Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The interstellar chemistry of H2C3O isomers   We present the detection of two H2C3O isomers, propynal and cyclopropenone,
toward various starless cores and molecular clouds, together with upper limits
for the third isomer propadienone. We review the processes controlling the
abundances of H2C3O isomers in interstellar media showing that the reactions
involved are gas-phase ones. We show that the abundances of these species are
controlled by kinetic rather than thermodynamic effects.

30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th