13CH3OH Masers Associated With a Transient Phenomenon in a High-mass Young Stellar Object
| Autor: | Crystal L. Brogan, Zhi Yuan Ren, Kee-Tae Kim, Jiangshui Zhang, Alberto Sanna, Bin Li, Simon Ellingsen, Maxim Voronkov, Ross A. Burns, Jane Kaczmarek, Jin Wang, James O. Chibueze, Xi Chen, Tomoya Hirota, Shari Breen, Koichiro Sugiyama, G. C. MacLeod, Sp Van Den Heever, Hendrik Linz, Zhi-Qiang Shen, Todd R. Hunter, Andrej M. Sobolev, Karl M. Menten, Bringfried Stecklum |
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| Přispěvatelé: | 29697492 - Chibueze, James Okwe |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena Young stellar object Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Spatial distribution 01 natural sciences law.invention Interstellar masers Stellar accretion disks law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Maser 010303 astronomy & astrophysics Stellar evolution Astrophysics::Galaxy Astrophysics Astrophysical masers 0105 earth and related environmental sciences Physics Microwave amplifiers Star formation Radiation field Astronomy and Astrophysics Interstellar molecules Space and Planetary Science Flare |
| Zdroj: | Astrophys. J. Lett. Astrophysical Journal Letters |
| ISSN: | 2041-8213 |
| DOI: | 10.3847/2041-8213/ab72a5 |
| Popis: | We report the first detection of isotopic methanol (13CH3OH) maser emission in interstellar space. The emission was detected toward the high-mass young stellar object G358.93-0.03 during monitoring of a flare in the 6.7 GHz methanol (CH3OH) maser emission in this source. We find that the spectral and spatial distribution of the 13CH3OH masers differs from the CH3OH masers imaged at the same epoch, contrary to expectations from similarity of their pumping. This conclusively demonstrates that isotopic methanol masers are bright under different physical conditions and suggests that they can provide additional, complementary information to the CH3OH masers from the same source. We detect a rapid decay of the 13CH3OH maser lines suggesting that they are transient phenomena (masing for only a few months), likely associated with rapid changes in radiation field due to an accretion burst induced by massive disk fragmentation. Changes in the line flux density are faster than required to achieve equilibrium in the energy level populations, indicating that the pumping of these masers is likely variable. © 2020. The American Astronomical Society. All rights reserved.. |
| Databáze: | OpenAIRE |
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