LWS observations of Sgr B2: NH3 lines

Details LWS observations of Sgr B2: NH3 lines LWS observations of Sgr B2: NH3 lines

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..639b&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 639

Physics

Sgrb2, Molecular Lines

Scientific paper

We report the observations of the pure rotational lines of NH3 towards SgrB2(M). All lines are in absorption, the non-metastable lines being about a factor ten lower than the metastable lines. We discuss two possibilities: a) the non-metastable lines are radiatively pumped by the FIR source at 1 pc which illuminates a tenuous ( 1000 cm-3) and hot ( 400 K) gas or b) the non-metastable lines are collisionally pumped and originate in dense ( 105 cm-3) and warm ( 150 K) gas, whose column density is 6 ṡ 1015 cm-2.

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