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dc.contributor.authorKim, Gwanjeong
dc.contributor.authorTatematsu, Kenichi
dc.contributor.authorLiu, Tie
dc.contributor.authorYi, Miss Hee-Weon
dc.contributor.authorHe, Jinhua
dc.contributor.authorHirano, Naomi
dc.contributor.authorLiu, Sheng-Yuan
dc.contributor.authorChoi, Minho
dc.contributor.authorSanhueza, Patricio
dc.contributor.authorToth, L. Viktor
dc.contributor.authorEvans, Neal J.
dc.contributor.authorFeng, Siyi
dc.contributor.authorJuvela, Mika
dc.contributor.authorKim, Kee-Tae
dc.contributor.authorVastel, Charlotte
dc.contributor.authorLee, Jeong-Eun
dc.contributor.authorNguyn-Lu'o'ng, Quang
dc.contributor.authorKang, Miju
dc.contributor.authorRistorcelli, Isabelle
dc.contributor.authorFehér, O.
dc.contributor.authorWu, Yuefang
dc.contributor.authorOhashi, Satoshi
dc.contributor.authorWang, Ke
dc.contributor.authorKandori, Ryo
dc.contributor.authorHirota, Tomoya
dc.contributor.authorSakai, Takeshi
dc.contributor.authorLu, Xing
dc.contributor.authorThompson, Mark A.
dc.contributor.authorFuller, Gary A.
dc.contributor.authorLi, Di
dc.contributor.authorShinnaga, Hiroko
dc.contributor.authorKim, Jungha
dc.date.accessioned2020-09-17T00:07:25Z
dc.date.available2020-09-17T00:07:25Z
dc.date.issued2020-08-12
dc.identifier.citationKim , G , Tatematsu , K , Liu , T , Yi , M H-W , He , J , Hirano , N , Liu , S-Y , Choi , M , Sanhueza , P , Toth , L V , Evans , N J , Feng , S , Juvela , M , Kim , K-T , Vastel , C , Lee , J-E , Nguyn-Lu'o'ng , Q , Kang , M , Ristorcelli , I , Fehér , O , Wu , Y , Ohashi , S , Wang , K , Kandori , R , Hirota , T , Sakai , T , Lu , X , Thompson , M A , Fuller , G A , Li , D , Shinnaga , H & Kim , J 2020 , ' Molecular Cloud Cores with High Deuterium Fraction : Nobeyama Single-Pointing Survey ' , Astrophysical Journal, Supplement Series , vol. 249 . https://doi.org/10.3847/1538-4365/aba746
dc.identifier.issn0067-0049
dc.identifier.otherPURE: 22620636
dc.identifier.otherPURE UUID: 08a2484b-06cc-45ff-89b5-464818774211
dc.identifier.otherArXiv: http://arxiv.org/abs/2007.12319v1
dc.identifier.otherORCID: /0000-0001-5392-909X/work/80580292
dc.identifier.otherScopus: 85091086186
dc.identifier.urihttp://hdl.handle.net/2299/23130
dc.description© 2020 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.3847/1538-4365/aba746
dc.description.abstractWe present the results of a single-pointing survey of 207 dense cores embedded in Planck Galactic Cold Clumps distributed in five different environments ($\lambda$ Orionis, Orion A, B, Galactic plane, and high latitudes) to identify dense cores on the verge of star formation for the study of the initial conditions of star formation. We observed these cores in eight molecular lines at 76-94 GHz using the Nobeyama 45-m telescope. We find that early-type molecules (e.g., CCS) have low detection rates and that late-type molecules (e.g., N$_2$H$^+$, c-C$_3$H$_2$) and deuterated molecules (e.g., N$_2$D$^+$, DNC) have high detection rates, suggesting that most of the cores are chemically evolved. The deuterium fraction (D/H) is found to decrease with increasing distance, indicating that it suffers from differential beam dilution between the D/H pair of lines for distant cores ($>$1 kpc). For $\lambda$ Orionis, Orion A, and B located at similar distances, D/H is not significantly different, suggesting that there is no systematic difference in the observed chemical properties among these three regions. We identify at least eight high D/H cores in the Orion region and two at high latitudes, which are most likely to be close to the onset of star formation. There is no clear evidence of the evolutionary change in turbulence during the starless phase, suggesting that the dissipation of turbulence is not a major mechanism for the beginning of star formation as judged from observations with a beam size of 0.04 pc.en
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal, Supplement Series
dc.subjectastro-ph.GA
dc.subjectastro-ph.SR
dc.titleMolecular Cloud Cores with High Deuterium Fraction : Nobeyama Single-Pointing Surveyen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3847/1538-4365/aba746
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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