首页> 外文期刊>The Astrophysical journal >WATER ABUNDANCE AND VELOCITY STRUCTURE IN S140, ρ OPH A, AND B335
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WATER ABUNDANCE AND VELOCITY STRUCTURE IN S140, ρ OPH A, AND B335

机译:S140,ρOPH A和B335中的水丰度和速度结构

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摘要

We present Monte Carlo radiative transfer models for B335, S140, and ρ Ophiuchi A that simulate the emission line arising from the 557 GHz 1_(10)→1_(01) ground-state transition of ortho-H_2~(16)O. These models reproduce the line profiles with a combination of turbulent and macroscopic motions, and are consistent with gravitational infall in ρ Oph A. We cannot, however, discriminate infall from outflow for S140. Our models are consistent with ortho-H_2O abundances relative to H_2 of 2 x 10~(-8) and 4.5 x 10~(-9) in S140 and ρ Oph A, respectively, and an upper limit of 4 x 10~6 (3 σ) in B335, assuming the ratio ortho-H_2/para-H_2 = 0.1. We quantify the impact of dust continuum emission on the derived abundances.
机译:我们提出了B335,S140和ρ蛇夫座A的蒙特卡罗辐射传递模型,它们模拟了由邻邻H_2〜(16)O的557 GHz 1_(10)→1_(01)基态跃迁产生的发射线。这些模型通过湍流运动和宏观运动的组合来再现线轮廓,并且与ρOph A中的重力落入相符。但是,我们无法区分S140的流出落入。我们的模型与S140和ρOph A中相对于H_2的邻位H_2O丰度分别为2 x 10〜(-8)和4.5 x 10〜(-9)一致,上限为4 x 10〜6(假设邻-H_2 /对-H_2之比= 0.1,则B335中的3σ)。我们量化了粉尘连续排放对衍生丰度的影响。

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