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View article: A compact Keplerian-like disc and H30 α emission towards the radio jet in the massive protostar W75N(B)-VLA3
A compact Keplerian-like disc and H30 α emission towards the radio jet in the massive protostar W75N(B)-VLA3 Open
Studying young, high-mass stellar objects is challenging for testing models of massive star formation due to their great distances, often kiloparsecs away. This requires extremely high-angular resolution to resolve features like accretion …
View article: A compact Keplerian-like disc and H30$α$ emission towards the radio jet in the massive protostar W75N(B)-VLA3
A compact Keplerian-like disc and H30$α$ emission towards the radio jet in the massive protostar W75N(B)-VLA3 Open
Studying young, high-mass stellar objects is challenging for testing models of massive star formation due to their great distances, often kiloparsecs away. This requires extremely high-angular resolution to resolve features like accretion …
View article: A search for the favored hyperfine transition of a 6.7 GHz methanol maser line
A search for the favored hyperfine transition of a 6.7 GHz methanol maser line Open
The polarized emission of astrophysical masers, especially OH and methanol lines, is an effective tool to study the magnetic field in high-mass star-forming regions. The magnetic field strength measurement via the Zeeman effect of OH maser…
View article: A search for the favored hyperfine transition of a 6.7 GHz methanol maser line
A search for the favored hyperfine transition of a 6.7 GHz methanol maser line Open
Context . The polarized emission of astrophysical masers, especially OH and CH 3 OH lines, is an effective tool to study the magnetic field in high-mass star-forming regions. The magnetic field strength measurement via the Zeeman effect of…
View article: A multiscale view of the magnetic field morphology in the hot molecular core G31.41+0.31
A multiscale view of the magnetic field morphology in the hot molecular core G31.41+0.31 Open
Multiscale studies of the morphology and strength of the magnetic field are crucial to properly unveil its role and relative importance in high-mass star and cluster formation. G31.41+0.31 (G31) is a hub-filament system that hosts a high-m…
View article: Protostellar Outflows at the EarliesT Stages (POETS)
Protostellar Outflows at the EarliesT Stages (POETS) Open
Context . Understanding the launching mechanism of winds and jets remains one of the fundamental challenges in astrophysics. The Protostellar Outflows at the EarliesT Stages (POETS) survey has recently mapped the 3D velocity field of the p…
View article: Detection of maser emission at 183 and 380 GHz with ALMA in the gigamaser galaxy TXS 2226–184
Detection of maser emission at 183 and 380 GHz with ALMA in the gigamaser galaxy TXS 2226–184 Open
Context. The low-ionization nuclear emission-line region (LINER) galaxy TXS 2226−184 is known to host a very luminous 22 GHz water maser, called a gigamaser at the time of its discovery. To date, the nature of this maser is still being deb…
View article: Detection of maser emission at 183 and 380 GHz with ALMA in the gigamaser galaxy TXS2226-184
Detection of maser emission at 183 and 380 GHz with ALMA in the gigamaser galaxy TXS2226-184 Open
Abridged. The LINER galaxy TXS2226-184 is known to host a very luminous 22 GHz water maser, called a gigamaser at the time of its discovery. To date, the nature of this maser is still being debated, in particular, whether it is associated …
View article: Maser polarization through anisotropic pumping
Maser polarization through anisotropic pumping Open
(Abridged) Polarized emission from masers is an excellent tool to study magnetic fields in maser sources. The linear polarization of most masers is understood as an interplay of maser saturation and anisotropic pumping. However, for the la…
View article: Maser polarization through anisotropic pumping
Maser polarization through anisotropic pumping Open
Context. Polarized emission from masers is an excellent tool to study magnetic fields in maser sources. The linear polarization of the majority of masers is understood as an interplay of maser saturation and anisotropic pumping. However, f…
View article: IC 485: A new candidate disc-maser galaxy at ∼100 Mpc
IC 485: A new candidate disc-maser galaxy at ∼100 Mpc Open
Context. Masers are a unique tool with which to investigate the emitting gas in the innermost regions of active galactic nuclei and to map accretion discs and tori orbiting around supermassive black holes. IC 485, which is classified as a …
View article: The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations
The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations Open
Our goal is to measure and model the magnetic field distribution in the disk wind of the young stellar object (YSO) IRAS 21078+5211. We performed sensitive global Very Long Baseline Interferometry observations of the polarized emission of …
View article: The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations
The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations Open
Context. Although star-formation models predict that the magnetic field plays an important role in regulating disk-mediated accretion and launching and collimating protostellar jets, observations of the magnetic field close enough (within …
View article: IC 485:a new candidate disk-maser galaxy at $\sim$100 Mpc distance. Milliarcsecond resolution study of the galaxy nucleus and of the $H_{2}O$ megamaser
IC 485:a new candidate disk-maser galaxy at $\sim$100 Mpc distance. Milliarcsecond resolution study of the galaxy nucleus and of the $H_{2}O$ megamaser Open
Masers are a unique tool to investigate the emitting gas in the innermost regions of AGNs and to map accretion disks and tori orbiting around supermassive black holes. IC485, which is classified as a LINER or Seyfert galaxy, hosts a bright…
