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View article: A VLA search for compact radio sources in the explosive molecular outflows DR 21 and G5.89
A VLA search for compact radio sources in the explosive molecular outflows DR 21 and G5.89 Open
We present high-angular-resolution ($\sim 0\rlap{.}^{\prime \prime }1$) VLA Ku-band (12–18 GHz) observations of two explosive molecular outflows (EMOs), DR 21 and G5.89, in a search for runaway stars related to these explosive events. In D…
View article: The ALMA-QUARKS Survey. III. Clump-to-core Fragmentation and Searches for High-mass Starless Cores
The ALMA-QUARKS Survey. III. Clump-to-core Fragmentation and Searches for High-mass Starless Cores Open
The Querying Underlying mechanisms of massive star formation with ALMA-Resolved gas Kinematics and Structures (QUARKS) survey observed 139 infrared-bright (IR-bright) massive protoclusters at 1.3 mm wavelength with the Atacama Large Millim…
View article: Gravity or turbulence? – VII. The Schmidt–Kennicutt law, the star formation efficiency, and the mass density of clusters from gravitational collapse rather than turbulent support
Gravity or turbulence? – VII. The Schmidt–Kennicutt law, the star formation efficiency, and the mass density of clusters from gravitational collapse rather than turbulent support Open
We explore the Schmidt–Kennicutt (SK) relations and the star formation efficiency per free-fall time ($\epsilon _{\rm ff}$), mirroring observational studies, in numerical simulations of filamentary molecular clouds undergoing gravitational…
View article: Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint
Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint Open
We present high-resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations at 0.89 mm of the Class II brown dwarf 2MASS J04442713+2512164 (2M0444), achieving a spatial resolution of 0 046 (∼6.4 au at the distance to …
View article: On the relation between magnetic field strength and gas density in the interstellar medium: a multiscale analysis
On the relation between magnetic field strength and gas density in the interstellar medium: a multiscale analysis Open
The relationship between magnetic field strength B and gas density n in the interstellar medium is of fundamental importance. We present and compare Bayesian analyses of the B–n relation for two comprehensive observational data sets: a Zee…
View article: Testing the bloated star hypothesis in the massive young stellar object IRAS 19520+2759 through optical and infrared variability
Testing the bloated star hypothesis in the massive young stellar object IRAS 19520+2759 through optical and infrared variability Open
Using optical time series with Telescopi Joan Oró (TJO), Gaia, TESS, and NEOWISE archival data, we performed a variability study on the candidate bloated massive young stellar object (MYSO) IRAS 19520+2759. This is the first time that a bl…
View article: The arc-shaped radio source at the centre of NGC 6334A: is it a colliding wind region of two young massive stars or the bow shock of a runaway star?
The arc-shaped radio source at the centre of NGC 6334A: is it a colliding wind region of two young massive stars or the bow shock of a runaway star? Open
New multiwavelength Karl G. Jansky VLA observations of CKR02A, the compact radio source in the centre of the compact H ii region NGC 6334A, are presented. The observations were carried out in five epochs and included the frequency ranges 8…
View article: Substellar candidates at the earliest stages: The SUCANES database
Substellar candidates at the earliest stages: The SUCANES database Open
Context . Brown dwarfs are the bridge between low-mass stars and giant planets. One way of shedding light on their dominant formation mechanism is to study them at the earliest stages of their evolution, when they are deeply embedded in th…
View article: The arc-shaped radio source at the center of NGC 6334A: Is it a colliding wind region of two young massive stars or the bow shock of a runaway star?
