Digging into the Interior of Hot Cores with the ALMA (DIHCA). III. The Chemical Link between NH2 CHO, HNCO, and H2 CO
Journal article, 2023
We have analyzed the NH2CHO, HNCO, H2CO, and CH3CN (13CH3CN) molecular lines at an angular resolution of ∼0.″3 obtained by the Atacama Large Millimeter/submillimeter Array Band 6 toward 30 high-mass star-forming regions. The NH2CHO 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 CH3CN 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 NH2CHO and HNCO (ρ = 0.89) and between NH2CHO and H2CO (0.84) have been found. These strong correlations indicate their direct chemical links; dual-cyclic hydrogen addition and abstraction reactions between HNCO and NH2CHO and gas-phase formation of NH2CHO from H2CO. Chemical models including these reactions can reproduce the observed abundances in our target sources.
Author
Kotomi Taniguchi
National Astronomical Observatory of Japan
Patricio Sanhueza
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Fernando A. Olguin
National Tsing Hua University
Prasanta Gorai
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Ankan Das
Institute of Astronomy Space and Earth Science
Fumitaka Nakamura
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Masao Saito
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Qizhou Zhang
Harvard-Smithsonian Center for Astrophysics
X. Lu
Shanghai Astronomical Observatory
Shanghuo Li
Max Planck Society
Huei-Ru Vivien Chen
National Tsing Hua University
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 950 1 57Subject Categories
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Infrastructure
Onsala Space Observatory
DOI
10.3847/1538-4357/acca1d