星系点亮：七十个新发现的点亮型改变视线类星体
Galaxies Lighting Up: Discovery of Seventy New Turn-on Changing-look Quasars
AI总结：
本研究通过光谱分类星系的光学与中红外剧变，新发现70个“点亮型”改变视线类星体，揭示其源于黑洞吸积率变化，并分析了宿主星系性质。
摘要：
“改变视线类星体”（CLQs）发现于不到十年前，在光学/紫外连续谱和宽线发射上表现出剧烈且快速的变化。由于大多数选择方法从光谱确认的类星体样本出发，已发现的大多数CLQs是变暗的“熄灭型”CLQs。我们在此展示一个包含82个光谱确认的“点亮型”CLQs的样本，其中70个是新发现的。这些点亮型CLQs是从光谱分类的星系中选出的，它们在光学和中红外波段随后表现出显著且剧烈的变光，这表明其机制是超大质量黑洞吸积率的改变，而非可变遮挡。基于亮态爱丁顿比率，与具有类似红移和星等分布的熄灭型CLQs或典型SDSS类星体相比，点亮型CLQs对应较低的吸积率，尽管其黑洞质量较低。大多数点亮型CLQs位于遵循中心黑洞质量与宿主星系性质（如恒星质量和速度弥散）之间局域关系的宿主星系中。然而，其宿主星系的质量高于正常非活动星系，且恒星形成率与Type 2 AGN宿主更相似，而非整体星系群。
英文摘要：
"Changing-look quasars" (CLQs), discovered less than a decade ago, show dramatic, rapid changes in optical/UV continuum and broad line emission. The majority of CLQs have been found dimming as "turn-off" CLQs because most selection methods start from samples of spectroscopically-confirmed quasars. We present here a sample of 82 spectroscopically confirmed "turn-on" CLQs, 70 of which are newly identified. The turn-on CLQs are selected from spectroscopically classified galaxies with subsequent significant and dramatic variability in both the optical and mid-infrared bands, indicating a mechanism of changing accretion rate of the supermassive black holes rather than variable obscuration. Based on their bright state Eddington ratios, turn-on CLQs are associated with lower accretion rates compared to turn-off CLQs or typical SDSS quasars with similar redshift and magnitude distributions, even though turn-on CLQs have lower black hole masses. Most turn-on CLQs reside in host galaxies that follow local relations between the central black hole mass and host galaxy properties, such as stellar mass and velocity dispersion. However, their host galaxies have higher mass than normal inactive galaxies, with star formation rates more similar to hosts of Type 2 AGN than to the overall galaxy population.
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