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DISCOVERY OF SUPERTHERMAL HYDROXYL (OH) IN THE HH 211 OUTFLOW

机译:在HH 211流出物中发现超热羟基(OH)

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摘要

We present a 5-37 μm infrared spectrum obtained with the Spitzer Space Telescope toward the southeastern lobe of the young protostellar outflow HH 211. The spectrum shows an extraordinary sequence of OH emission lines arising in highly excited rotational levels up to an energy E/k ≈ 28,200 K above the ground level. This is, to our knowledge, by far the highest rotational excitation of OH observed in the interstellar medium. The spectrum also contains several pure rotational transitions of H_2O (v = 0), H_2 (v = 0) S(0)-S(7), HD (v = 0) R(3)-R(6), and atomic fine-structure lines of [Fe II], [Si II], [Ne II], [S I], and [Cl I]. The origin of the highly excited OH emission is most likely the photodissociation of H_2O by the UV radiation generated in the terminal outflow shock of HH 211.
机译:我们展示了用Spitzer空间望远镜获得的,朝向年轻的原恒星流出HH 211的东南波瓣的5-37μm红外光谱。该光谱显示了由高激发旋转能级(最高能量E / k)产生的OH发射谱线的非凡序列。 ≈高于地面28,200K。据我们所知,这是星际介质中观察到的最高的OH旋转激发。光谱还包含H_2O(v = 0),H_2(v = 0)S(0)-S(7),HD(v = 0)R(3)-R(6)和原子的几个纯旋转跃迁[Fe II],[Si II],[Ne II],[SI]和[Cl I]的精细结构线。高激发的OH发射的起因很可能是HH 211的最终流出激波中产生的UV辐射引起的H_2O的光解离。

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