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The Arizona Radio Observatory CO Mapping Survey of Galactic Molecular Clouds. VI. The Cep OB3 Cloud (Cepheus B and C) in CO J=2-1, (CO)-C-13 J=2-1, and CO J=3-2
Bieging, John H.1; Patel, Saahil2; Hofmann, Ryan3; Peters, William L.1; Kainulainen, Jouni4,5; Zhang, Miaomiao5,6,7; Stutz, Amelia M.5,8
2018-10-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN0067-0049
Volume238Issue:2Pages:24
Abstract

We present (1) new fully sampled maps of CO and (CO)-C-13 J = 2-1 emission and CO J = 3-2 emission toward the molecular clouds Cep B and C, associated with the Cep OB3 association; (2) a map of extinction, A(V), derived from IR colors of background stars; and (3) the distribution of young stellar objects (YSOs) over the same field as the molecular maps. An LTE analysis of the CO and (CO)-C-13. maps yields the distribution of molecular column densities and temperatures. Substantial variations are evident across the clouds; smaller subregions show correlations between molecular properties and dust extinction, consistent with a picture of outer photodissociation regions with a layer of CO-dark molecular gas, a CO self-shielded interior, and an inner cold dense region where CO is largely depleted onto grains. Comparing the distribution of YSOs with molecular gas surface density shows a power-law relation very similar in slope to that for the giant molecular cloud associated with the H II region Sh2-235 from a previous paper in this series that employed the same methodology. We note the presence of several compact, isolated CO emission sources in the J = 3-2 maps. The gas temperature and (CO)-C-13. velocity dispersion yield a map of the sonic Mach number, which varies across the cloud but always exceeds unity, confirming the pervasiveness of supersonic turbulence over length scales greater than or similar to 0.1 pc (the map resolution). We also compute a J = 2-1 CO X-factor that varies with position but is, on average, within. 20% of the Galactic average derived from CO J = 1-0 observations.

KeywordISM: clouds ISM: individual objects (Cepheus B and C - Cep OB3-Sh2-155) ISM: kinematics and dynamics ISM: molecules
DOI10.3847/1538-4365/aade01
WOS KeywordNEAR-INFRARED OBSERVATIONS ; INITIAL MASS FUNCTION ; STAR-FORMING REGION ; PROBABILITY-DISTRIBUTION ; DENSITY ; CLUSTERS ; NEBULA ; RATIO ; ASSOCIATION ; EXTRACTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000446816800001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21200
Collection中国科学院紫金山天文台
Corresponding AuthorBieging, John H.
Affiliation1.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
2.Indiana Univ, Dept Astron, Bloomington, IN 47405 USA
3.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA
4.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden
5.Max Planck Inst Astron, Koenigstuhl 17, D-69117 Heidelberg, Germany
6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
7.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
8.Univ Concepcion, Fac Ciencias Fis & Matemat, Dept Astron, Concepcion, Chile
Recommended Citation
GB/T 7714
Bieging, John H.,Patel, Saahil,Hofmann, Ryan,et al. The Arizona Radio Observatory CO Mapping Survey of Galactic Molecular Clouds. VI. The Cep OB3 Cloud (Cepheus B and C) in CO J=2-1, (CO)-C-13 J=2-1, and CO J=3-2[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2018,238(2):24.
APA Bieging, John H..,Patel, Saahil.,Hofmann, Ryan.,Peters, William L..,Kainulainen, Jouni.,...&Stutz, Amelia M..(2018).The Arizona Radio Observatory CO Mapping Survey of Galactic Molecular Clouds. VI. The Cep OB3 Cloud (Cepheus B and C) in CO J=2-1, (CO)-C-13 J=2-1, and CO J=3-2.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,238(2),24.
MLA Bieging, John H.,et al."The Arizona Radio Observatory CO Mapping Survey of Galactic Molecular Clouds. VI. The Cep OB3 Cloud (Cepheus B and C) in CO J=2-1, (CO)-C-13 J=2-1, and CO J=3-2".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 238.2(2018):24.
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