DISCOVERY OF AN ACTIVE GALACTIC NUCLEUS DRIVEN MOLECULAR OUTFLOW IN THE LOCAL EARLY-TYPE GALAXY NGC 1266-猫眼课题宝

DOI：

10.1088/0004-637x/735/2/88

发表时间：

2011-04

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

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作者：

K. Alatalo;L. Blitz;L. Young;T. Davis;M. Bureau;Laura A. Lopez;M. Cappellari;N. Scott;K. Shapiro;A. Crocker;Sergio Martín;M. Bois;F. Bournaud;R. Davies;P. Zeeuw;P. Duc;E. Emsellem;Jesus Falcon-Barosso;S. Khochfar;D. Krajnović;H. Kuntschner;P. Lablanche;R. McDermid;R. Morganti;T. Naab;T. Oosterloo;M. Sarzi;P. Serra;A. Weijmans

我们发现了来自附近无相互作用的S0场星系NGC1266核心的强大分子风。单盘CO廓线的排放量为±400kM S−1，需要嵌套的高斯拟合才能得到适当的描述。干涉观测显示了一个质量为1.1×109M☉的中心集中的大分子组分和一个分子外流，其分子质量为≈2.4×107M☉。接近系统速度的分子气体由一个旋转的致密核组成，质量约为4.1×108M☉，半径为≈60 pC。这个致密的分子核的表面密度为≈2.7×104M☉PC−2，比银河系盘中巨型分子云的表面密度大两个数量级以上，尽管它具有极端的运动学和能量活动，但它似乎处于肯尼库特-施密特关系中。我们把这个原子核解释为一个限制外流风的圆盘。≈13M☉yr−1的质量流出速率导致≲85 Myr的耗尽时间刻度。NGC1266中的恒星形成不足以驱动外流，因此很可能是由活动星系核驱动的。中心100pc的大多数分子气体的集中需要非常大的角动量损失，但没有明显的伴星或相互作用的星系存在，使这种转移成为可能。NGC 1266是第一个已知的流出的分子系统，没有显示出任何最近相互作用的证据。

We report the discovery of a powerful molecular wind from the nucleus of the non-interacting nearby S0 field galaxy NGC 1266. The single-dish CO profile exhibits emission to ±400 km s−1 and requires a nested Gaussian fit to be properly described. Interferometric observations reveal a massive, centrally concentrated molecular component with a mass of 1.1 × 109 M☉ and a molecular outflow with a molecular mass of ≈2.4 × 107 M☉. The molecular gas close to the systemic velocity consists of a rotating, compact nucleus with a mass of about 4.1 × 108 M☉ within a radius of ≈60 pc. This compact molecular nucleus has a surface density of ≈2.7 × 104 M☉ pc−2, more than two orders of magnitude larger than that of giant molecular clouds in the disk of the Milky Way, and it appears to sit on the Kennicutt–Schmidt relation despite its extreme kinematics and energetic activity. We interpret this nucleus as a disk that confines the outflowing wind. A mass outflow rate of ≈13 M☉ yr−1 leads to a depletion timescale of ≲85 Myr. The star formation in NGC 1266 is insufficient to drive the outflow, and thus it is likely driven by the active galactic nucleus. The concentration of the majority of the molecular gas in the central 100 pc requires an extraordinary loss of angular momentum, but no obvious companion or interacting galaxy is present to enable the transfer. NGC 1266 is the first known outflowing molecular system that does not show any evidence of a recent interaction.

DISCOVERY OF AN ACTIVE GALACTIC NUCLEUS DRIVEN MOLECULAR OUTFLOW IN THE LOCAL EARLY-TYPE GALAXY NGC 1266

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