Explanipedia

Masses, Star Formation Efficiencies, and Dynamical Evolution of 18,000 H ii Regions Open

Debosmita Pathak, Adam K. Leroy, Ashley T. Barnes, Todd A. Thompson, Laura A. Lopez , et al. · 2025

We present measurements of the masses associated with ∼18,000 H ii regions across 19 nearby star-forming galaxies by combining data from JWST, Hubble Space Telescope, MUSE, Atacama Large Millimeter/submillimeter Array, Very Large Arra…

The PHANGS-MUSE/HST-Hα nebulae catalogue. Parsec-scale resolved structure, physical conditions, and stellar associations across nearby galaxies Open

Ashley T. Barnes, Rupali Chandar, K. Kreckel, Francesco Belfiore, Debosmita Pathak , et al. · 2025

We present the PHANGS-MUSE/HST-Hα nebulae catalogue, comprising spatially resolved nebulae across 19 nearby star-forming galaxies (D<20,Mpc), based on high-resolution Hα imaging from HST, homogenised to a fixed (10,pc) physical resolution …

The PHANGS-MUSE/HST-Halpha Nebulae Catalogue Open

Ashley T. Barnes, R. Chandar, Kathryn Kreckel, Francesco Belfiore, Debosmita Pathak , et al. · 2025

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 Halpha imaging from HST, homogenised to a fixed 10 pc resolutio…

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

Oleg V. Egorov, Adam K. Leroy, Karin Sandström, Kathryn Kreckel, Dalya Baron , et al. · 2025

Polycyclic aromatic hydrocarbons (PAHs) are widespread in the interstellar medium (ISM) of near solar metallicity galaxies, where they play a critical role in ISM heating, cooling, and reprocessing stellar radiation. The PAH fraction, the …

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

Jessica Sutter, Karin Sandström, Ryan Chown, Oleg V. Egorov, Adam K. Leroy , et al. · 2025

We characterize two candidate cool galactic outflows in two relatively low-mass, highly inclined Virgo cluster galaxies: NGC 4424 and NGC 4694. Previous analyses of observations using the Atacama Large Millimeter/submillimeter Array carbon…

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

Debosmita Pathak, Adam K. Leroy, Ashley. T. Barnes, Todd A. Thompson, Laura A. Lopez , et al. · 2025

We present measurements of the masses associated with $\sim18,000$ HII regions across 19 nearby star-forming galaxies by combining data from JWST, HST, MUSE, ALMA, VLA, and MeerKAT from the multi-wavelength PHANGS survey. We report 10 pc-s…

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

Adam K. Leroy, Kathryn Kreckel, Francesco Belfiore, Ryan Chown, Jessica Sutter , et al. · 2025

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 reprocessing stellar radiation. The PAH fraction, the abund…

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

Jessica Sutter, Karin Sandström, Ryan Chown, Oleg V. Egorov, Adam K. Leroy , et al. · 2025

We characterize two candidate cool galactic outflows in two relatively low mass, highly inclined Virgo cluster galaxies: NGC4424 and NGC4694. Previous analyses of observations using the Atacama Large Millimeter Array (ALMA) carbon monoxide…

Survivors and Zombies: The Quenching and Disruption of Satellites Around Milky Way Analogs Open

Debosmita Pathak, Charlotte Christensen, Alyson Brooks, Ferah Munshi, Anna C. Wright , et al. · 2025

It is necessary to understand the full accretion history of the Milky Way in order to contextualize the properties of observed Milky Way satellite galaxies and the stellar halo. This paper compares the dynamical properties and star formati…

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

Jenny J. Kim, Francesco Belfiore, J. M. Diederik Kruijssen, Andrea Romanelli, A. Amiri , et al. · 2025

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 attenuated. Infrared telescopes such as JWST have made it possible …

Relationships between Polycyclic Aromatic Hydrocarbons, Small Dust Grains, H2, and H i in Local Group Dwarf Galaxies NGC 6822 and WLM Using JWST, ALMA, and the VLA Open

Ryan Chown, Adam K. Leroy, Alberto D. Bolatto, Jérémy Chastenet, Simon C. O. Glover , et al. · 2025

We present 0.6–3.2 pc resolution mid-infrared (MIR) JWST images at 7.7 μ m (F770W) and 21 μ m (F2100W) covering the main star-forming regions of two of the closest star-forming low-metallicity dwarf galaxies, NGC 6822 and Wolf–Lundmark–Mel…

