The near-infrared host galaxy properties of radio-quiet "red AGN"

射电安静的“红色活动星系核”的近红外主星系特性

• 批准号: 5412658
• 负责人: Dr. Knud Jahnke
• 金额: --
• 依托单位: Max-Planck-Institut für Astronomie (MPIA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5412658?language=en
• 关键词: near; infrared; host; galaxy; properties

We want to study the nature of radio-quiet "red Active Galactic Nuclei" (AGN), i.e. quasars exibiting particularly red optical to near-infrared colours B-K bigger larger then 4. Two explanations have been put forward to explain these: extinction of the blue part of the spectrum due to dust in the host galaxy of the quasar, and second, a strong stellar near-infrared contribution of the host galaxy itself. In the context of "hidden quasars", a large fraction of AGN burried inside dust-enshrouded galaxies could be missed by traditional optical surveys. To tackle the question of the properties and light contribution of the host galaxies we successfully proposed to observe a sample of radio-quiet quasars with B-K larger than 4 at the Nordic Optical Telescope (NOT). In collaboration with swedish and british collaborators we were awarded time at the NOT to observe a unique data set of nine such objects, in the nearinfrared. A detailed morphological analysis will enable us to quantify the contribution of the host galaxy emission in this wavelength band and the object's possible morphological differences to "normal", blue quasars.

我们想研究无线电安静的“红色活动星系核”（AGN）的性质，即表现出特别红色光学到近红外颜色的类星体，B-K大于4。有两种解释可以解释这些现象：一是类星体的宿主星系中的尘埃导致光谱中蓝色部分的消光，二是宿主星系本身对恒星近红外的强烈贡献。在“隐藏类星体”的背景下，很大一部分活动星系核埋在尘埃笼罩的星系中，可能会被传统的光学观测所错过。为了解决宿主星系的性质和光贡献的问题，我们成功地提出了在北欧光学望远镜（NOT）上观测一个B-K大于4的射电宁静类星体样本。在与瑞典和英国合作者的合作中，我们获得了时间，在近红外线上观察九个这样的物体的独特数据集。一个详细的形态分析将使我们能够量化的贡献，在这个波段的主机星系发射和对象的可能形态差异，以“正常”，蓝色类星体。