具有快速喷流驱动外流的射电星系中多相气体的强分子氢发射和运动学
Strong molecular hydrogen emission and kinematics of the multiphase gas in radio galaxies with fast jet-driven outflows
摘要：
射电星系（RGs）中的电离和中性气体外流的观测表明，活动星系核射电喷流反馈对宿主ISM有星系尺度的影响，但目前还不清楚分子气体是如何受到影响的。我们提出了深斯皮策IRS光谱的8个RG，显示快速HI流出。所有这些HI流出RG都具有明亮的H2中红外线，这不能通过UV或X射线加热来解释。这表明，驱动HI外流的射电喷流也是热H2气体激波激发的原因。此外，温暖的H2气体不共享电离/中性气体的运动学。中红外电离气体谱线比H_2谱线宽，60%的H_2谱线被IRS分辨（半高宽可达900 km/s）。在5个源中，NeII线，以及较小程度上的NeIII和NeV线，表现出蓝移的翼（相对于系统速度高达-900 km/s），这与流出的HI或电离气体的运动学相匹配。除了在3个源中的试探性探测外，H2线没有显示出宽翼。这表明，与HI气体相反，H2气体与活动星系核喷流驱动的电离气体外流耦合效率低。虽然喷流动能的一小部分（<10%）的耗散可以解释分子气体的动力学加热，但我们的数据表明，大部分温暖的分子气体并没有从这些星系中排出。
英文摘要：
Observations of ionized and neutral gas outflows in radio-galaxies (RGs) suggest that AGN radio jet feedback has a galaxy-scale impact on the host ISM, but it is still unclear how the molecular gas is affected. We present deep Spitzer IRS spectroscopy of 8 RGs that show fast HI outflows. All of these HI-outflow RGs have bright H2 mid-IR lines that cannot be accounted for by UV or X-ray heating. This suggests that the radio jet, which drives the HI outflow, is also responsible for the shock-excitation of the warm H2 gas. In addition, the warm H2 gas does not share the kinematics of the ionized/neutral gas. The mid-IR ionized gas lines are systematically broader than the H2 lines, which are resolved by the IRS (with FWHM up to 900km/s) in 60% of the detected H2 lines. In 5 sources, the NeII line, and to a lesser extent the NeIII and NeV lines, exhibit blue-shifted wings (up to -900km/s with respect to the systemic velocity) that match the kinematics of the outflowing HI or ionized gas. The H2 lines do not show broad wings, except tentative detections in 3 sources. This shows that, contrary to the HI gas, the H2 gas is inefficiently coupled to the AGN jet-driven outflow of ionized gas. While the dissipation of a small fraction (<10%) of the jet kinetic power can explain the dynamical heating of the molecular gas, our data show that the bulk of the warm molecular gas is not expelled from these galaxies.
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