Ammonia clouds in absorption against CAS A

Details Ammonia clouds in absorption against CAS A Ammonia clouds in absorption against CAS A

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..127b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. 127-132.

Astronomy and Astrophysics

Astrophysics

30

Ammonia, Cassiopeia A, Interstellar Matter, Molecular Absorption, Molecular Clouds, Supernova Remnants, Continuous Spectra, Line Spectra, Radio Spectroscopy

Scientific paper

Observations of the (1,1) and (2,2) inversion lines of ammonia in absorption against the supernova remnant Cas A are presented. A line at ≡0 km s-1 is present over the whole area of the continuum source; the features at -40 km s-1 and -47 km s-1 were only found towards the south of the supernova remnant. The rotational temperatures, derived from the relative populations of the (1,1) and (2,2) lines are 18K. This should correspond to a kinetic temperature of 22K. The lines are subthermally excited and H2 densities of 5×103 to 104 cm-3 are consistent with the lines seen in absorption against the continuum source. In one position the authors find that this cloud is clumped and has an extent of 0.12 pc (8arcsec). The relative abundances x(NH3) = (2.9±1.3)×10-9 and x(H2CO) = (2.2±0.3)×10-9 are lower than the values found in dark clouds and globules.

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