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A Mini Survey of Methyl Cyanide toward Extended Green Objects
Hung, T.1,2; Liu, Sheng-Yuan2; Su, Yu-Nung2; He JH(何金华)3,4,5; Lee, Hsu-Tai2,6; Takahashi, Satoko2,7,8; Chen, Huei-Ru9
Source PublicationASTROPHYSICAL JOURNAL
2019-02-10
Volume872Issue:1Pages:20
DOI10.3847/1538-4357/aafc23
Contribution Rank第3完成单位
Indexed BySCI
KeywordISM: general stars: formation submillimeter: ISM
Abstract

We present results of a survey of methyl cyanide (CH3CN) J = 12-11 toward 56 sources, including 35 Extended Green Objects (EGOs) and 21 nearby AKARI counterparts, with the Submillimeter Telescope (SMT) in order to characterize the nature of EGOs. CH3CN, a tracer of hot core emission, is detected in 19 EGOs (similar to 54%) and five AKARI bright sources (similar to 24%). By analyzing the observed CH3CN features, we find an average line width of 6.5 km s(-1). For the sources detected with CH3CN, we derive CH3CN column densities log(10)(N[cm(-2)]) = 14-17 with gas temperatures in the range 40-300 K. The small filling factors (10(-2)-10(-4)) may reflect the rather compact CH3CN emitting regions, which correspond to linear sizes of similar to 0.01-0.08 pc. We also estimate the virial masses and gas masses of these sources. Our derived gas masses are lower than the virial masses, possibly because CH3CN traces more energetic motions such as outflows and shocks. Alternatively, we cannot rule out that the virial masses are overestimated due to the presence of unresolved CH3CN kinetic components, such as the rotation structures observed around the young stellar objects.

Funding ProjectNSF of China[11873086] ; NSF of China[U1631237] ; Yunnan province[2017HC018] ; Chinese Academy of Sciences (CAS)
Funding OrganizationNSF of China[11873086, U1631237] ; Yunnan province[2017HC018] ; Chinese Academy of Sciences (CAS)
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000458369900008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMETHANOL MASERS ; STAR ; OUTFLOWS ; HOT ; SEARCH ; EMISSION ; CATALOG ; CORES ; CH3CN ; ORION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/19326
Collection大样本恒星演化研究组
Corresponding AuthorHung, T.
Affiliation1.Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
2.Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan
3.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China
4.Chinese Academy of Sciences South America Center for Astronomy, China–Chile Joint Center for Astronomy, Camino El Observatorio #1515, Las Condes, Santiago, Chile
5.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
6.National Chung Cheng University, No. 168, Sec. 1, University Road, Minhsiung, Chiayi 62102, Taiwan
7.NAOJ Chile Observatory, Alonso de Córdova 3788, Oficina 61B, Vitacura, Santiago, Chile
8.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
9.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
Recommended Citation
GB/T 7714
Hung, T.,Liu, Sheng-Yuan,Su, Yu-Nung,et al. A Mini Survey of Methyl Cyanide toward Extended Green Objects[J]. ASTROPHYSICAL JOURNAL,2019,872(1):20.
APA Hung, T..,Liu, Sheng-Yuan.,Su, Yu-Nung.,He JH.,Lee, Hsu-Tai.,...&Chen, Huei-Ru.(2019).A Mini Survey of Methyl Cyanide toward Extended Green Objects.ASTROPHYSICAL JOURNAL,872(1),20.
MLA Hung, T.,et al."A Mini Survey of Methyl Cyanide toward Extended Green Objects".ASTROPHYSICAL JOURNAL 872.1(2019):20.
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