Ciriaco Goddi

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We present multi-epoch Very Long Baseline Array imaging of the 28SiO v = 1 and v = 2, J = 1–0 maser emission toward the massive young stellar object (YSO) Orion Source I. Both SiO transitions were observed simultaneously with an angular resolution of ∼0.5 mas (∼0.2 AU for d = 414 pc) and a spectral resolution of ∼0.2 km s−1. Here we explore the global(More)
Context. In high-mass (≥7 M ) star formation (SF) studies, high-angular resolution is crucial for resolving individual protostellar outflows (and possibly accretion disks) from the complex contribution of nearby (highand low-mass) young stellar objects (YSO). Previous interferometric studies have focused mainly on single objects. Aims. A sensitive survey at(More)
We have used the Very Large Array (VLA) at 7 mm wavelength to image five rotational transitions (J = 1 − 0) from three SiO isotopologues towards Orion BN/KL: SiO v = 0, 1, 2; and SiO and SiO v = 0. For the first time, we have mapped the SiO and SiO J = 1− 0 emission, established the maser nature of the emission, and confirmed association with the deeply(More)
The current paradigm of star formation through accretion disks, and magnetohydrodynamically driven gas ejections, predicts the development of collimated outflows, rather than expansion without any preferential direction. We present radio continuum observations of the massive protostar W75N(B)-VLA 2, showing that it is a thermal, collimated ionized wind and(More)
Context. Magnetic fields are invoked to launch, drive, and shape jets in both lowand high-mass protostars, but observational data on the spatial scales required to assess their role in the protostellar mass-loss process is still scarce. Aims. The Turner-Welch (TW) Object in the W3(OH) high-mass star forming complex drives a synchrotron jet, which is quite(More)
Aims. 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). Methods. We performed milli-arcsecond polarimetric observations of the strong CH3OH maser emission observed in the vicinity of an O-type YSO, in G023.01−00.41. We have combined(More)
We present new JVLA observations of the high-mass cluster-forming region W51A from 2 to 16 GHz with resolution θfwhm ≈ 0.3−0.5′′. The data reveal a wealth of observational results: (1) Currently forming, very massive (proto-O) stars are traced by o-H2CO 21,1−21,2 emission, suggesting that this line can be used efficiently as a massive protostar tracer; (2)(More)
We have conducted multi-epoch EVN observations of the 22.2 GHz water masers towards the high-mass young stellar object in AFGL 5142. With four observing epochs, spanning a time of ∼1 year, 12 distinct maser features have been detected, 7 out of these detected in more than one epoch. The positions and the velocities of the VLBI features agree well with those(More)
We have conducted phase-reference multi-epoch observations of the 22.2 GHz water masers using the Very Long Baseline Array (VLBA) and multi-frequency study of the continuum emission using the Very Large Array (VLA) towards the high-mass star forming region (SFR) AFGL 5142. 29 maser features were identified and most of them were persistent over the four(More)