HCL ABSORPTION TOWARD SAGITTARIUS B2

被引：52

作者：

ZMUIDZINAS, J ^{[1
]}

BLAKE, GA ^{[1
]}

CARLSTROM, J ^{[1
]}

KEENE, J ^{[1
]}

MILLER, D ^{[1
]}

机构：

[1] CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125

来源：

ASTROPHYSICAL JOURNAL | 1995年 / 447卷 / 02期

关键词：

ISM; ABUNDANCES; INDIVIDUAL (SAGITTARIUS B2); MOLECULES;

D O I：

10.1086/309570

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have detected the 626 GHz J = 1 --> 0 transition of hydrogen chloride ((HCl)-Cl-35) 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 approximate to 1, and the minimum HCl column density is 1.6 x 10(14) 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/H-2 similar to 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.

引用

页码：L125 / L128

页数：4

共 31 条

[11] THE ABUNDANCE OF INTERSTELLAR CHLORINE IN THE GALAXY [J].