A hot ammonia cloud in front of SGR B2 - A possible local outburst?

Details A hot ammonia cloud in front of SGR B2 - A possible local outburst? A hot ammonia cloud in front of SGR B2 - A possible local outburst?

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196..207g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 207-210.

Astronomy and Astrophysics

Astronomy

12

Ammonia, Galactic Nuclei, High Temperature Gases, Molecular Clouds, Radio Sources (Astronomy), H Ii Regions, Line Spectra, Radio Telescopes

Scientific paper

The inversion transitions (1, 1), (2, 2), and (4, 4) of para-NH3 and the (3, 3) and (6, 6) of ortho-NH3 were observed in absorption toward Sgr B2 with an LSR velocity near 0 km/s. The determined optical depths are 1/10 of those for the 63-km/s feature reported previously, and indicate a similarly high rotational temperature, exceeding 100 K. The presence of absorption in all five observed NH3 transitions implies a high excitation of the gas. The high excitation and uniqueness of the line shapes (a sharp cutoff on the low-velocity side and a gradual decline on the high-velocity side) argue for an association with Sgr B2 itself rather than a chance superposition of a foreground clump of gas, in spite of the velocity's being near 0 km/s. The line shapes themselves suggest an expulsion of material which is heated in an accompanying shock front. The angular extent of the hot NH3 cloud is uncertain but might be as small as 1-2 arcmin. Further observations of NH3 and other molecules are required to prove this hypothesis.

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