4 research outputs found
Digging into the Interior of Hot Cores with ALMA (DIHCA). III: The Chemical Link between NHCHO, HNCO, and HCO
We have analyzed the NHCHO, HNCO, HCO, and CHCN
(CHCN) molecular lines at an angular resolution of
obtained by the Atacama Large Millimeter/submillimeter Array (ALMA) Band 6
toward 30 high-mass star-forming regions. The NHCHO emission has been
detected in 23 regions, while the other species have been detected toward 29
regions. A total of 44 hot molecular cores (HMCs) have been identified using
the moment 0 maps of the CHCN line. The fractional abundances of the four
species have been derived at each HMC. In order to investigate pure chemical
relationships, we have conducted a partial correlation test to exclude the
effect of temperature. Strong positive correlations between NHCHO and
HNCO () and between NHCHO and HCO (0.84) have been
found. These strong correlations indicate their direct chemical links;
dual-cyclic hydrogen addition and abstraction reactions between HNCO and
NHCHO and gas-phase formation of NHCHO from HCO. Chemical
models including these reactions can reproduce the observed abundances in our
target sources.Comment: Accepted for The Astrophysical Journal. 27 pages, 10 tables, and 13
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