Abstract
The molecular cloud around NGC 7358 IRS l has been studied in order to understand the excitation conditions for the unusual H 2 CO masers. Maps in the J=1→0 transition of 13 CO indicate densities with a lower bound of ∼2 × 10 3 cm -3 or more in the cloud around the H II region. The results from the study of various molecular transitions indicate that the conditions required by the Boland & de Jong (1981, A&A, 98) model for the excitation of the H 2 CO maser are not very stringent or unique. The maser can be excited by a compact H II region which is optically thin at millimeter wavelengths
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