Roberto Galván-Madrid
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View article: ALMA-IMF. XX. Core Fragmentation in the W51 High-mass Star-forming Region
ALMA-IMF. XX. Core Fragmentation in the W51 High-mass Star-forming Region Open
We present a study of core fragmentation in the W51-E and W51-IRS2 protoclusters in the W51 high-mass star-forming region. The identification of core fragmentation is achieved by the spatial correspondence of cores and compact sources, whi…
View article: ALMA-IMF. XXI.: N$_2$H$^+$ kinematics in the G012.80 protocluster: Evidence for filament rotation and evolution
ALMA-IMF. XXI.: N$_2$H$^+$ kinematics in the G012.80 protocluster: Evidence for filament rotation and evolution Open
(abridged) We aim to characterize kinematic processes in the G012.80 protocluster. We principally focus on the N$_2$H$^+$(1$-$0) emission to trace the dense and cold gas. Additionally, we use lines such as DCN(3$-$2), H41$α$, C$^{18}$O(1$-…
View article: ALMA-IMF XX: Core fragmentation in the W51 high-mass star-forming region
ALMA-IMF XX: Core fragmentation in the W51 high-mass star-forming region Open
We present a study of core fragmentation in the W51-E and W51-IRS2 protoclusters in the W51 high-mass star-forming region. The identification of core fragmentation is achieved by the spatial correspondence of cores and compact sources whic…
View article: ALMA-IMF
ALMA-IMF Open
ALMA-IMF is a Large Program of the Atacama Large Millimeter/submillimeter Array (ALMA) that aims to determine the origin of the core mass function (CMF) of 15 massive Galactic protoclusters (~1.0–25.0 × 10 3 M ⊙ within ~2.5 × 2.5 pc 2 ) lo…
View article: Hierarchical fragmentation in hub-filament-system I18308 observed as part of the INFANT survey
Hierarchical fragmentation in hub-filament-system I18308 observed as part of the INFANT survey Open
Context. There is increasing evidence of a physical link between high-mass star formation and hub-filament systems (HFSs). However, a lack of multi-scale observations of HFS clouds hinders our understanding of the detailed and scale-depend…
View article: ALMA-IMF
ALMA-IMF Open
ALMA-IMF observed 15 massive protoclusters capturing multiple spectral lines and the continuum emission. Here, we focus on the massive protocluster G351.77 (~2500 M ⊙ , estimated from single-dish continuum observations) located at 2 kpc. W…
View article: Erosion of a dense molecular core by a strong outflow from a massive protostar
Erosion of a dense molecular core by a strong outflow from a massive protostar Open
Context. Molecular outflows from massive protostars can impact the interstellar medium in different ways, adding turbulence on different spatial scales, dragging material at supersonic velocities, producing shocks and heating, and physical…
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: Supplementary material of ALMA-IMF XVII (Valeille-Manet et al. 2025)
Supplementary material of ALMA-IMF XVII (Valeille-Manet et al. 2025) Open
We show the supplementary material of the ALMA-IMF XVII article, accepted by A&A on the 27th of January of 2025 and accessible on arXiv with the identifier 2502.09426
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: A Wideband Chemical Survey of Massive Star-forming Regions at Subarcsecond Resolution with the Submillimeter Array
A Wideband Chemical Survey of Massive Star-forming Regions at Subarcsecond Resolution with the Submillimeter Array Open
Massive star-forming regions exhibit a rich chemistry with complex gas distributions, especially on small scales. While surveys have yielded constraints on typical gas conditions, they often have coarse spatial resolution and limited bandw…
View article: Supplementary material of ALMA-IMF XVI (Motte et al. 2025)
Supplementary material of ALMA-IMF XVI (Motte et al. 2025) Open
Figure entitled "ALMA-IMF-XVI_FigureD3.png" displays the distribution of the mass-averaged dust temperature of prestellar cores located within luminosity peaks (orange histogram) and far away from them (green histogram), as indicated by th…
View article: A Wideband Chemical Survey of Massive Star-forming Regions at Subarcsecond Resolution with the Submillimeter Array
A Wideband Chemical Survey of Massive Star-forming Regions at Subarcsecond Resolution with the Submillimeter Array Open
Massive star-forming regions exhibit a rich chemistry with complex gas distributions, especially on small scales. While surveys have yielded constraints on typical gas conditions, they often have coarse spatial resolution and limited bandw…
View article: ALMA-IMF XVIII: The assembly of a star cluster: Dense N$_2$H$^+$ (1-0) kinematics in the massive G351.77 protocluster
ALMA-IMF XVIII: The assembly of a star cluster: Dense N$_2$H$^+$ (1-0) kinematics in the massive G351.77 protocluster Open
ALMA-IMF observed 15 massive protoclusters capturing multiple spectral lines and the continuum emission. We focus on the G351.77 protocluster ($\sim$ 2500 M$_{\odot}$, estimated from single-dish continuum observations) located at 2 kpc. We…
View article: NASCENT-stars large program: origin of molecular complexity towards emerging high-mass protostars
NASCENT-stars large program: origin of molecular complexity towards emerging high-mass protostars Open
During the star formation process, the interstellar medium gets enriched in a complex zoo of molecules. The extremely rich chemistry of the star forming gas holds the key to constrain the link between the chemistry of disks and their formi…
View article: ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters
ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters Open
