13CH3OH Masers Associated With a Transient Phenomenon in a High-mass Young Stellar Object
Date Issued
2020
Author(s)
Chen, Xi
•
Sobolev, Andrej M.
•
Breen, Shari L.
•
Shen, Zhi-Qiang
•
Ellingsen, Simon P.
•
MacLeod, Gordon C.
•
Li, Bin
•
Voronkov, Maxim A.
•
Kaczmarek, Jane F.
•
Zhang, Jiangshui
•
Ren, Zhi-Yuan
•
Wang, Jin
•
Linz, Hendrik
•
Hunter, Todd R.
•
Brogan, Crystal
•
Sugiyama, Koichiro
•
Burns, Ross A.
•
Menten, Karl
•
•
Stecklum, Bringfried
•
Hirota, Tomoya
•
Kim, Kee-Tae
•
Chibueze, James
•
Heever, SP van den
Abstract
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.
Volume
890
Issue
2
Start page
L22
Issn Identifier
2041-8205
Ads BibCode
2020ApJ...890L..22C
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
Chen_2020_ApJL_890_L22.pdf
Description
Pdf editoriale
Size
811.46 KB
Format
Adobe PDF
Checksum (MD5)
833ac35a9391e0cef9d6b49d41ddf3ab