The Distribution of Ortho–H2D+(11,0–11,1) in L1544: Tracing the Deuteration Factory in Prestellar Cores
Citations Over TimeTop 10% of 2006 papers
Abstract
Prestellar cores are unique laboratories for studying the chemical and physical conditions preceding star formation. We observed the prestellar core L1544 in the fundamental transition of ortho-H_(2)D^(+)(1_(1,0)-1_(1,1)) at different positions over 100" and found a strong correlation between its abundance and the CO depletion factor. We also present a tentative detection of the fundamental transition of para-D_(2)H^+ (1_(1,0)-1_(0,1)) at the dust emission peak. Maps in N_(2)H^+, N_(2)D^+, HCO^+, and DCO^+ are used and interpreted with the aid of a spherically symmetric chemical model that predicts the column densities and abundances of these species as a function of radius. The correlation between the observed deuterium fractionation of H^(+)_3, N_(2)H^+, and HCO^+ and the observed integrated CO depletion factor across the core can be reproduced by this chemical model. In addition, a simpler model is used to study the H_(2)D^+ ortho-to-para ratio. We conclude that, in order to reproduce the observed ortho-H_(2)D^+ observations, the grain radius should be larger than 0.3 μm. \n
Related Papers
- → Mid-infrared vibrational study of deuterium-containing PAH variants(2016)16 cited
- → On the behavior of deuterium in ultrathin SiO2 films upon thermal annealing(1998)34 cited
- → Isotopic effects of low concentration of deuterium in water on biological systems(2014)12 cited
- The Isotopic Effects of Deuterium on Biological Objects(2015)
- Experimental study on enrichment of deuterium by self-displacement gas chromatography using two columns packed with Pd(2008)