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题名: DETECTION OF A METHANOL MEGAMASER IN A MAJOR-MERGER GALAXY
作者: Chen, Xi1, 2; Ellingsen, Simon P.3; Baan, Willem A.1; Qiao, Hai-Hua1, 4; Li, Juan1, 2; An, Tao1, 2; Breen, Shari L.5
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2015-02-10
卷号: 800, 期号:1
关键词: ISM: molecules ; masers ; stars: formation
DOI: 10.1088/2041-8205/800/1/L2
文章类型: Article
英文摘要: We have detected emission from both the 4(-1) -> 3(0) E (36.2 GHz) class I and 7(-2) -> 8(-1)E (37.7 GHz) class II methanol transitions toward the center of the closest ultra-luminous infrared galaxy Arp 220. The emission in both methanol transitions shows narrow spectral features and has luminosities approximately 8 orders of magnitude stronger than those observed from typical class I methanol masers observed in Galactic star formation regions. The emission is also orders of magnitude stronger than the expected intensity of thermal emission from these transitions and based on these findings we suggest that the emission from the two transitions are masers. These observations provide the first detection of a methanol megamaser in the 36.2 and 37.7 GHz transitions and represent only the second detection of a methanol megamaser, following the recent report of an 84 GHz methanol megamaser in NGC 1068. We find that the methanol megamasers are significantly offset from the nuclear region and arise toward regions where there is Ha emission, suggesting that they are associated with starburst activity. The high degree of correlation between the spatial distribution of the 36.2 GHz methanol and X-ray plume emission suggests that the production of strong extragalactic class I methanol masers is related to galactic-outflow-driven shocks and perhaps cosmic rays. In contrast to OH and H2O megamasers which originate close to the nucleus, methanol megamasers provide a new probe of feedback (e.g., outflows) processes on larger scales and of star formation beyond the circumnuclear starburst regions of active galaxies.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: ARP 220 ; MASERS ; SEARCH ; ARP-220 ; DISCOVERY ; EMISSION ; RADIO ; LINES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000349316000002
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15779
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.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Tasmania, Sch Phys Sci, Hobart, Tas, Australia
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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