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arXiv 2203.01355astro-ph.GA
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附近2型塞弗特星系NGC 1068中千秒尺度的中性碳流出:负反馈AGN的证据

The Kiloparsec-scale Neutral Atomic Carbon Outflow in the Nearby Type-2 Seyfert Galaxy NGC 1068: Evidence for Negative AGN Feedback

Toshiki Saito, Shuro Takano, Nanase Harada, Taku Nakajima, Eva Schinnerer, Daizhong Liu, Akio Taniguchi, Takuma Izumi, Yumi Watanabe, Kazuharu Bamba, Eric Herbs… 展开作者

Toshiki Saito, Shuro Takano, Nanase Harada, Taku Nakajima, Eva Schinnerer, Daizhong Liu, Akio Taniguchi, Takuma Izumi, Yumi Watanabe, Kazuharu Bamba, Eric Herbst, Kotaro Kohno, Yuri Nishimura, Sophia Stuber, Yoichi Tamura, Tomoka Tosaki

摘要:

活动星系核(AGN)反馈被认为是调节星系内恒星形成的关键机制。因此,研究活动星系核流出气体的物理性质对于理解星系和超大质量黑洞的共同演化至关重要。本文报道了用55 pc分辨率的ALMA中性碳[CI] $^3P_1\text{-}^3P_0$对附近2型塞弗特星系NGC 1068中心1 kpc的观测,并辅以55 pc分辨率的CO($J=1\text{-}0$)观测。我们发现,[CI]发射的中央kpc的强烈增强的$>$ 5的一个因素相比,典型的[CI]/CO的强度比$\sim$ 0.2附近的星爆星系(单位的亮度温度)。最[CI]增强的气体(比率$>$ 1)表现出kpc尺度的拉长结构,中心在活动星系核,匹配已知的双锥电离气体流出夹带分子气体的磁盘。一个截断的,减速的双锥模型很好地解释了细长结构的运动学,表明[CI]增强主要是由盘中的ISM和高度倾斜的电离气体流出(可能是由射电喷流驱动)之间的相互作用驱动的。我们的研究结果强烈支持“CO解离的情况下”,而不是“原位C形成”的一个更喜欢一个完美的双锥几何形状。我们认为,NGC 1068中的高[CI]/CO强度比气体直接跟踪盘中的ISM,该盘目前被射流和流出物解离和夹带,即,活动星系核反馈的“负”效应。

英文摘要:

Active galactic nucleus (AGN) feedback is postulated as a key mechanism for regulating star formation within galaxies. Studying the physical properties of the outflowing gas from AGN is thus crucial for understanding the co-evolution of galaxies and supermassive black holes. Here we report 55 pc resolution ALMA neutral atomic carbon [CI] $^3P_1\text{-}^3P_0$ observations toward the central 1 kpc of the nearby type-2 Seyfert galaxy NGC 1068, supplemented by 55 pc resolution CO($J=1\text{-}0$) observations. We find that [CI] emission within the central kpc is strongly enhanced by a factor of $>$5 compared to the typical [CI]/CO intensity ratio of $\sim$0.2 for nearby starburst galaxies (in units of brightness temperature). The most [CI]-enhanced gas (ratio $>$ 1) exhibits a kpc-scale elongated structure centered at the AGN that matches the known biconical ionized gas outflow entraining molecular gas in the disk. A truncated, decelerating bicone model explains well the kinematics of the elongated structure, indicating that the [CI] enhancement is predominantly driven by the interaction between the ISM in the disk and the highly inclined ionized gas outflow (which is likely driven by the radio jet). Our results strongly favor the "CO dissociation scenario" rather than the "in-situ C formation" one which prefers a perfect bicone geometry. We suggest that the high [CI]/CO intensity ratio gas in NGC 1068 directly traces ISM in the disk that is currently dissociated and entrained by the jet and the outflow, i.e., the "negative" effect of the AGN feedback.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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