We use the H41 α recombination line to create templates of the millimeter free–free emission in the ALMA-IMF continuum maps, which allows us to separate it from dust emission. This method complements spectral-index information and extrapol…
View article: ALMA-IMF
ALMA-IMF Open
The stellar initial mass function (IMF) is critical to our understanding of star formation and the effects of young stars on their environment. On large scales, it enables us to use tracers such as UV or Hα emission to estimate the star fo…
View article: ALMA-IMF XV: The core mass function in the high-mass star-formation regime
ALMA-IMF XV: The core mass function in the high-mass star-formation regime Open
The stellar initial mass function (IMF) is critical to our understanding of star formation and the effects of young stars on their environment. On large scales, it enables us to use tracers such as UV or Halpha emission to estimate the sta…
View article: ALMA-IMF XIV: Free-Free Templates Derived from H$41α$ and Ionized Gas Content in Fifteen Massive Protoclusters
ALMA-IMF XIV: Free-Free Templates Derived from H$41α$ and Ionized Gas Content in Fifteen Massive Protoclusters Open
We use the H$41α$ recombination line to create templates of the millimeter free-free emission in the ALMA-IMF continuum maps, which allows to separate it from dust emission. This method complements spectral-index information and extrapolat…
View article: ALMA-IMF XII: Point-process mapping of 15 massive protoclusters
ALMA-IMF XII: Point-process mapping of 15 massive protoclusters Open
A crucial aspect in addressing the challenge of measuring the core mass function, that is pivotal for comprehending the origin of the initial mass function, lies in constraining the temperatures of the cores. We aim to measure the luminosi…
View article: Next Generation Very Large Array Memo #122: Characterization of the synthesized beam with and without MID antennas in Mexico
Next Generation Very Large Array Memo #122: Characterization of the synthesized beam with and without MID antennas in Mexico Open
Synthesized beam (PSF) synthetic observations with and without the antennas in Mexico are analyzed. For a simple continuum observing setup, we generated visibility files and their associated PSF images for a grid of parameters (robust weig…
View article: ALMA-IMF
ALMA-IMF Open
The ALMA-IMF Large Program provides multi-tracer observations of 15 Galactic massive protoclusters at a matched sensitivity and spatial resolution. We focus on the dense gas kinematics of the G353.41 protocluster traced by N 2 H + (1−0), w…
View article: ALMA-IMF
ALMA-IMF Open
Context . A crucial aspect in addressing the challenge of measuring the core mass function (CMF), that is pivotal for comprehending the origin of the initial mass function (IMF), lies in constraining the temperatures of the cores. Aims . W…
View article: ALMA-IMF
ALMA-IMF Open
Context. The star formation process leads to an increased chemical complexity in the interstellar medium. Sites associated with high-mass star and cluster formation exhibit a so-called hot core phase, characterized by high temperatures and…
View article: Investigations of Massive Filaments and Star Formation (INFANT). I. Core Identification and Core Mass Function
Investigations of Massive Filaments and Star Formation (INFANT). I. Core Identification and Core Mass Function Open
Filamentary structures are ubiquitously found in high-mass star-forming clouds. To investigate the relationship between filaments and star formation, we carry out the INFANT (Investigations of Massive Filaments and Sar Formation) survey, a…
View article: Core to ultracompact HII region evolution in the W49A massive protocluster
Core to ultracompact HII region evolution in the W49A massive protocluster Open
Aims. We aim to identify and characterize cores in the high-mass protocluster W49A, determine their evolutionary stages, and measure the associated lifetimes. Methods. We built a catalog of 129 cores extracted from an ALMA 1.3 mm continuum…
View article: INvestigations of massive Filaments ANd sTar formation (INFANT). I. Core Identification and Core Mass Function
INvestigations of massive Filaments ANd sTar formation (INFANT). I. Core Identification and Core Mass Function Open
Filamentary structures are ubiquitously found in high-mass star-forming clouds. To investigate the relationship between filaments and star formation, we carry out the INFANT (INvestigations of massive Filaments ANd sTar formation) survey, …
View article: ALMA-IMF
ALMA-IMF Open
Context. One of the central questions in astrophysics is the origin of the initial mass function (IMF). It is intrinsically linked to the processes from which it originates, and hence its connection with the core mass function (CMF) must b…
View article: Shedding Light on the Ejection History of Molecular Outflows: Multiple Velocity Modes and Precession
Shedding Light on the Ejection History of Molecular Outflows: Multiple Velocity Modes and Precession Open
Variable accretion has been well studied in the evolved stages of low-mass star formation. However, the accretion history in the initial phases of star formation is still a seldom studied topic. The outflows and jets emerging from protoste…
View article: ALMA-IMF X -- The core population in the evolved W33-Main (G012.80) protocluster
ALMA-IMF X -- The core population in the evolved W33-Main (G012.80) protocluster Open
We aimed to measure the CMF in the evolved W33-Main star-forming protocluster to compare it with CMF recently obtained in other Galactic star-forming regions, including the ones included in the ALMA-IMF program. We used observations from t…