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New maser species tracing spiral-arm accretion flows in a high-mass young stellar object


Chen, X and Sobolev, AM and Ren, ZY and Parfenov, S and Breen, SL and Ellingsen, SP and Shen, Z-Q and Li, B and MacLeod, GC and Baan, W and Brogan, C and Hirota, T and Hunter, TR and Linz, H and Menten, K and Sugiyama, K and Stecklum, B and Gong, Y and Zheng, X, New maser species tracing spiral-arm accretion flows in a high-mass young stellar object, Nature Astronomy pp. 1-8. ISSN 2397-3366 (2020) [Refereed Article]

Copyright Statement

The Author(s), under exclusive licence to Springer Nature Limited 2020

DOI: doi:10.1038/s41550-020-1144-x


Numerical simulations have predicted that substructures such as spiral arms can be produced through a gravitationally unstable disk around high-mass young stellar objects (HMYSOs). Recent high-resolution observations from the Atacama Large Millimeter/submillimeter Array have investigated these substructures at a spatial resolution of ∼100 au. An accretion burst, which is a manifestation of an increase in the accretion rate caused by a gravitational instability in the disk, can result in luminosity outbursting phenomena - as has been seen in several HMYSOs. However, no clear relationship between the accretion bursts and disk substructures has been established. Here we report the detections of three new molecular maser species, HDO, HNCO and 13CH3OH, from the direction of the HMYSO G358.93-0.03 during a 6.7 GHz methanol maser flaring event. High-quality imaging of the three new maser species exhibits consistent observational evidence that these masers closely trace the spiral-arm substructures around this HMYSO. The rapid decay of the spectral lines emitted from these molecules suggests that these are transient phenomena (for only ∼1 month), probably associated with rapid changes in radiation field due to an accretion burst. Therefore, these new maser species provide evidence linking the spiral-arm substructure with an accretion burst, both expected from massive disk instabilities.

Item Details

Item Type:Refereed Article
Keywords:SM: individual objects (G358.931-0.030) ISM: molecules masers radio lines: ISM stars: formation
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:140101
Year Published:2020
Funding Support:Australian Research Council (DP180101061)
Web of Science® Times Cited:11
Deposited By:Physics
Deposited On:2020-07-27
Last Modified:2020-08-05

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