论文标题
Far-Ir AGN和非AGN绿谷星系样本的恒星种群
Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies
论文作者
论文摘要
我们介绍了一项关于Mahoro等人分析的远红外AGN和非AGN绿谷子样本的恒星种群和恒星年龄的研究。 （2017,2019）在0.6 <z <1.0时使用来自Cosmos字段的数据。我们使用恒星种群合成代码“星光”使用了长期光谱光谱和衍生的恒星种群和出色的年龄，并分析了可用的Lick/IDS索引，例如DN4000和$ \ rm {hΔ__{a a}} $。我们发现，FIR AGN和非AGN绿色谷星系分别以中间恒星种群为主，分别为67％和53％。 AGN和非AGN的恒星年龄分别为log t = 8.5 [yr]和log t = 8.4 [yr]。我们发现，大多数来源（占AGN的62％和66％的非AGN）可能会经历爆发和连续的恒星形成。此外，与FIR非AGN相比，我们的大多数FIR AGN（38％）（27％）可能经历了超过0.1 GYR的SF爆发。我们还发现，我们的FIR AGN和非AGN绿色谷星系具有〜70 Myr的类似淬火时间尺度。因此，此处获得的结果与我们先前的结果一致，在该结果中我们没有发现绿谷中的FIR AGN样本显示出负AGN反馈的迹象，正如先前在光学研究中所建议的那样。
We present a study on the stellar populations and stellar ages of sub-sample of far-infrared AGN and non-AGN green valley analysed in Mahoro et al. (2017,2019) at 0.6 < z < 1.0 using the data from the COSMOS field. We used long-slit spectroscopy and derived stellar populations and stellar ages using the stellar population synthesis code "STARLIGHT" and analysed the available Lick/IDS indices, such as Dn4000 and $\rm{Hδ_{A}}$. We find that both FIR AGN and non-AGN green valley galaxies are dominated by intermediate stellar populations 67 % and 53 %, respectively. The median stellar ages for AGN and non-AGN are log t = 8.5 [yr] and log t = 8.4 [yr], respectively. We found that majority of our sources (62 % of AGN and 66 % non-AGN) could have experienced bursts and continuous star formation. In addition, most of our FIR AGN (38 %) compared to FIR non-AGN (27 %) might have experienced a burst of SF more than 0.1 Gyr ago. We also found that our FIR AGN and non-AGN green valley galaxies have similar quenching time-scales of ~ 70 Myr. Therefore, the results obtained here are in line with our previous results where we do not find that our sample of FIR AGN in the green valley shows signs of negative AGN feedback, as has been suggested previously in optical studies.
