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arXiv 2203.07484astro-ph.GA
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双子座NIFS对附近活跃星系的摄食和反馈过程的调查:VI -恒星星族

Gemini NIFS survey of feeding and feedback processes in nearby Active Galaxies: VI -- Stellar Populations

Rogério Riffel, Luis G. Dahmer-Hahn, Rogemar A. Riffel, Thaisa Storchi-Bergmann, Natacha Z. Dametto, Richard Davies, Leonard Burtscher, Marina Bianchin, Daniel … 展开作者

Rogério Riffel, Luis G. Dahmer-Hahn, Rogemar A. Riffel, Thaisa Storchi-Bergmann, Natacha Z. Dametto, Richard Davies, Leonard Burtscher, Marina Bianchin, Daniel Ruschel-Dutra, Claudio Ricci, David J. Rosario

摘要:

我们使用双子座近红外积分场摄谱仪(NIFS)的自适应光学辅助数据立方体映射的恒星人口的内部几百秒差距的18个附近的塞弗特星系的样本。近红外光主要由年轻到中老恒星星族的贡献,轻加权平均年龄为$<t>_L\ \lesssim $ 1.5“,Gyr.热尘埃($HD$)的发射是中央峰值(在未解决的核心),但它也需要复制连续超过近一半的样品的核心。分析了星系核区的恒星布居特性及其与星系整体性质的关系。我们发现X射线光度和$HD$,无特征连续$FC$和红化$A_V$的贡献之间的相关性。我们将这些相关性归因于所有这些性质都与活动星系核(AGN)的质量吸积速率有关。我们还发现的热光度$log(LBol_{obs})$与质量加权平均年龄的恒星人口的相关性,解释为由于新恒星的形成和触发/喂养的活动星系核之间的延迟。到达超大质量黑洞的气体可能来自已经有些进化的中间年龄恒星群($<t>_L \lesssim $ 1.5\,Gyr)的质量损失。总之,我们的研究结果表明,有一个显着比例的年轻到中等年龄的恒星星族在内部的几个100\,pc的活动星系,这表明该地区正面临着一个复兴的过程中,活动星系核,一旦触发,排除进一步的恒星形成,在这个意义上说,它可以与缺乏新的恒星形成的核区域。

英文摘要:

We use Gemini Near-Infrared Integral Field Spectrograph (NIFS) adaptive optics assisted data-cubes to map the stellar population of the inner few hundred parsecs of a sample of 18 nearby Seyfert galaxies. The near-infrared light is dominated by the contribution of young to intermediate old stellar populations, with light-weighted mean ages $<t>_L\ \lesssim $ 1.5\,Gyr. Hot dust ($HD$) emission is centrally peaked (in the unresolved nucleus), but it is also needed to reproduce the continuum beyond the nucleus in nearly half of the sample. We have analysed the stellar population properties of the nuclear region and their relation with more global properties of the galaxies. We find a correlation between the X-ray luminosity and the contributions from the $HD$, featureless continuum $FC$ and reddening $A_V$. We attribute these correlations to the fact that all these properties are linked to the mass accretion rate to the active galactic nuclei (AGN). We also find a correlation of the bolometric luminosity $log(LBol_{obs})$ with the mass-weighted mean age of the stellar population, interpreted as due a delay between the formation of new stars and the triggering/feeding of the AGN. The gas reaching the supermassive black hole is probably originated from mass loss from the already somewhat evolved intermediate-age stellar population ($<t>_L \lesssim $ 1.5\,Gyr). In summary, our results show that there is a significant fraction of young to intermediate age stellar populations in the inner few 100\,pc of active galaxies, suggesting that this region is facing a rejuvenation process in which the AGN, once triggered, precludes further star formation, in the sense that it can be associated with the lack of new star formation in the nuclear region.

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