The arc-shaped radio source at the center of NGC 6334A: Is it a colliding wind region of two young massive stars or the bow shock of a runaway star? Open
New multi-wavelength Karl G. Jansky VLA observations of CKR02A, the compact radio source in the center of the compact HII region NGC 6334A, are presented. The observations were carried out in five epochs and included the frequency ranges 8…
View article: ngVLA Synthetic Observations of Ionized Gas in Massive Protostars
ngVLA Synthetic Observations of Ionized Gas in Massive Protostars Open
Massive-star formation involves significant ionization in the innermost regions near the central object, such as gravitationally trapped H ii regions, jets, ionized disks, or winds. Resolved observations of the associated continuum and rec…
View article: ngVLA Synthetic Observations of Ionized Gas in Massive Protostars
ngVLA Synthetic Observations of Ionized Gas in Massive Protostars Open
Massive star formation involves significant ionization in the innermost regions near the central object, such as gravitationally trapped H II regions, jets, ionized disks, or winds. Resolved observations of the associated continuum and rec…
View article: Substellar candidates at the earliest stages: the SUCANES database
Substellar candidates at the earliest stages: the SUCANES database Open
Brown dwarfs are the bridge between low-mass stars and giant planets. One way of shedding light on their dominant formation mechanism is to study them at the earliest stages of their evolution, when they are deeply embedded in their parent…
View article: Observations of pre- and proto-brown dwarfs in nearby clouds: paving the way to further constraining theories of brown dwarf formation
Observations of pre- and proto-brown dwarfs in nearby clouds: paving the way to further constraining theories of brown dwarf formation Open
Brown Dwarfs (BDs) are crucial objects in our understanding of both star and planet formation. However, there is still an unconcluded debate about which is the dominant formation mechanism of these objects. For this, it is mandatory to stu…
View article: ATOMS: ALMA three-millimetre observations of massive star-forming regions–XVII. High-mass star-formation through a large-scale collapse in IRAS 15394-5358
ATOMS: ALMA three-millimetre observations of massive star-forming regions–XVII. High-mass star-formation through a large-scale collapse in IRAS 15394-5358 Open
Hub-filament systems are considered as natural sites for high-mass star formation. Kinematic analysis of the surroundings of hub-filaments is essential to better understand high-mass star formation within such systems. In this work, we pre…
View article: ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions $-$ XVII. High-mass star-formation through a large-scale collapse in IRAS 15394$-$5358
ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions $-$ XVII. High-mass star-formation through a large-scale collapse in IRAS 15394$-$5358 Open
Hub-filament systems are considered as natural sites for high-mass star formation. Kinematic analysis of the surroundings of hub-filaments is essential to better understand high-mass star formation within such systems. In this work, we pre…
View article: Gravity or turbulence? VII. The Schmidt-Kennicutt law, the star formation efficiency, and the mass density of clusters from gravitational collapse rather than turbulent support
Gravity or turbulence? VII. The Schmidt-Kennicutt law, the star formation efficiency, and the mass density of clusters from gravitational collapse rather than turbulent support Open
We explore the Schmidt-Kennicutt (SK) relations and the star formation efficiency per free-fall time ($ε_{\rm ff}$), mirroring observational studies, in numerical simulations of filamentary molecular clouds undergoing gravitational contrac…
View article: Gravity or turbulence? – VI. The physics behind the Kennicutt–Schmidt relation
Gravity or turbulence? – VI. The physics behind the Kennicutt–Schmidt relation Open
We explain the large variety of star formation laws in terms of one single, simple law that can be inferred from the definition of the star formation rate and basic algebra. The resulting equation, ${\rm SFR}= {\epsilon _\mathrm{ff}}\ M_\m…
View article: Gravity or turbulence? VI. The physics behind the Kennicutt-Schmidt relations
Gravity or turbulence? VI. The physics behind the Kennicutt-Schmidt relations Open
We explain the large variety of star formation laws in terms of one single, simple law that can be inferred from the definition of the star formation rate and basic algebra. The resulting equation, $\SFR = \eff\ \Mcollapsing/\tauff$, altho…
View article: The Turbulent Support (TS) and Global Hierarchical Collapse (GHC) models for molecular clouds compared. Differences, convergence, and myths
The Turbulent Support (TS) and Global Hierarchical Collapse (GHC) models for molecular clouds compared. Differences, convergence, and myths Open
We provide a detailed comparison between the ``turbulent support'' (TS) and ``global hierarchical collapse'' (GHC) models for molecular clouds and star formation, their respective interpretations of the observational data, the features the…
View article: On the relation between magnetic field strength and gas density in the interstellar medium: A multiscale analysis
On the relation between magnetic field strength and gas density in the interstellar medium: A multiscale analysis Open
The magnetic field strength to gas density relation in the interstellar medium is of fundamental importance. We present and compare Bayesian analyses of the B-n relation for two comprehensive observational data sets: a Zeeman data set and …
View article: Can radial temperature profiles be inferred using NH3 (1, 1) and (2, 2) observations?
