Correlating Infall with Deuterium Fractionation in Dense Cores

Autor:	Schnee, Scott, Brunetti, Nathan, Di Francesco, James, Caselli, Paola, Friesen, Rachel, Johnstone, Doug, Pon, Andy
Rok vydání:	2013
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.1088/0004-637X/777/2/121
Popis:	We present a survey of HCO+ (3-2) observations pointed towards dense cores with previous measurements of N(N2D+)/N(N2H+). Of the 26 cores in this survey, five show the spectroscopic signature of outward motion, nine exhibit neither inward nor outward motion, eleven appear to be infalling, and one is not detected. We compare the degree of deuterium fractionation with infall velocities calculated from the HCO+ spectra and find that those cores with [D]/[H] > 0.1 are more likely to have the signature of inward motions than cores with smaller [D]/[H] ratios. Infall motions are also much more common in cores with masses exceeding their thermal Jeans masses. The fastest infall velocity measured belongs to one of the two protostellar cores in our survey, L1521F, and the observed motions are typically on the order of the sound speed. Comment: Accepted to ApJ
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1309.4103 Zobrazit plný text záznamu View this record from Arxiv