Discovery of a New Class I Methanol Maser Transition at 266.8 GHz
Chen, Xi1,2; Ellingsen, Simon P.3; Ren, Zhi-Yuan4; Sobolev, Andrej M.5; Parfenov, Sergey5; Shen, Zhi-Qiang2,6
Corresponding AuthorChen, Xi(
AbstractWe report the detection of a new class I methanol maser candidate from the 5(2)-4(1) E transition (266.8 GHz). This methanol transition has been detected toward a nearby high-mass star-forming region G352.630-1.067 (distance similar to 0.7 kpc), in Submillimeter Array (SMA) observations. The new candidate transition has a similar spatial distribution as the 4(2)-3(1) E (218.4 GHz) and 8(-1)-7(0) E (229.7 GHz) transitions, which are known class I maser transitions. Thermal methanol emission in this source is confined to a central hot core, while the three class I maser transitions are detected in two additional regions. These two maser-only emission regions are clearly associated with shocked gas traced by 2 mu m Ks-band and thermal v = 0, J = 5-4 SiO molecular emission. In contrast to the thermal methanol emission from the hot core, the three class I maser transitions show an positive trend in the rotation diagram for the two maser regions. Large velocity gradient modeling of the 266.8, 218.4, and 229.7 GHz transitions shows that the 266.8 GHz transition can be a maser for a wide range of conditions. The intensity ratios for the three methanol transitions detected in maser regions can be reproduced under conditions that are typical for class I methanol maser sites. These facts all support the hypothesis that the detected emission from the 266.8 GHz methanol (5(2)-4(1) E) transition is masing.
KeywordISM: jets and outflows ISM: molecules masers stars: formation
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000469801600008
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Document Type期刊论文
Corresponding AuthorChen, Xi
Affiliation1.GuangZhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
3.Univ Tasmania, Sch Nat Sci, Hobart, Tas 7001, Australia
4.Chinese Acad Sci, Natl Astron Observ, Datun Rd A20, Beijing, Peoples R China
5.Ural Fed Univ, 19 Mira St, Ekaterinburg 620002, Russia
6.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
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GB/T 7714
Chen, Xi,Ellingsen, Simon P.,Ren, Zhi-Yuan,et al. Discovery of a New Class I Methanol Maser Transition at 266.8 GHz[J]. ASTROPHYSICAL JOURNAL,2019,877(2):8.
APA Chen, Xi,Ellingsen, Simon P.,Ren, Zhi-Yuan,Sobolev, Andrej M.,Parfenov, Sergey,&Shen, Zhi-Qiang.(2019).Discovery of a New Class I Methanol Maser Transition at 266.8 GHz.ASTROPHYSICAL JOURNAL,877(2),8.
MLA Chen, Xi,et al."Discovery of a New Class I Methanol Maser Transition at 266.8 GHz".ASTROPHYSICAL JOURNAL 877.2(2019):8.
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