Is there any linkage between interstellar aldehyde and alcohol?
  It is speculated that there might be some linkage between interstellar
aldehydes and their corresponding alcohols. Here, an observational study and
astrochemical modeling are coupled together to illustrate the connection
between them. The ALMA Cycle 4 data of a hot molecular core, G10.47+0.03 is
utilized for this study. Various aldehydes (acetaldehyde, propanal, and
glycolaldehyde), alcohols (methanol and ethylene glycol), and a ketone
(acetone) are identified in this source. The excitation temperatures and the
column densities of these species were derived via the rotation diagram method
assuming LTE conditions. An extensive investigation is carried out to
understand the formation of these species. Six pairs of aldehyde-alcohol: i)
methanal and methanol; ii) ethanal and ethanol; iii) propanal and 1-propanol;
iv) propenal and allyl alcohol; v) propynal and propargyl alcohol; vi)
glycolaldehyde and ethylene glycol; vii) along with one pair of ketone-alcohol
(acetone and isopropanol) and viii) ketene-alcohol (ethenone and vinyl alcohol)
are considered for this study. Two successive hydrogenation reactions in the
ice phase are examined to form these alcohols from aldehydes, ketone, and
ketene, respectively. Quantum chemical methods are extensively executed to
review the ice phase formation route and the kinetics of these species. Based
on the obtained kinetic data, astrochemical modeling is employed to derive the
abundances of these aldehydes, alcohols, ketone, and ketene in this source. It
is seen that our model could successfully explain the observed abundances of
various species in this hot molecular core.
