13CH3OH Masers Associated With a Transient Phenomenon in a High-mass Young Stellar Object

被引：20

作者：

Chen, Xi ^{[1
,2
]}

Sobolev, Andrej M. ^{[3
]}

Breen, Shari L. ^{[4
]}

Shen, Zhi-Qiang ^{[2
]}

Ellingsen, Simon P. ^{[5
]}

MacLeod, Gordon C. ^{[6
,7
]}

Li, Bin ^{[2
]}

Voronkov, Maxim A. ^{[8
]}

Kaczmarek, Jane F. ^{[8
,9
]}

Zhang, Jiangshui ^{[1
]}

Ren, Zhi-Yuan ^{[10
]}

Wang, Jin ^{[1
]}

Linz, Hendrik ^{[11
]}

Hunter, Todd R. ^{[12
]}

Brogan, Crystal ^{[12
]}

Sugiyama, Koichiro ^{[13
]}

Burns, Ross A. ^{[13
,14
]}

Menten, Karl ^{[15
]}

Sanna, Alberto ^{[15
]}

Stecklum, Bringfried ^{[16
]}

Hirota, Tomoya ^{[13
,17
]}

Kim, Kee-Tae ^{[14
]}

Chibueze, James ^{[18
,19
]}

van den Heever, S. P. ^{[6
]}

机构：

[1] Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China

[2] Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China

[3] Ural Fed Univ, 19 Mira St, Ekaterinburg 620002, Russia

[4] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

[5] Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001, Australia

[6] Hartebeesthoek Radio Astron Observ, POB 443, ZA-1741 Krugersdorp, South Africa

[7] Univ Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada

[8] Australia Telescope Natl Facil, CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia

[9] CSIRO Parkes Observ, CSIRO Astron & Space Sci, POB 276, Parkes, NSW 2870, Australia

[10] Chinese Acad Sci, Natl Astron Observ, Datun Rd A20, Beijing, Peoples R China

[11] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[12] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA

[13] Natl Astron Observ Japan NAOJ, Mizusawa VLBI Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[14] Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea

[15] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[16] Thuringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany

[17] SOKENDAI Grad Univ Adv Studies, Dept Astron Sci, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan

[18] North West Univ, Phys Dept, Space Res Unit, ZA-2520 Potchefstroom, South Africa

[19] Univ Nigeria, Fac Phys Sci, Dept Phys & Astron, Carver Bldg,1 Univ Rd, Nsukka, Nigeria

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2020年 / 890卷 / 02期

基金：

俄罗斯科学基金会; 中国国家自然科学基金;

关键词：

II METHANOL MASERS; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; TRANSITIONS; BURST;

D O I：

10.3847/2041-8213/ab72a5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first detection of isotopic methanol ((CH3OH)-C-13) 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 (CH3OH)-C-13 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 (CH3OH)-C-13 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.

引用

页数：8

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