Infrared Spectroscopy of CO Ro-Vibrational Absorption Lines toward the Obscured AGN IRAS 08572+3915

Infrared Spectroscopy of CO Ro-Vibrational Absorption Lines toward the Obscured AGN IRAS 08572+3915
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朝向被遮挡的 AGN IRAS 的 CO Ro 振动吸收线的红外光谱分析 08572 3915

DOI:
10.1093/pasj/65.1.5
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发表时间:
2012
影响因子:
2.3
通讯作者:
T. Geballe
T. Geballe
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
M. Shirahata;M. Shirahata;T. Nakagawa;T. Usuda;M. Goto;H. Suto;T. Geballe

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我们展示了向被严重遮挡的活动星系核(AGN) IRAS 08572+3915方向的基本反振动带气体CO吸收的高分辨率光谱。我们已经检测到高激发旋转能级的吸收谱线(j517)。速度剖面显示了三个不同的组成部分,其中最强和最宽的部分(Δ v b> 200 km s - 1)是由于温度为270 K的蓝移(160 km s - 1)气体吸收了高达400 km s - 1的速度。除了位于星系系统速度中心的冷成分(20 K)外,还检测到一个更弱但更温暖的成分(700 K),它是高度红移的(+100 km s - 1)。在局部热力学平衡的假设下,270 K组分中CO的柱密度为NCO′4.5′10 18 cm′2,在全分子气体中对应的H2柱密度为NH2′2.5′10 22 cm′2。CO的热激发达到观测到的高旋转水平需要密度大于nc(H2) > 2 × 107 cm × 3,这意味着吸热层的厚度非常小(Δ d< 4 10 × 2 pc),即使它是高度团块的。大柱密度和高径向速度相关联
We present high-resolution spectroscopy of gaseous CO absorption in the fundamental ro-vibrational band toward the heavily obscured active galactic nucleus (AGN) IRAS 08572+3915. We have detected absorption lines up to highly excited rotational levels (J 5 17). The velocity profiles reveal three distinct components, the strongest and broadest (Δ v> 200 km s � 1 ) of which is due to blueshifted (� 160 km s � 1 ) gas at a temperature of� 270 K absorbing at velocities as high as� 400 km s � 1 . A much weaker but even warmer (� 700 K) component, which is highly redshifted (+100 km s � 1 ), is also detected, in addition to a cold (� 20 K) component centered at the systemic velocity of the galaxy. On the assumption of local thermodynamic equilibrium, the column density of CO in the 270 K component is NCO� 4.5� 10 18 cm � 2 , which in fully molecular gas corresponds to an H2 column density of NH2 � 2.5� 10 22 cm � 2 . The thermal excitation of CO up to the observed high rotational levels requires a density greater than nc(H2) > 2� 10 7 cm � 3 , implying that the thickness of the warm absorbing layer is extremely small (Δ d< 4� 10 � 2 pc), even if it is highly clumped. The large column densities and high radial velocities associated
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