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题名: DETECTION OF 36 GHz CLASS I METHANOL MASER EMISSION TOWARD NGC 253
作者: Ellingsen, Simon P.1; Chen, Xi2, 3; Qiao, Hai-Hua2, 4; Baan, Willem2; An, Tao2, 3; Li, Juan2, 3; Breen, Shari L.5
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2014-08-01
卷号: 790, 期号:2
关键词: galaxies: individual (NGC 253) ; galaxies: starburst ; masers ; radio lines: ISM
DOI: 10.1088/2041-8205/790/2/L28
文章类型: Article
英文摘要: We have used the Australia Telescope Compact Array to search for emission from the 4-1 -> 3(0)E transition of methanol (36.2 GHz) toward the center of the nearby starburst galaxy NGC 253. Two regions of emission were detected, offset from the nucleus along the same position angle as the inner spiral arms. The emission is largely unresolved on a scale of 5", has a FWHM line width of < 30 km s(-1), and an isotropic luminosity orders of a magnitude larger than that observed in any Galactic star formation region. These characteristics suggest that the 36.2 GHz methanol emission is most likely a maser, although observations with higher angular and spectral resolution are required to confirm this. If it is a maser, this represents the first detection of a class I methanol maser outside the Milky Way. The 36.2 GHz methanol emission in NGC 253 has more than an order of magnitude higher isotropic luminosity than the widespread emission recently detected toward the center of the Milky Way. If emission from this transition scales with the nuclear star formation rate, then it may be detectable in the central regions of many starburst galaxies. Detection of methanol emission in ultra-luminous infrared galaxies would open up a new tool for testing for variations in fundamental constants (particularly the proton-to-electron mass ratio) on cosmological scales.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STARBURST GALAXY NGC-253 ; EXTRAGALACTIC METHANOL ; SUPERNOVA-REMNANTS ; NEARBY GALAXIES ; CH3OH MASER ; SEARCH ; TRANSITIONS ; ABSORPTION ; REGIONS ; GAS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000339897100014
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15750
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Univ Tasmania, Sch Phys Sci, Hobart, Tas, Australia
2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
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