Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity

Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity
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II 型类星体中的年轻恒星群:恒星形成和核活动开始的时间

DOI:
10.1093/mnras/stw3175
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发表时间:
2017
影响因子:
4.8
通讯作者:
Bessiere P
Bessiere P
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bessiere P

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尽管新兴的形态学证据表明,发光类星体的活动星系核(AGN)的触发星系合并,触发合并的性质和事件的顺序在触发序列仍然不确定。在这项工作中,我们提出了一个详细的研究21个II型类星体的宿主星系的恒星种群,目的是了解合并的发病之间的事件的顺序,触发相关的星暴和类星体活动的启动。为此,我们模型的高品质,宽光谱覆盖范围,中等分辨率的光学光谱的II型类星体。我们发现,在21个对象中,高阶巴耳末吸收线,年轻的恒星种群(YSP)的特征,直接检测到的样本的百分之六十二。我们还适合这些光谱使用一些组合的恒星和/或幂律成分,代表可行的形成历史,以及包括散射活动星系核光的可能性。我们发现,90%的II型类星体宿主星系需要包含一个YSP来充分模拟它们的光谱,而71%的样本需要包含一个年龄<1亿年的YSP。由于大多数II型类星体宿主星系中的YSP年龄与AGN活动的预期寿命相当,这些结果提供了强有力的证据,表明类星体是在接近合并引起的星暴峰值时被触发的。
Despite the emerging morphological evidence that luminous quasar-like active galactic nuclei (AGN) are triggered in galaxy mergers, the natures of the triggering mergers and the order of events in the triggering sequence remain uncertain. In this work, we present a detailed study of the stellar populations of the host galaxies of 21 type II quasars, with the aim of understanding the sequence of events between the onset of the merger, the triggering of the associated starburst and the initiation of the quasar activity. To this end, we model high-quality, wide spectral coverage, intermediate-resolution optical spectra of the type II quasars. We find that of the 21 objects, the higher order Balmer absorption lines, characteristic of young stellar populations (YSPs), are directly detected in ∼62 per cent of the sample. We also fit these spectra using a number of combinations of stellar and/or power-law components, representative of viable formation histories, as well as including the possibility of scattered AGN light. We find that ∼90 per cent of the type II quasar host galaxies require the inclusion of a YSP to adequately model their spectra, whilst 71 per cent of the sample require the inclusion of a YSP with age <100 Myr. Since the ages of the YSP in most type II quasar host galaxies are comparable with the expected lifetimes of the AGN activity, these results provide strong evidence that the quasars are triggered close to the peaks of the merger-induced starbursts.
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