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A Large-field J=1-0 Survey of CO and Its Isotopologues toward the Cassiopeia A Supernova Remnant
Ma, Yuehui1,2,3; Wang, Hongchi1,2; Zhang, Miaomiao1,2,4; Li, Chong1,2,3; Yang, Ji1,2
2019-06-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume878Issue:1Pages:18
Corresponding AuthorMa, Yuehui(mayh@pmo.ac.cn)
AbstractWe have conducted a large-field simultaneous survey of (CO)-C-12, (CO)-C-13, and (CO)-O-18 J = 1 - 0 emission toward the Cassiopeia A (Cas A) supernova remnant (SNR), which covers a sky area of 3 degrees.5 x 3 degrees.1. The Cas giant molecular cloud (GMC) mainly consists of three individual clouds with masses on the order of 10(4)-10(5) M-circle dot. The total mass derived from the (CO)-C-13 emission of the GMC is 2.1 x 10(5) M-circle dot and is 9.5 x 10(5) M-circle dot from the (CO)-C-12 emission. Two regions with broadened (6-7 km s(-1)) or asymmetric (CO)-C-12 line profiles are found in the vicinity (within a 10' x 10' region) of the Cas A SNR, indicating possible interactions between the SNR and the GMC. Using the GAUSSCLUMPS algorithm, 547 (CO)-C-13 clumps are identified in the GMC, 54% of which are supercritical (i.e., alpha(vir) < 2). The mass spectrum of the molecular clumps follows a power-law distribution with an exponent of -2.20. The pixel-by-pixel column density of the GMC can be fitted with a log-normal probability distribution function (N-PDF). The median column density of molecular hydrogen in the GMC is 1.6 x 10 (21) cm(-2) and half the mass of the GMC is contained in regions with H-2 column density lower than 3 x 10(21) cm(-2), which is well below the threshold of star formation. The distribution of the YSO candidates in the region shows no agglomeration.
KeywordISM: clouds ISM: individual objects (Cas A) ISM: supernova remnants stars: formation surveys
DOI10.3847/1538-4357/ab1ea7
WOS KeywordMASS-SIZE RELATION ; MOLECULAR CLOUDS ; STAR-FORMATION ; A SUPERNOVA ; DENSITY DISTRIBUTION ; GAS ; EVOLUTION ; DISCOVERY ; PROGENITOR ; DIRECTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000471316800007
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27550
Collection中国科学院紫金山天文台
Corresponding AuthorMa, Yuehui
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Recommended Citation
GB/T 7714
Ma, Yuehui,Wang, Hongchi,Zhang, Miaomiao,et al. A Large-field J=1-0 Survey of CO and Its Isotopologues toward the Cassiopeia A Supernova Remnant[J]. ASTROPHYSICAL JOURNAL,2019,878(1):18.
APA Ma, Yuehui,Wang, Hongchi,Zhang, Miaomiao,Li, Chong,&Yang, Ji.(2019).A Large-field J=1-0 Survey of CO and Its Isotopologues toward the Cassiopeia A Supernova Remnant.ASTROPHYSICAL JOURNAL,878(1),18.
MLA Ma, Yuehui,et al."A Large-field J=1-0 Survey of CO and Its Isotopologues toward the Cassiopeia A Supernova Remnant".ASTROPHYSICAL JOURNAL 878.1(2019):18.
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