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Protostellar Outflows at the EarliesT Stages (POETS). VII. Circumstellar gas kinematics traced by water masers inside the HC HII region NGC7538 IRS1
Luca Moscadelli, Ciriaco Goddi, Tomoya Hirota +1
This article focuses on NGC7538 IRS1, one of the most luminous and studied HC HII regions in the northern hemisphere. Our aim is to identify the young stellar objects (YSOs) embedd…
The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations
Luca Moscadelli, André Oliva, Gabriele Surcis +3
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 Baselin…
The SOUL view of IRAS20126+4104. Kinematics and variability of the H jet from a massive protostar
F. Massi, A. Caratti o Garatti, R. Cesaroni +20
We exploit the increased sensitivity of the recently installed AO SOUL at the LBT to obtain new high-spatial-resolution NIR images of the massive young stellar object IRAS20126+410…
Snapshot of a magnetohydrodynamic disk wind traced by water maser observations
Luca Moscadelli, Alberto Sanna, Henrik Beuther +2
The formation of astrophysical objects of different nature and size, from black holes to gaseous giant planets, involves a disk-jet system, where the disk drives the mass accretion…
Resolving the collimation zone of an intermediate-mass protostar
Adriana R. Rodríguez-Kamenetzky, Carlos Carrasco-González, Luis Felipe Rodríguez Jorge +12
We report new VLA and e-MERLIN high resolution and sensitivity images of the Triple Radio continuum Source in the Serpens star forming region. These observations allowed us to perf…
Zooming into the Collimation Zone in a Massive Protostellar Jet
Carlos Carrasco-González, Alberto Sanna, Adriana Rodríguez-Kamenetzky +5
Protostellar jets have a fundamental role at the earliest evolution of protostars of all masses. In the case of low-mass (<8 Msun) protostars, strong observational evidence exists…
Protostellar Outflows at the EarliesT Stages (POETS). IV. Statistical properties of the 22 GHz H2O masers
Luca Moscadelli, Alberto Sanna, Ciriaco Goddi +3
We wish to perform a statistical study of the location and motion of individual 22 GHz water maser cloudlets, characterized by sizes that are within a few au, with respect to the r…
Protostellar Outflows at the EarliesT Stages (POETS). III. H2O masers tracing disk-winds and jets near luminous YSOs
Luca Moscadelli, Alberto Sanna, Ciriaco Goddi +3
The goal of the Protostellar Outflows at the EarliesT Stages (POETS) survey is to image the disk-outflow interface on scales of 10-100 au in a statistically significant sample (36)…
Measuring the ionisation fraction in a jet from a massive protostar
R. Fedriani, A. Caratti o Garatti, S. J. D. Purser +7
It is important to determine if massive stars form via disc accretion, like their low-mass counterparts. Theory and observation indicate that protostellar jets are a natural conseq…
Sub-arcsecond (sub)millimeter imaging of the massive protocluster G358.93-0.03: Discovery of 14 new methanol maser lines associated with a hot core
C. L. Brogan, T. R. Hunter, A. P. M. Towner +25
We present (sub)millimeter imaging at 0.5'' resolution of the massive star-forming region G358.93-0.03 acquired in multiple epochs at 2 and 3 months following the recent flaring of…
Understanding Accretion Outbursts in Massive Protostars through Maser Imaging
Todd R. Hunter, Anna Bartkiewicz, Walter Brisken +8
The bright maser emission produced by several molecular species at centimeter to long millimeter wavelengths provides an essential tool for understanding the process of massive sta…
Protostellar Outflows at the EarliesT Stages (POETS). II. A possible radio synchrotron jet associated with the EGO G035.02+0.35
A. Sanna, L. Moscadelli, C. Goddi +7
Centimeter continuum observations of protostellar jets have revealed the presence of knots of shocked gas where the flux density decreases with frequency. This spectrum is characte…
A 10- YSO with a Keplerian disk and a nonthermal radio jet
Luca Moscadelli, Alberto Sanna, Riccardo Cesaroni +3
We previously observed the star-forming region G16.590.05 through interferometric observations of both thermal and maser lines, and identified a high-mass young stellar object (…
Protostellar Outflows at the EarliesT Stages (POETS). I. Radio thermal jets at high resolution nearby HO maser sources
A. Sanna, L. Moscadelli, C. Goddi +2
Abridged. Methods. We made use of the Karl G. Jansky Very Large Array (VLA) in the B configuration at K band, and in the A configuration at both Ku and C bands, in order to image t…
Discovery of a sub-Keplerian disk with jet around a 20Msun young star. ALMA observations of G023.01-00.41
A. Sanna, A. Koelligan, L. Moscadelli +9
It is well established that Solar-mass stars gain mass via disk accretion, until the mass reservoir of the disk is exhausted and dispersed, or condenses into planetesimals. Accreti…
Radio outburst from a massive (proto)star. When accretion turns into ejection
R. Cesaroni, L. Moscadelli, R. Neri +6
Context. Recent observations of the massive young stellar object S255 NIRS 3 have revealed a large increase in both methanol maser flux density and IR emission, which have been int…
A revised distance to IRAS 162932422 from VLBA astrometry of associated water masers
S. A. Dzib, G. N. Ortiz-León, A. Hernández-Gómez +6
IRAS 16293-2422 is a very well studied young stellar system seen in projection towards the L1689N cloud in the Ophiuchus complex. However, its distance is still uncertain with a ra…
Infrared variability, maser activity, and accretion of massive young stellar objects
B. Stecklum, A. Caratti o Garatti, K. Hodapp +3
Methanol and water masers indicate young stellar objects. They often exhibit flares, and a fraction shows periodic activity. Several mechanisms might explain this behavior but the…
Disk-mediated accretion burst in a high-mass young stellar object
A. Caratti o Garatti, B. Stecklum, R. Garcia Lopez +13
Solar-mass stars form via circumstellar disk accretion (disk-mediated accretion). Recent findings indicate that this process is likely episodic in the form of accretion bursts, pos…
Tracing jet emission at the base of a high-mass YSO. First AMBER/VLTI observations of the Brγemission in IRAS 13481-6124
A. Caratti o Garatti, B. Stecklum, G. Weigelt +9
To probe the circumstellar environment of IRAS 13481-6124, a 20 M_sun high-mass young stellar object (HMYSO) with a parsec-scale jet and accretion disc, we investigate the origin o…
Velocity and magnetic fields within 1000 AU from a massive YSO
A. Sanna, G. Surcis, L. Moscadelli +4
We want to study the velocity and magnetic field morphology in the vicinity (<1000 AU) of a massive young stellar object (YSO), at very high spatial resolution (10-100 AU). We perf…
A near-IR spectroscopic survey of massive jets towards EGOs
A. Caratti o Garatti, B. Stecklum, H. Linz +2
We aim at deriving the main physical properties of massive jets from near-IR observations, comparing them to those of a large sample of jets from low-mass YSOs, and relating them t…
A study on subarcsecond scales of the ammonia and continuum emission toward the G16.59-0.05 high-mass star-forming region
L. Moscadelli, R. Cesaroni, Á. Sánchez-Monge +4
We wish to investigate the structure, velocity field, and stellar content of the G16.59-0.05 high-mass star-forming region, where previous studies have established the presence of…
A Double-Jet System in the G31.41+0.31 Hot Molecular Core
Luca Moscadelli, Jing Jing Li, Riccardo Cesaroni +3
This work presents a detailed study of the gas kinematics towards the "Hot Molecular Core" (HMC) G31.41+0.31 via multi-epoch VLBI observations of the H2O 22 GHz and CH3OH 6.7 GHz m…