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New maser species tracing spiral-arm accretion flows in a high-mass young stellar object
Citation
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
Abstract
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: | 7 |
| Deposited By: | Physics |
| Deposited On: | 2020-07-27 |
| Last Modified: | 2020-08-05 |
| Downloads: | 0 |
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