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Resolved Dust Emission and CO Isotopologues in Giant Molecular Clouds of the Andromeda Galaxy
Chloe Bosomworth, Jan Forbrich, Charles J. Lada +1
Dust emission at submillimeter wavelengths can be used to reliably trace the basic properties of molecular clouds. Early results from a recent Submillimeter Array (SMA) survey of t…
Differential virial analysis: a new technique to determine the dynamical state of molecular clouds
Mark R. Krumholz, Charles J. Lada, Jan Forbrich
Since molecular clouds form stars, at least some parts of them must be in a state of collapse. However, there is a long-standing debate as to whether that collapse is local, involv…
The Role of Pressure in the Structure and Stability of GMCs in the Andromeda Galaxy
C. J. Lada, J. Forbrich, M. R. Krumholz +1
We revisit the role of pressure in the structure, stability and confinement of Giant Molecular Clouds (GMCs) in light of recently published observations and analysis of the GMCs in…
Cloud-scale elemental abundance variations and the CO-to-dust-mass conversion factor in M31
Chloe Bosomworth, Jan Forbrich, Charles J. Lada +3
From a spectroscopic survey of candidate H II regions in the Andromeda galaxy (M31) with MMT/Hectospec, we have identified 294 H II regions using emission line ratios and calculate…
The Molecular Clouds of M31
Charles J. Lada, Jan Forbrich, Glen Petitpas +1
Deep interferometric observations of CO and dust continuum emission are obtained with the Sub-Millimeter Array (SMA) at 230 GHz to investigate the physical nature of the giant mole…
Tracing Dense Gas in Six Resolved GMCs of the Andromeda Galaxy
Jan Forbrich, Charles J. Lada, Jérôme Pety +1
We present dense-gas--tracing molecular observations of six resolved Giant Molecular Clouds (GMCs) in the Andromeda Galaxy (M31). Using the NOEMA interferometer, we observed the tr…
A Parsec-Scale Catalog of Molecular Clouds in the Solar Neighborhood Based on 3D Dust Mapping: Implications for the Mass-Size Relation
Shlomo Cahlon, Catherine Zucker, Alyssa Goodman +2
We dendrogram the Leike et al. 2020 3D dust map, leveraging its pc spatial resolution to produce a uniform catalog of molecular clouds in the solar neighborhood. Using acc…
VISIONS: The VISTA Star Formation Atlas -- I. Survey overview
Stefan Meingast, João Alves, Hervé Bouy +37
VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Aus…
A Complete HCN Survey of the Perseus Molecular Cloud
T. M. Dame, Charles J. Lada
We present a survey of the Perseus molecular cloud in the J 10 transition of HCN, a widely used tracer of dense molecular gas. The survey was conducted with the Cf…
Systematic Investigation of Dust and Gaseous CO in 12 Nearby Molecular Clouds
John Arban Lewis, Charles J. Lada, Thomas Dame
We report the first uniform and systematic study of dust and molecular gas in nearby molecular clouds. We use surveys of dust extinction and emission to determine the opacity and m…
Simultaneous Deep Measurements of CO isotopologues and Dust Emission in Giant Molecular Clouds in the Andromeda Galaxy
Sébastien Viaene, Jan Forbrich, Charles J. Lada +2
We present simultaneous measurements of emission from dust continuum at 230 GHz and the J=2-1 CO, CO and CO isotopologues at 15 pc resolution from indiv…
Probing the Cold Deep Depths of the California Molecular Cloud: The Icy Relationship between CO and Dust
John Arban Lewis, Charles Lada, John Bieging +3
We study the relationship between molecular gas and dust in the California Molecular Cloud over an unprecedented dynamic range of cloud depth (Av = 3 - 60 magnitudes). We compare d…
The Mass-Size Relation and the Constancy of GMC Surface Densities in the Milky Way
C. J. Lada, T. M. Dame
We use two existing molecular cloud catalogs derived from the same CO survey and two catalogs derived from local dust extinction surveys to investigate the nature of the GMC mass-s…
First Resolved Dust Continuum Measurements of Individual Giant Molecular Clouds in the Andromeda Galaxy
Jan Forbrich, Charles J. Lada, Sébastien Viaene +1
In our local Galactic neighborhood, molecular clouds are best studied using a combination of dust measurements, to determine robust masses, sizes and internal structures of the clo…
3D shape of Orion A from Gaia DR2
Josefa E. Grossschedl, Joao Alves, Stefan Meingast +16
We use the DR2 distances of about 700 mid-infrared selected young stellar objects in the benchmark giant molecular cloud Orion A to infer its 3D shape and orientati…
The HP2 Survey - IV. The Pipe nebula: Effective dust temperatures in dense cores
Birgit Hasenberger, Marco Lombardi, João Alves +3
Multi-wavelength observations in the sub-mm regime provide information on the distribution of both the dust column density and the effective dust temperature in molecular clouds. I…
The ALMA view of GMCs in NGC 300: Physical Properties and Scaling Relations at 10 pc Resolution
Christopher M. Faesi, Charles J. Lada, Jan Forbrich
We have conducted a CO(2-1) survey of several molecular gas complexes in the vicinity of H II regions within the spiral galaxy NGC 300 using the Atacama Large Millimeter Arr…
Gathering dust: A galaxy-wide study of dust emission from cloud complexes in NGC 300
M. Riener, C. M. Faesi, J. Forbrich +1
We used multi-band observations by the Herschel Space Observatory to study the dust emission properties of the nearby spiral galaxy NGC 300. We compiled a first catalogue of the po…
HP2 survey: III The California Molecular Cloud--A Sleeping Giant Revisited
Charles J. Lada, John A. Lewis, Marco Lombardi +1
We present new high resolution and dynamic range dust column density and temperature maps of the California Molecular Cloud derived from a combination of Planck and Herschel dust-e…
The shapes of column density PDFs - The importance of the last closed contour
João Alves, Marco Lombardi, Charles Lada
The probability distribution function of column density (PDF) has become the tool of choice for cloud structure analysis and star formation studies. Its simplicity is attractive, a…
X Marks the Spot: Nexus of Filaments, Cores, and Outflows in a Young Star-Forming Region
Nia Imara, Charles Lada, John Lewis +4
We present a multiwavelength investigation of a region of a nearby giant molecular cloud that is distinguished by a minimal level of star formation activity. With our new 12CO(J=2-…
Protostars at Low Extinction in Orion A
John Arban Lewis, Charles J Lada
In the list of young stellar objects compiled by Megeath et al. (2012) for the Orion A molecular cloud, only 44 out of 1208 sources found projected onto low extinction (Ak<0.8 mag)…
Resolving Giant Molecular Clouds in NGC 300: A First Look with the Submillimeter Array
Christopher Faesi, Charles Lada, Jan Forbrich
We present the first high angular resolution study of giant molecular clouds (GMCs) in the nearby spiral galaxy NGC 300, based on observations from the Submillimeter Array (SMA). W…
VISION - Vienna survey in Orion I. VISTA Orion A Survey
Stefan Meingast, João Alves, Diego Mardones +17
Orion A hosts the nearest massive star factory, thus offering a unique opportunity to resolve the processes connected with the formation of both low- and high-mass stars. Here we p…