Can radial temperature profiles be inferred using NH3 (1, 1) and (2, 2) observations? Open
A number of works infer radial temperature profiles of envelopes surrounding young stellar objects using several rotational transitions in a pixel-by-pixel or azimuthally-averaged basis. However, in many cases the assumption that the rotat…
View article: The ALMA-QUARKS Survey: Detection of Two Extremely Dense Substructures in a Massive Prestellar Core
The ALMA-QUARKS Survey: Detection of Two Extremely Dense Substructures in a Massive Prestellar Core Open
Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the Atacama Large Milli…
View article: Can radial temperature profiles be inferred using NH3 (1, 1) and (2, 2) observations?
Can radial temperature profiles be inferred using NH3 (1, 1) and (2, 2) observations? Open
A number of works infer radial temperature profiles of envelopes surrounding young stellar objects using several rotational transitions in a pixel-by-pixel or azimuthally averaged basis. However, in many cases the assumption that the rotat…
View article: The ALMA-QUARKS survey: Detection of two extremely dense substructures in a massive prestellar core
The ALMA-QUARKS survey: Detection of two extremely dense substructures in a massive prestellar core Open
Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the ALMA-ATOMS survey a…
View article: The ALMA Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE): Core Growth, Cluster Contraction, and Primordial Mass Segregation
The ALMA Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE): Core Growth, Cluster Contraction, and Primordial Mass Segregation Open
The Atacama Large Millimeter/submillimeter Array (ALMA) Survey of Star Formation and Evolution in Massive Protoclusters with Blue Profiles (ASSEMBLE) aims to investigate the process of mass assembly and its connection to high-mass star for…
View article: Density distributions, magnetic field structures, and fragmentation in high-mass star formation
Density distributions, magnetic field structures, and fragmentation in high-mass star formation Open
Context . The fragmentation of high-mass star-forming regions depends on a variety of physical parameters, including density, the magnetic field, and turbulent gas properties. Aims . We evaluate the importance of the density and magnetic f…
View article: Radio survey of the stellar population in the infrared dark cloud G14.225-0.506
Radio survey of the stellar population in the infrared dark cloud G14.225-0.506 Open
Context . The infrared dark cloud (IRDC) G14.225-0.506 is part of the extended and massive molecular cloud located to the southwest of the H II region M17. The cloud is associated with a network of filaments, which result in two different …
View article: Radio survey of the stellar population in the infrared dark cloud G14.225-0.506
Radio survey of the stellar population in the infrared dark cloud G14.225-0.506 Open
The IRDC G14.225-0.506 is associated with a network of filaments, which result in two different dense hubs, as well as with several signposts of star formation activity. The aim of this work is to study the cm continuum emission to charact…
View article: Density distributions, magnetic field structures and fragmentation in high-mass star formation
Density distributions, magnetic field structures and fragmentation in high-mass star formation Open
Methods: Observing the large pc-scale Stokes I mm dust continuum emission with the IRAM 30m telescope and the intermediate-scale (<0.1pc) polarized submm dust emission with the Submillimeter Array toward a sample of 20 high-mass star-formi…
View article: Interstellar complex organic molecules towards outflows from the G351.16+0.70 (NGC 6334 V) massive protostellar system
Interstellar complex organic molecules towards outflows from the G351.16+0.70 (NGC 6334 V) massive protostellar system Open
G351.16+0.70 is a relatively well-studied high-mass star-forming region with at least two main bipolar outflow structures originating from an OB-embedded star and multiple IR sources. Using high-resolution and large-bandwidth SMA observati…