Clear evidence for the early triggering of a luminous quasar-like active galactic nuclei in a major, gas-rich merger

Clear evidence for the early triggering of a luminous quasar-like active galactic nuclei in a major, gas-rich merger
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明确的证据表明,在一次富含气体的大型合并中,早期触发了类发光类星体活动星系核

DOI:
10.1093/mnras/stt2333
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发表时间:
2014
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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我们给出了SDSS II型类星体J002531-104022的深、中分辨率、长狭缝双子座GMOS-S光谱,这是一个目前正在经历重大合并事件的高度扰动系统。我们使用这些数据来模拟三个不同空间区域的恒星群的年龄和红化,并发现在占主导地位的年轻恒星群(YSP)的特性中具有显着的均匀性。这些ysp都有相对年轻的年龄(tysp < 40$ Myr),强烈暗示最新的恒星形成和类星体活动几乎是同时触发的。从连续体模型和测量的巴尔默衰减(E(B-V) <0.3)推断,没有变红表明星暴和/或AGN引起的流出已经有效地从中心区域清除了相当大比例的气体和尘埃。这些发现与模型预测形成了鲜明的对比,模型预测表明,在合并引起的恒星形成高峰和光学可见类星体活动的出现之间有几个100 Myr的偏移。根据我们的恒星人口拟合,我们还表明,恒星的总质量在(4 - 17)× 10^10太阳质量的范围内,低于类星体宿主星系的典型质量。
We present deep, intermediate resolution, long slit Gemini GMOS-S optical spectra of the SDSS type II quasar J002531-104022, which is a highly disturbed system currently undergoing a major merger event. We use these data to model the ages and reddenings of the stellar populations in three distinct spatial regions and find a remarkable uniformity in the properties of the young stellar populations (YSP) that dominate the optical spectra. The YSPs are all found to have relatively young ages (tysp < 40$ Myr), strongly implying that the latest episode of star formation and quasar activity have been triggered quasi-simultaneously. The lack of reddening deduced from both continuum modelling and the measured Balmer decrements (E(B-V) <0.3) suggests that starburst and/or AGN induced outflows have already effectively removed a substantial proportion of the gas and dust from the central region. These findings starkly contrast with model predictions which suggest an offset of a few 100 Myr between the peak of merger induced star formation and the emergence of the optically visible quasar activity. Based on our stellar population fits we also show that the total stellar mass is in the range (4 - 17) X 10^10 solar masses, lower than typically found for quasar host galaxies.
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