AffiliationUniv Arizona, Dept Astron
Univ Arizona, Steward Observ
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PublisherIOP PUBLISHING LTD
CitationHyunju Yoo et al 2018 ApJS 235 31
Rights© 2018. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe performed a molecular line survey of 82 high-mass protostellar objects in a search for inflow signatures associated with high-mass star formation. Using the (HCO+)-C-13 (1-0) line as an optically thin tracer, we detected a statistically significant excess of blue asymmetric line profiles in the HCO+ (1-0) transition, but nonsignificant excesses in the HCO+ (3-2) and H2CO (2(12)-1(11)) transitions. The negative blue excess for the HCN (3-2) transition suggests that the line profiles are affected by dynamics other than inflow motion. The HCO+ (1-0) transition thus seems to be the suitable tracer of inflow motions in high-mass star-forming regions, as previously suggested. We found 27 inflow candidates that have at least 1 blue asymmetric profile and no red asymmetric profile, and derived the inflow velocities to be 0.23-2.00 km s(-1) for 20 of them using a simple two-layer radiative transfer model. Our sample is divided into two groups in different evolutionary stages. The blue excess of the group in relatively earlier evolutionary stages was estimated to be slightly higher than that of the other in the HCO+ (1-0) transition.
VersionFinal published version
SponsorsNational Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1D1A1B02015014]