Quenching of Star Formation in Molecular Outflow Host NGC 1266
K. Alatalo, K. E. Nyland, G. Graves, S. Deustua, L. M. Young, T. A. Davis, M. Bureau, E. Bayet, L. Blitz, M. Bois, F. Bournaud, M. Cappellari, R. L. Davies, P. … 展开作者
K. Alatalo, K. E. Nyland, G. Graves, S. Deustua, L. M. Young, T. A. Davis, M. Bureau, E. Bayet, L. Blitz, M. Bois, F. Bournaud, M. Cappellari, R. L. Davies, P. T. de Zeeuw, E. Emsellem, S. Khochfar, D. Krajnovic, H. Kuntschner, R. M. McDermid, R. Morganti, T. Naab, T. Oosterloo, M. Sarzi, N. Scott, P. Serra, A. Weijmans
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1 page, Proceedings IAU symposium No. 292: Molecular gas, dust and star formation in galaxies, ed. by Tony Wong and Juergen Ott
我们详细介绍了NGC 1266丰富的分子故事,它在ATLAS 3D调查中的偶然发现(Cappellari et al. 2011),以及它如何成为活动星系核驱动的分子外流的宿主,可能在未来1亿年内淬灭其所有的恒星形成(SF)。虽然主要的合并似乎在煽动其他系统的外流中发挥了作用,但NGC 1266的深度成像以及SAURON的恒星运动学观测未能提供NGC 1266最近参与重大相互作用的证据。分子气体和瞬时SF示踪剂表明,目前恒星形成的地点位于距核200 pc以内的超致密盘中(图1; SF率约为2 Msuns/yr)。另一方面,最近恒星形成的示踪物,如SAURON的Hβ吸收图和恒星星族分析表明,年轻恒星分布在星系中比当前恒星形成更大的区域。随着NGC 1266中心的活动星系核继续将冷气体赶出星系,我们预计恒星形成率会随着恒星形成的最终熄灭而下降。因此,NGC 1266正处于其演化的关键部分,对这个独特星系的持续研究可能有助于提高我们对星系如何从蓝色序列过渡到红色序列的理解(Alatalo et al. 2011)。
英文摘要:
We detail the rich molecular story of NGC 1266, its serendipitous discovery within the ATLAS3D survey (Cappellari et al. 2011) and how it plays host to an AGN-driven molecular outflow, potentially quenching all of its star formation (SF) within the next 100 Myr. While major mergers appear to play a role in instigating outflows in other systems, deep imaging of NGC 1266 as well as stellar kinematic observations from SAURON, have failed to provide evidence that NGC 1266 has recently been involved in a major interaction. The molecular gas and the instantaneous SF tracers indicate that the current sites of star formation are located in a hypercompact disk within 200 pc of the nucleus (Fig. 1; SF rate ~ 2 Msuns/yr). On the other hand, tracers of recent star formation, such as the Hβ absorption map from SAURON and stellar population analysis show that the young stars are distributed throughout a larger area of the galaxy than current star formation. As the AGN at the center of NGC 1266 continues to drive cold gas out of the galaxy, we expect star formation rates to decline as the star formation is ultimately quenched. Thus, NGC 1266 is in the midst of a key portion of its evolution and continued studies of this unique galaxy may help improve our understanding of how galaxies transition from the blue to the red sequence (Alatalo et al. 2011).
A deep, multi-epoch Chandra HETG study of the ionized outflow from NGC 4051
主动吸积的超大质量黑洞显著影响其宿主星系的演化,通过以广角流出排出大部分气体来截断进一步的恒星形成。X射线波段是理解这些黑洞风如何影响其环境的关键,因为流出物具有高温($\sim$ 10 $^{5-8}$ K)。我们已经开发了一个贝叶斯框架,用于表征活动星系核(AGN)的外流,具有更好的探索参数空间和进行鲁棒模型选择的能力。我们将这个框架应用到一个新的700 ks和档案315 ks钱德拉高能透射光栅观测的塞弗特星系NGC 4051。我们已经检测到NGC 4051的六个固有吸收体。这些风分量的速度跨度从400 km s $^{-1}$到30,000 km s $^{-1}$。我们已经确定,统计上最重要的风分量是纯粹的碰撞电离,这是第一次检测到这样的吸收体。这种风具有$T\approx10^7$ K和$v\approx880$ km s $^{-1}$,并且在两个时期之间保持非常稳定。其他慢分量也随时间保持稳定。快速外流成分在2008年至2016年之间改变了它们的性质,这表明要么是物理变化,要么是云在视线范围内移动。对于其中一个快速分量,我们获得了迄今为止最严格的风密度测量值之一,log $n/$ [cm $^{-3}$ ]=13.0 $^{+0.01}_{-0.02}$,并确定它位于$\sim$ 240引力半径处。估计总流出功率超过5%的热光度(尽管有很大的不确定性),使其在星系-黑…
Outflowing shocked gas dominates the NIR H$_2$ emission from the dual AGN NGC6240
Institute of Theoretical Astrophysics, University of Oslo(奥斯陆大学理论天体物理研究所);European Southern Observatory (ESO)(欧洲南方天文台);National and Kapodistrian University of Athens(雅典国立卡波蒂斯坦大学);INAF - Osservatorio Astronomico di Brera(意大利国家天体物理研究所布雷拉天文台);Università degli Studi di Bologna(博洛尼亚大学);INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚空间科学天文台);ASTRON, The Netherlands Institute for Radio Astronomy(荷兰射电天文研究所);Kapteyn Astronomical Institute(卡普坦天文研究所);University of South Carolina(南卡罗来纳大学)