首页> 外文期刊>The Astrophysical journal >SUBMILLIMETER WAVE ASTRONOMY SATELLITE OBSERVATIONS OF EXTENDED WATER EMISSION IN ORION
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SUBMILLIMETER WAVE ASTRONOMY SATELLITE OBSERVATIONS OF EXTENDED WATER EMISSION IN ORION

机译:猎户座中水扩散的次卫星波天文卫星观测

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We have used the Submillimeter Wave Astronomy Satellite to map the ground-state 1_(10) → 1_(01) transition of ortho-H_2O at 557 GHz in the Orion molecular cloud. H_2O emission was detected in Orion over an angular extent of about 20′, or nearly 3 pc. The water emission is relatively weak, with line widths (3-6 km s~(-1)) and V_(LSR) velocities (9-11 km s~(-1)) consistent with an origin in the cold gas of the molecular ridge. We find that the ortho-H_2O abundance relative to H_2 in the extended gas in Orion varies between 1 and 8 x 10~(-8), with an average of 3 x 10~(-8). The absence of detectable narrow-line ortho-H_2~(18)O emission is used to set a 3 σ upper limit on the relative ortho-H_2O abundance of 7 x 10~(-8).
机译:我们已使用亚毫米波天文学卫星在Orion分子云中绘制了557 GHz时邻H_2O的基态1_(10)→1_(01)跃迁。在Orion中检测到H_2O排放的角度范围约为20',或接近3 pc。出水相对较弱,线宽(3-6 km s〜(-1))和V_(LSR)速度(9-11 km s〜(-1))与冰冷气的起源一致。分子脊。我们发现,在猎户座扩展气体中,相对于H_2的邻H_2O丰度在1至8 x 10〜(-8)之间变化,平均为3 x 10〜(-8)。缺乏可检测到的窄线邻位H_2〜(18)O发射用于将相对邻位H_2O丰度7 x 10〜(-8)设置为3σ上限。

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