一个位于恒星形成星系中的新生AGN
A Newborn AGN in a Starforming Galaxy
AI总结：
本研究从非活动星系样本中筛选出黑洞点燃候选体，通过SOAR望远镜观测证实一个恒星形成星系中出现了新生AGN，并结合多波段数据表征了其7年以上的演化过程。
摘要：
我们报道了一例新生AGN（活动星系核）的发现，即一个此前被归类为非活动的星系当前出现了AGN活动，并对其演化过程进行了表征。我们从经光谱分类的非活动星系母样本（2394312个天体）中筛选黑洞点燃事件候选体，根据ALeRCE光变分类器的结果，这些候选体当前表现出指示I型AGN的光学流量变化。我们利用SOAR望远镜获取了新生AGN候选样本的第二历元光谱，以搜寻新的AGN特征。我们展示了最具说服力的新AGN活动案例的光谱结果：该星系此前的光学分类为恒星形成星系，其第二历元光谱中出现了显著的宽巴耳末线，而窄线流量比未发生显著变化。长期光学光变曲线显示，其光度在SDSS光谱获取1.5年后开始持续上升，且至少持续了7年。来自WISE星表的中红外颜色也已从典型的非活动星系颜色演变为类AGN颜色，近期的X射线流量探测结果证实了其AGN本质。
英文摘要：
We report on the finding of a newborn AGN, i.e. current AGN activity in a galaxy previously classified as non-active, and characterize its evolution. Black hole ignition event candidates were selected from a parent sample of spectrally classified non-active galaxies (2.394.312 objects), that currently show optical flux variability indicative of a type I AGN, according to the ALeRCE light curve classifier. A second epoch spectrum for a sample of candidate newborn AGN were obtained with the SOAR telescope to search for new AGN features. We present spectral results for the most convincing case of new AGN activity, for a galaxy with a previous star-forming optical classification, where the second epoch spectrum shows the appearance of prominent, broad Balmer lines without significant changes in the narrow line flux ratios. Long term optical lightcurves show a steady increase in luminosity starting 1.5 years after the SDSS spectrum was taken and continuing for at least 7 years. MIR colors from the WISE catalog have also evolved from typical non active galaxy colors to AGN-like colors and recent X-ray flux detections confirm its AGN nature.
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