Document Detail

H2, H3+ and the age of molecular clouds and prestellar cores.
MedLine Citation:
PMID:  23028166     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Measuring the age of molecular clouds and prestellar cores is a difficult task that has not yet been successfully accomplished although the information is of paramount importance to help in understanding and discriminating between different formation scenarios. Most chemical clocks suffer from unknown initial conditions and are therefore difficult to use. We propose a new approach based on a subset of deuterium chemistry that takes place in the gas phase and for which initial conditions are relatively well known. It relies primarily on the conversion of H(3)(+) into H(2)D(+) to initiate deuterium enrichment of the molecular gas. This conversion is controlled by the ortho/para ratio of H(2) that is thought to be produced with the statistical ratio of 3 and subsequently slowly decays to an almost pure para-H(2) phase. This slow decay takes approximately 1 Myr and allows us to set an upper limit on the age of molecular clouds. The deuterium enrichment of the core takes longer to reach equilibrium and allows us to estimate the time necessary to form a dense prestellar core, i.e. the last step before the collapse of the core into a protostar. We find that the observed abundance and distribution of DCO(+) and N(2)D(+) argue against quasi-static core formation and favour dynamical formation on time scales of less than 1 Myr. Another consequence is that ortho-H(2) remains comparable to para-H(2) in abundance outside the dense cores.
L Pagani; P Lesaffre; E Roueff; M Jorfi; P Honvault; T González-Lezana; A Faure
Related Documents :
23978286 - Periodic arrays of metal nanorings and nanocrescents fabricated by a scalable colloidal...
24632156 - Nanostructures formed by cyclodextrin covered aminobenzophenones through supramolecular...
5102556 - Intramitochondrial yolk-crystals of frog oocytes. i. formation of yolk-crystal inclusio...
23149106 - Eu(iii) uptake on rectorite in the presence of humic acid: a macroscopic and spectrosco...
16896446 - The hydration of the scandium(iii) ion in aqueous solution and crystalline hydrates stu...
23406166 - A new o-prenylated flavonol from the roots of sophora interrupta.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Philosophical transactions. Series A, Mathematical, physical, and engineering sciences     Volume:  370     ISSN:  1364-503X     ISO Abbreviation:  Philos Trans A Math Phys Eng Sci     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-10-02     Completed Date:  2012-11-13     Revised Date:  2013-04-24    
Medline Journal Info:
Nlm Unique ID:  101133385     Medline TA:  Philos Trans A Math Phys Eng Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  5200-12     Citation Subset:  -    
LERMA, UMR8112 du CNRS, Observatoire de Paris, 61, Av. de l'Observatoire, 75014 Paris, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Using deuterated H3+ and other molecular species to understand the formation of stars and planets.
Next Document:  Temperature changes and energy inputs in giant planet atmospheres: what we are learning from H3+.