SIMBAD references

1995A&A...294..815F - Astronomy and Astrophysics, volume 294, 815-824 (1995/2-3)

Hot shocked ammonia towards Sgr B2.

FLOWER D.R., PINEAU DES FORETS G. and WALMSLEY C.M.

Abstract (from CDS):

Metastable levels of ammonia up to (J,K)=(14,14) have been observed in absorption towards SgrB2, a giant molecular cloud close to the galactic centre. We investigate the physical conditions that can explain these and related observations and conclude that hot (500K) and low density (103cm–3) gas is responsible. We find that C-shock models are able to reproduce these conditions and hence the metastable column densities, providing that the formation of NH3 on grain surfaces and its sputtering by the shock wave are taken into account. The column density of NH2 predicted by the model of the hot ammonia regions is consistent with recent observations of SgrB2-M, but the H2O column density appears to be too high.

Abstract Copyright:

Journal keyword(s): interstellar medium: clouds - interstellar medium: molecules - radio lines: interstellar - interstellar medium: individual: Sgr B2 - ISM: HII regions

Simbad objects: 3

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2020.01.28-23:53:24

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