission beyond the bright low-J CO transitions is still challenging in extragalactic studies, even with the latest generation of (sub-)mm interferometers, s…
CO excitation, molecular gas density and interstellar radiation field in local and high-redshift galaxies
Daizhong Liu, Emanuele Daddi, Eva Schinnerer +9
We study the Carbon Monoxide (CO) excitation, mean molecular gas density and interstellar radiation field (ISRF) intensity in a comprehensive sample of 76 galaxies from local to hi…
The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
Frank Bigiel, Adam Leroy, Fabian Walter +4
(Abridged) We present a comprehensive analysis of the relationship between star formation rate surface density (SFR SD) and gas surface density (gas SD) at sub-kpc resolution in a…
Bias-free Measurement of Giant Molecular Cloud Properties
Erik Rosolowsky, Adam Leroy
(abridged) We review methods for measuring the sizes, line widths, and luminosities of giant molecular clouds (GMCs) in molecular-line data cubes with low resolution and sensitivit…
Surveying the Whirlpool at Arcseconds with NOEMA (SWAN)- I. Mapping the HCN and NH 3mm lines
Sophia K. Stuber, Jerome Pety, Eva Schinnerer +17
We present the first results from "Surveying the Whirlpool at Arcseconds with NOEMA" (SWAN), an IRAM Northern Extended Millimetre Array (NOEMA)+30m large program that maps emission…
Observational Evidence Against Long-Lived Spiral Arms in Galaxies
Kelly Foyle, Hans-Walter Rix, Clare Dobbs +2
We test whether the spiral patterns apparent in many large disk galaxies should be thought of as dynamical features that are stationary in a co-rotating frame for > t_{dyn}, as imp…
Improving Star Cluster Age Estimates in PHANGS-HST Galaxies and the Impact on Cluster Demographics in NGC 628
Bradley C. Whitmore, Rupali Chandar, Janice C. Lee +29
A long-standing problem when deriving the physical properties of stellar populations is the degeneracy between age, reddening, and metallicity. When a single metallicity is used fo…
The Polycyclic Aromatic Hydrocarbon Mass Fraction on a 10 pc scale in the Magellanic Clouds
Jeremy Chastenet, Karin Sandstrom, I-Da Chiang +8
We present maps of the dust properties in the Small and Large Magellanic Clouds (SMC, LMC) from fitting Spitzer and Herschel observations with the \citet{DL07} dust model. We deriv…
Detection of diffuse HI emission in the circumgalactic medium of NGC891 and NGC4565 -- II
Sanskriti Das, Mary Rickel, Adam Leroy +6
We probe the neutral circumgalactic medium (CGM) along the major axes of NGC891 and NGC4565 in 21-cm emission out to kpc using the Green Bank Telescope (GBT), extendin…
Linking stellar populations to HII regions across nearby galaxies. II. Infrared Reprocessed and UV Direct Radiation Pressure in HII Regions
Debosmita Pathak, Adam Leroy, Todd Thompson +27
Radiation pressure is a key mechanism by which stellar feedback disrupts molecular clouds and drives HII region expansion. This includes direct radiation pressure exerted by UV pho…
Dark Matter in Dwarf Galaxies: Latest Density Profile Results
Joshua D. Simon, Alberto D. Bolatto, Adam Leroy +1
We present high-resolution two-dimensional velocity fields in Halpha and CO of the nearby dwarf galaxy NGC 2976. Our observations were made at both higher spatial resolution (~75 p…
PHANGS-JWST First Results: Dust embedded star clusters in NGC 7496 selected via 3.3 m PAH emission
Jimena Rodriguez, Janice Lee, Bradley Whitmore +38
The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from J…
High-Resolution Measurements of the Halos of Four Dark Matter-Dominated Galaxies: Deviations from a Universal Density Profile
Joshua D. Simon, Alberto D. Bolatto, Adam Leroy +2
We derive rotation curves for four nearby, low-mass spiral galaxies and use them to constrain the shapes of their dark matter density profiles. This analysis is based on high-resol…
PHANGS-JWST First Results: Stellar Feedback-Driven Excitation and Dissociation of Molecular Gas in the Starburst Ring of NGC 1365?
Daizhong Liu, Eva Schinnerer, Yixian Cao +36
We compare embedded young massive star clusters (YMCs) to (sub-)millimeter line observations tracing the excitation and dissociation of molecular gas in the starburst ring of NGC 1…
Calibrating star-formation rate prescriptions at different scales (10 pc to 1 kpc) in M31
Neven Tomicic, I-Ting Ho, Kathryn Kreckel +9
We calibrate commonly used star formation rate (SFR) prescriptions using observations in five kpc-sized fields in the nearby galaxy Andromeda (M31) at 10\,pc spatial resolution. Ou…
Infrared Sources in the Small Magellanic Cloud: First Results
Joshua D. Simon, Alberto D. Bolatto, Snezana Stanimirovic +3
We have imaged the entire Small Magellanic Cloud (SMC), one of the two nearest star-forming dwarf galaxies, in all seven IRAC and MIPS bands. The low mass and low metallicity (1/6…
Dust continuum emission as a tracer of gas mass in galaxies
Brent A. Groves, Eva Schinnerer, Adam Leroy +8
We use a sample of 36 galaxies from the KINGFISH (Herschel IR), HERACLES (IRAM CO), and THINGS (VLA HI) surveys to study empirical relations between Herschel infrared (IR) luminosi…
The Gas-Star Formation Cycle in Nearby Star-forming Galaxies II. Resolved Distributions of CO and H Emission for 49 PHANGS Galaxies
Hsi-An Pan, Eva Schinnerer, Annie Hughes +36
The relative distribution of molecular gas and star formation in galaxies gives insight into the physical processes and timescales of the cycle between gas and stars. In this work,…
The EGNoG Survey: Molecular Gas in Intermediate-Redshift Star-Forming Galaxies
Amber Bauermeister, Leo Blitz, Alberto D. Bolatto +6
We present the Evolution of molecular Gas in Normal Galaxies (EGNoG) survey, an observational study of molecular gas in 31 star-forming galaxies from z=0.05 to z=0.5, with stellar…
The Molecular Wind in the Nearest Seyfert Galaxy Circinus Revealed by ALMA
Laura K. Zschaechner, Fabian Walter, Alberto Bolatto +6
We present ALMA observations of the inner 1' (1.2 kpc) of the Circinus galaxy, the nearest Seyfert. We target CO (1-0) in the region associated with a well-known multiphase outflow…