Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Molecular Condensations Ahead of Herbig-Haro Objects. I.
  Multi-transition Observations of HH 2   We present a CSO and BIMA molecular line survey of the dense, quiescent
molecular environment ahead of HH2. The molecular gas is cold, 13 K, and
moderately dense, 3x10^5 cm^-3. A total of 14 species has been detected
(including different isotopes and deuterated species). The relative abundances
of the clump are compared with other dense molecular environments, including
quiescent dark clouds, and active low and high mass star forming regions. This
comparison confirms the peculiar chemical composition of the quiescent gas
irradiated by the HH objects. Thus, from this comparison, we found that the
HCO+, CH3OH and H2CO are strongly enhanced. SO and SO2 are weakly enhanced,
whereas HCN and CS are underabundant. The CN abundance is within the range of
value found in starless dark clouds, but it is low with respect to high mass
star forming regions. Finally, the chemical composition of HH2 confirms the
qualitative results of the Viti & Williams (1999) complex chemical model that
follows the chemical behavior of a molecular clump irradiated by a HH object.

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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat