Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/25125
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Kong, Shuo | en_US |
dc.contributor.author | Tan, Jonathan C. | en_US |
dc.contributor.author | Caselli, Paola | en_US |
dc.contributor.author | FONTANI, FRANCESCO | en_US |
dc.contributor.author | Pillai, Thushara | en_US |
dc.contributor.author | Butler, Michael J. | en_US |
dc.contributor.author | Shimajiri, Yoshito | en_US |
dc.contributor.author | Nakamura, Fumitaka | en_US |
dc.contributor.author | Sakai, Takeshi | en_US |
dc.date.accessioned | 2020-05-25T12:08:53Z | - |
dc.date.available | 2020-05-25T12:08:53Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/25125 | - |
dc.description.abstract | We study deuterium fractionation in two massive starless/early-stage cores, C1-N and C1-S, in Infrared Dark Cloud G028.37+00.07, which was first identified by Tan et al. with ALMA. Line emission from multiple transitions of N<SUB>2</SUB>H<SUP>+</SUP> and N<SUB>2</SUB>D<SUP>+</SUP> were observed with the ALMA, CARMA, SMA, JCMT, NRO 45 m, and IRAM 30 m telescopes. By simultaneously fitting the spectra, we estimate the excitation conditions and deuterium fraction, {D}<SUB>{frac</SUB>}<SUP>{{{N</SUP>}}<SUB>2</SUB>{{{H}}}<SUP>+</SUP>} \equiv \quad [{{{N}}}<SUB>2</SUB>{{{D}}}<SUP>+</SUP>]/[{{{N}}}<SUB>2</SUB>{{{H}}}<SUP>+</SUP>], with values of {D}<SUB>{frac</SUB>}<SUP>{{{N</SUP>}}<SUB>2</SUB>{{{H}}}<SUP>+</SUP>} ≃ 0.2-0.7, several orders of magnitude above the cosmic [D]/[H] ratio. Additional observations of o-H<SUB>2</SUB>D<SUP>+</SUP> are also presented that help constrain the ortho-to-para ratio of H<SUB>2</SUB>, which is a key quantity affecting the degree of deuteration. We then present chemodynamical modeling of the two cores, especially exploring the implications for the collapse rate relative to free-fall, α<SUB>ff</SUB>. In order to reach the high level of observed deuteration of {{{N}}}<SUB>2</SUB>{{{H}}}<SUP>+</SUP>, we find that the most likely evolutionary history of the cores involves collapse at a relatively slow rate, ≲ one-tenth of free-fall. | en_US |
dc.language.iso | eng | en_US |
dc.title | The Deuterium Fraction in Massive Starless Cores and Dynamical Implications | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/821/2/94 | en_US |
dc.identifier.scopus | 2-s2.0-84969716695 | en_US |
dc.identifier.isi | 000377102700023 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/821/2/94 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 821 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 94 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...821...94K | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0003-0348-3418 | - |
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