HCl Absorption toward Sagittarius B2
HCl Absorption toward Sagittarius B2
复制标题
HCl 向人马座 B2 的吸收
DOI：
10.1086/309570
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
David P. Miller
中科院分区：
文献类型：
--
作者：
J. Zmuidzinas;G. Blake;J. Carlstrom;J. Keene;David P. Miller
我们探测到了626 GHz的氯化氢（H35 Cl）的J = 1 → 0跃迁的吸收对尘埃的连续发射的分子云人马座B2。所观察到的线的形状是一致的混合的三个超精细组件的这种过渡的速度分布在其他物种中观察到的Sgr B2。谱线的表观光学深度为τ π 1，最小HCl柱密度为1.6 × 1014 cm-2。建立了详细的辐射传输模型，包括碰撞和辐射激发、尘埃的吸收和发射以及温度和密度的径向变化。在HCl/H_2 ~ 1.1 × 10 ~（-9）范围内，模型与实验数据吻合较好。将这一结果与化学模型进行比较表明，在围绕SgrB 2（N）和（M）尘芯的分子包层中，气相氯的消耗因子在50-180之间。
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 τ ≈ 1, and the minimum HCl column density is 1.6 × 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 × 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.