View article: An SiO Toroid and Wide-angle Outflow associated with the Massive Protostar W75N(B)-VLA2
An SiO Toroid and Wide-angle Outflow associated with the Massive Protostar W75N(B)-VLA2 Open
We have carried out ALMA observations of the massive star-forming region W75N(B), which contains the massive protostars VLA1, VLA2, and VLA3. Particularly, VLA2 is an enigmatic protostar associated with a wind-driven H$_2$O maser shell, wh…
View article: An SiO Toroid and Wide-angle Outflow Associated with the Massive Protostar W75N(B)-VLA2
An SiO Toroid and Wide-angle Outflow Associated with the Massive Protostar W75N(B)-VLA2 Open
We have carried out Atacama Large Millimeter/submillimeter Array observations of the massive star-forming region W75N(B), which contains the massive protostars VLA1, VLA2, and VLA3. Particularly, VLA2 is an enigmatic protostar associated w…
View article: Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars
Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars Open
The variability study of 6.7 GHz methanol masers has become a useful way to improve our understanding of the physical conditions in high-mass star-forming regions. Based on the single-dish monitoring using the Irbene telescopes, we selecte…
View article: A Keplerian disk with a four-arm spiral birthing an episodically accreting high-mass protostar
A Keplerian disk with a four-arm spiral birthing an episodically accreting high-mass protostar Open
High-mass protostars (M$_{\star} >$ 8 M$_{\odot}$) are thought to gain the majority of their mass via short, intense bursts of growth. This episodic accretion is thought to be facilitated by gravitationally unstable and subsequently inhomo…
View article: A heat-wave of accretion energy traced by masers in the G358-MM1 high-mass protostar
A heat-wave of accretion energy traced by masers in the G358-MM1 high-mass protostar Open
High-mass stars are thought to accumulate much of their mass via short, infrequent bursts of disk-aided accretion. Such accretion events are rare and difficult to observe directly but are known to drive enhanced maser emission. In this Let…
View article: Monitoring of the polarized H<sub>2</sub>O maser emission around the massive protostars W75N(B)-VLA 1 and W75N(B)-VLA 2
Monitoring of the polarized H<sub>2</sub>O maser emission around the massive protostars W75N(B)-VLA 1 and W75N(B)-VLA 2 Open
Context. Several radio sources have been detected in the high-mass star-forming region W75N(B), with the massive young stellar objects VLA 1 and VLA 2 shown to be of particular interest among them. These objects are thought to be at differ…
View article: Monitoring of the polarized $H_{2}O$ maser emission around the massive protostars W75N(B)-VLA1 and W75N(B)-VLA2
Monitoring of the polarized $H_{2}O$ maser emission around the massive protostars W75N(B)-VLA1 and W75N(B)-VLA2 Open
Several radio sources have been detected in the HMSFR W75N(B), among them the massive YSOs VLA1 and VLA2 are of great interest. These are thought to be in different evolutionary stages. In particular, VLA1 is at the early stage of the phot…
View article: IC 485: A new disk-maser galaxy?
IC 485: A new disk-maser galaxy? Open
Extragalactic maser sources associated with the Active Galactic Nuclei (AGNs), named megamasers, are unique tools to derive fundamental physical quantities of the host galaxies. \nThose associated with accretion disks around the supermassi…
View article: Unveiling fine details of the (giga)maser source in TXS2226-184 with the VLBI
Unveiling fine details of the (giga)maser source in TXS2226-184 with the VLBI Open
In nearby and distant active galactic nuclei (AGNs), water (mega)masers can be used to determine the accretion disk geometry and precise black hole masses, and standard-candles-independent distances to the host galaxy (disk-masers), to pro…
View article: Exploring the radio continuum in megamaser galaxies with the EVN
Exploring the radio continuum in megamaser galaxies with the EVN Open
The origin of the nuclear radio continuum emission in radio quiet AGN, differently from their radio loud counterpart, may be due to multiple physical mechanisms. Moreover, although they constitute the great majority of the AGN population, …
View article: 6.7 GHz CH$_3$OH masers polarization in massive star-forming regions: the Flux-Limited Sample
6.7 GHz CH$_3$OH masers polarization in massive star-forming regions: the Flux-Limited Sample Open
The formation process of high-mass stars (M>8$\rm{M}_{sun}$) is still unclear; this is mainly due to their fast evolution and large distances that make difficult to observe them in details. The observational and theoretical efforts made in…
View article: Overview of the Maser Monitoring Organisation
Overview of the Maser Monitoring Organisation Open
The Maser Monitoring Organisation is a collection of researchers exploring the use of time-variable maser emission in the investigation of astrophysical phenomena. The forward directed aspects of research primarily involve using maser emis…
View article: What’s behind the corner: Maser emission in nearby and distant galaxies with the new radio facilities
What’s behind the corner: Maser emission in nearby and distant galaxies with the new radio facilities Open
Extragalactic maser sources are unique tools to derive fundamental physical quantities of the host galaxies, e.g, geometry of accretion disks around super-massive black holes and precise black hole masses, and study in detail the interacti…
View article: IC 485 : A candidate for a new disk-maser galaxy
IC 485 : A candidate for a new disk-maser galaxy Open
Fundamental physical quantities of the nuclear regions of the Active Galactic Nuclei can be obtained using megamaser studies. In particular, disk-masers associated with accretion disks around the supermassive black holes are used, through …