HCl Absorption Toward Sagittarius B2

Details HCl Absorption Toward Sagittarius B2 HCl Absorption Toward Sagittarius B2

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l.125z&link_type=abstract

Astrophysical Journal Letters v.447, p.L125

Astronomy and Astrophysics

Astronomy

26

Ism: Molecules, Ism: Abundances, Ism: Individual Name: Sagittarius B2

Scientific paper

We have detected the 626 GHz J = 1 --> 0 transition of hydrogen chloride (H35Cl) in absorption against the dust continuum emission of the molecular cloud Sagittarius B2. The observed line shape is consistent with the blending of the three hyperfine components of this transition by the velocity profile of Sgr B2 observed in other species. The apparent optical depth of the line is tau ~ 1, and the minimum HCl column density is 1.6 x 1014 cm-2. A detailed radiative transfer model was constructed which includes collisional and radiative excitation, absorption and emission by dust, and the radial variation of temperature and density. Good agreement between the model and the data is obtained for HCl/H2 ~ 1.1 x 10-9. Comparison of this result to chemical models indicates that the depletion factor of gas-phase chlorine is between 50--180 in the molecular envelope surrounding the SgrB2(N) and (M) dust cores.

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