Relationships between PAHs, Small Dust Grains, H$_2$, and HI in Local Group Dwarf Galaxies NGC 6822 and WLM Using JWST, ALMA, and the VLA Open

Ryan Chown, Adam K. Leroy, Alberto D. Bolatto, Jérémy Chastenet, Simon C. O. Glover , et al. · 2025

We present 0.7-3.3 pc resolution mid-infrared (MIR) JWST images at 7.7 $μ$m (F770W) and 21 $μ$m (F2100W) covering the main star-forming regions of two of the closest star-forming low-metallicity dwarf galaxies, NGC6822 and Wolf-Lundmark-Me…

Polycyclic Aromatic Hydrocarbon and CO(2–1) Emission at 50–150 pc Scales in 70 Nearby Galaxies Open

Ryan Chown, Adam K. Leroy, Karin Sandström, Jérémy Chastenet, Jessica Sutter , et al. · 2025

Combining Atacama Large Millimeter/submillimeter Array CO(2–1) mapping and JWST near- and mid-infrared imaging, we characterize the relationship between CO(2–1) and polycyclic aromatic hydrocarbon (PAH) emission at ≈100 pc resolution in 70…

Linking Stellar Populations to H ii Regions across Nearby Galaxies. II. Infrared Reprocessed and UV Direct Radiation Pressure in H ii Regions Open

Debosmita Pathak, Adam K. Leroy, Todd A. Thompson, Laura A. Lopez, Ashley T. Barnes , et al. · 2025

Radiation pressure is a key mechanism by which stellar feedback disrupts molecular clouds and drives H ii region expansion. This includes direct radiation pressure exerted by UV photons on dust grains, pressure associated with photoionizat…

PAH Feature Ratios around Stellar Clusters and Associations in 19 Nearby Galaxies Open

Daniel A. Dale, G. A. Graham, Ashley T. Barnes, Dalya Baron, Frank Bigiel , et al. · 2025

We present a comparison of observed polycyclic aromatic hydrocarbon (PAH) feature ratios in 19 nearby galaxies with a grid of theoretical expectations for near- and mid-infrared dust emission. The PAH feature ratios are drawn from Cycle 1 …

Linking stellar populations to HII regions across nearby galaxies. II. Infrared Reprocessed and UV Direct Radiation Pressure in HII Regions Open

Debosmita Pathak, Adam K. Leroy, Todd A. Thompson, Laura A. Lopez, Ashley T. Barnes , et al. · 2025

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 photons on dust grains, pressure associated with photoionizati…

PAH Feature Ratios Around Stellar Clusters and Associations in 19 Nearby Galaxies Open

Daniel A. Dale, G. A. Graham, Ashley T. Barnes, Dalya Baron, Frank Bigiel , et al. · 2025

We present a comparison of observed polycyclic aromatic hydrocarbon (PAH) feature ratios in 19 nearby galaxies with a grid of theoretical expectations for near- and mid-infrared dust emission. The PAH feature ratios are drawn from Cycle 1 …

PHANGS-ML: The Universal Relation between PAH Band and Optical Line Ratios across Nearby Star-forming Galaxies Open

Dalya Baron, Karin Sandström, Jessica Sutter, Hamid Hassani, Brent Groves , et al. · 2025

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 properties. Of particular importance are polycyclic aromatic hydro…

Polycyclic Aromatic Hydrocarbon and CO(2-1) Emission at 50-150 pc Scales in 70 Nearby Galaxies Open

Ryan Chown, Adam K. Leroy, Karin Sandström, Jérémy Chastenet, Jessica Sutter , et al. · 2024

Combining Atacama Large Millimeter/sub-millimeter Array CO(2-1) mapping and JWST near- and mid-infrared imaging, we characterize the relationship between CO(2-1) and polycyclic aromatic hydrocarbon (PAH) emission at ~100 pc resolution in 7…

PHANGS-ML: the universal relation between PAH band and optical line ratios across nearby star-forming galaxies Open

Dalya Baron, Karin Sandström, Jessica Sutter, Hamid Reza Hassani, Brent Groves , et al. · 2024

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 properties. Of particular importance are Polycyclic Aromatic Hydro…

The Fraction of Dust Mass in the Form of Polycyclic Aromatic Hydrocarbons on 10–50 pc Scales in Nearby Galaxies Open

Jessica Sutter, Karin Sandström, Jérémy Chastenet, Adam K. Leroy, Eric W. Koch , et al. · 2024

Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous component of the interstellar medium (ISM) in z ∼ 0 massive, star-forming galaxies and play key roles in ISM energy balance, chemistry, and shielding. Wide field-of-view, high-resolu…

PHANGS-MeerKAT and MHONGOOSE HI observations of nearby spiral galaxies: Physical drivers of the molecular gas fraction, Rmol Open

Cosima Eibensteiner, Jiayi Sun, Frank Bigiel, Adam K. Leroy, E. Schinnerer , et al. · 2024

The molecular-to-atomic gas ratio is crucial to our understanding of the evolution of the interstellar medium (ISM) in galaxies. We investigated the balance between the atomic (Σ HI ) and molecular gas (Σ H2 ) surface densities in eight ne…

PHANGS-MeerKAT and MHONGOOSE HI observations of nearby spiral galaxies: physical drivers of the molecular gas fraction, $R_{\mathrm{mol}}$ Open

Cosima Eibensteiner, Jiayi Sun, Frank Bigiel, Adam K. Leroy, E. Schinnerer , et al. · 2024

The molecular-to-atomic gas ratio is crucial to the evolution of the interstellar medium in galaxies. We investigate the balance between the atomic ($Σ_{\rm HI}$) and molecular gas ($Σ_{\rm H2}$) surface densities in eight nearby star-form…

PHANGS-JWST: Data-processing Pipeline and First Full Public Data Release Open

Thomas G. Williams, Janice Lee, Kirsten L. Larson, Adam K. Leroy, Karin Sandström , et al. · 2024

The exquisite angular resolution and sensitivity of JWST are opening a new window for our understanding of the Universe. In nearby galaxies, JWST observations are revolutionizing our understanding of the first phases of star formation and …

Hα Emission and H ii Regions at the Locations of Recent Supernovae in Nearby Galaxies Open

Ness Mayker Chen, Adam K. Leroy, Sumit K. Sarbadhicary, Laura A. Lopez, Todd A. Thompson , et al. · 2024

We present a statistical analysis of the local, ≈50–100 pc scale, H α emission at the locations of recent (≤125 yr) supernovae (SNe) in nearby star-forming galaxies. Our sample consists of 32 SNe in 10 galaxies that are targets of the PHAN…

PHANGS-ML: Dissecting Multiphase Gas and Dust in Nearby Galaxies Using Machine Learning Open

Dalya Baron, Karin Sandström, Erik Rosolowsky, Oleg V. Egorov, Ralf S. Klessen , et al. · 2024

The PHANGS survey uses Atacama Large Millimeter/submillimeter Array, Hubble Space Telescope, Very Large Telescope, and JWST to obtain an unprecedented high-resolution view of nearby galaxies, covering millions of spatially independent regi…

The Fraction of Dust Mass in the Form of PAHs on 10-50 pc Scales in Nearby Galaxies Open

Jessica Sutter, Karin Sandström, Jérémy Chastenet, Adam K. Leroy, Eric W. Koch , et al. · 2024

Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous component of the interstellar medium (ISM) in z~0 massive, star-forming galaxies and play key roles in ISM energy balance, chemistry, and shielding. Wide field of view, high resoluti…

H-alpha emission and HII regions at the locations of recent supernovae in nearby galaxies Open

Ness Mayker Chen, Adam K. Leroy, Sumit K. Sarbadhicary, Laura A. Lopez, Todd A. Thompson , et al. · 2024

We present a statistical analysis of the local, approximately 50-100 pc scale, H-alpha emission at the locations of recent (less than 125 years) supernovae (SNe) in nearby star-forming galaxies. Our sample consists of 32 SNe in 10 galaxies…

PHANGS-ML: dissecting multiphase gas and dust in nearby galaxies using machine learning Open

Dalya Baron, Karin Sandström, Erik Rosolowsky, Oleg V. Egorov, Ralf S. Klessen , et al. · 2024

The PHANGS survey uses ALMA, HST, VLT, and JWST to obtain an unprecedented high-resolution view of nearby galaxies, covering millions of spatially independent regions. The high dimensionality of such a diverse multi-wavelength dataset make…

PHANGS-JWST: Data Processing Pipeline and First Full Public Data Release Open

Thomas G. Williams, Janice C. Lee, Kirsten L. Larson, Adam K. Leroy, Karin Sandström , et al. · 2024

The exquisite angular resolution and sensitivity of JWST is opening a new window for our understanding of the Universe. In nearby galaxies, JWST observations are revolutionizing our understanding of the first phases of star formation and t…

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