Studying star-forming processes at core and clump scales: the case of the young stellar object G29.862-0.0044

Abstract

Massive molecular clumps fragment into cores where star formation takes place, hence star-forming studies should be done at different spatial scales. Using near-IR data obtained with Gemini, data of CH3OCHO and CH3CN from the ALMA database, observations of HCN, HNC, HCO+, and C2H carried out with ASTE, and CO data from public surveys, we perform a deep study of the YSO G29.86-0.004 at core and clump spatial scales. The near-IR emission shows two nebulosities separated by a dark lane, suggesting a typical disk-jets system, but highly asymmetric. They are likely produced by scattered light in cavities carved out by jets on an infalling envelope of material, which also present line emission of H2 and [FeII]. The presence of the complex molecular species observed with ALMA confirms that we are mapping a hot molecular core. The CH3CN emission concentrates at the position of the dark lane and it appears slightly elongated from southwest to northeast in agreement with the inclination of the system as observed at near-IR. The morphology of the CH3OCHO emission is more complex and extends along some filaments and concentrates in knots and clumps, mainly southwards the dark-lane, suggesting that the southern jet is encountering a dense region. The northern jet flows more freely, generating more extended features. This is in agreement with the red-shifted molecular outflow traced by the 12CO J=3-2 line extending towards the northwest and the lack of a blue-shifted outflow. This configuration can be explained by considering that the YSO is located at the furthest edge of the molecular clump along the line of sight, which is consistent with the position of the source in the cloud mapped in the C18O J=3-2 line. The detection of HCN, HNC, HCO+, and C2H allowed us to characterize the dense gas at clump scales, yielding results that are in agreement with the presence of a high-mass protostellar object.

Accepted to be published in A&A (July 13, 2020)

References in corpus (15)

• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• ATLASGAL --- towards a complete sample of massive star forming clumps
• Multi-temperature mapping of dust structures throughout the Galactic Plane using the PPMAP tool with Herschel Hi-GAL data
• The Luminosity Functions and Timescales of MYSOs and Compact HII regions
• The HNC/HCN Ratio in Star-Forming Regions
• HCN/HNC intensity ratio: a new chemical thermometer for the molecular ISM
• Ethynyl (C2H) in massive star formation: Tracing the initial conditions?
• VLT K-band spectroscopy of massive young stellar objects in (ultra-)compact HII regions
• The ALMA View of the OMC1 Explosion in Orion
• The Physical and chemical structure of Sagittarius B2 -- IV. Converging filaments in the high-mass cluster forming region Sgr B2(N)
• C${}_2$H observations toward the Orion Bar
• Candidate Rotating Toroids around High-Mass (Proto)Stars
• Spatially resolved near-infrared spectroscopy of the massive star-forming region IRAS 19410+2336
• Ammonia and CO Outflow around 6.7 GHz Methanol Masers
• Massive young stellar object W42-MME: The discovery of an infrared jet using VLT/NACO near-infrared images

Cited by in corpus (5)

• Cyano radical emission at small spatial scales towards massive protostars
• Studying a precessing jet of a massive young stellar object within a chemically rich region
• Extended Ionized Fe Objects in the UWIFE Survey
• Unveiling the substructure of the massive clump AGAL G035.1330$-$00.7450
• Revisiting G29.862-0.0044: a jet cavity disrupted by an outflow in a likely young stellar object wide binary system