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A Search for High-mass Protostellar Objects in Cold IRAS Sources
Ao, Y.1,2,3; Yang, J.1,2; Tatematsu, K.3; Henkel, C.4,5; Sunada, K.6; Nguyen-Luong, Q.3,7
2018-11-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume156Issue:5Pages:14
Corresponding AuthorAo, Y.()
AbstractWe present the results of CS J = 2 -> 1 mapping observations toward 39 massive star-forming regions selected from the previous CO line survey of cold IRAS sources with high-velocity CO flows along the Galactic plane. All sources are detected in CS J = 2 -> 1, showing the existence of CS clumps around the IRAS sources. However, one-third of the sources are not deeply embedded in the dense clumps by comparison of the central powering IRAS sources and the morphologies of CS clumps. Physical parameters of the dense molecular clumps are presented. We have identified 12 high-mass protostellar object (HMPO) candidates by checking the association between the dense cores and the IRAS sources, the detection of water maser, and the radio properties toward the IRAS sources. We find that the HMPO sources are characterized by low FIR luminosity to virial mass ratios since they are in very early evolutionary stages when the massive protostars have not reached their full luminosities, which are typical for zero-age main-sequence stars. Large turbulent motion in the HMPO sources may be largely due to the large kinetic energy ejected by the central protostars formed in the dense clumps. However, alternative means or undetected outflows may also be responsible for the turbulence in the clumps.
KeywordISM: clouds ISM: molecules stars: formation stars: massive stars: protostars
DOI10.3847/1538-3881/aae259
WOS KeywordDENSE MOLECULAR CORES ; STAR-FORMING REGIONS ; H-II REGIONS ; DISTANCE-LIMITED SAMPLE ; SOUTHERN H2O MASERS ; RMS SURVEY ; TRIGONOMETRIC PARALLAXES ; WATER MASER ; (CO)-C-13 OBSERVATIONS ; PHYSICAL PARAMETERS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000460100400010
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23804
Collection中国科学院紫金山天文台
Corresponding AuthorAo, Y.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
3.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
4.MPIfR, Hugel 69, D-53121 Bonn, Germany
5.King Abdulaziz Univ, Astron Dept, POB 80203, Jeddah 21589, Saudi Arabia
6.NAOJ, Mizusawa VLBI Observ, Mizusawa Ku, 2-12 Hoshi Ga Oka, Oshu, Iwate 0230861, Japan
7.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
Recommended Citation
GB/T 7714
Ao, Y.,Yang, J.,Tatematsu, K.,et al. A Search for High-mass Protostellar Objects in Cold IRAS Sources[J]. ASTRONOMICAL JOURNAL,2018,156(5):14.
APA Ao, Y.,Yang, J.,Tatematsu, K.,Henkel, C.,Sunada, K.,&Nguyen-Luong, Q..(2018).A Search for High-mass Protostellar Objects in Cold IRAS Sources.ASTRONOMICAL JOURNAL,156(5),14.
MLA Ao, Y.,et al."A Search for High-mass Protostellar Objects in Cold IRAS Sources".ASTRONOMICAL JOURNAL 156.5(2018):14.
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