论文标题
低红移1型AGN中的恒星速度分散量是否比2型AGN中的恒星速度分散体？
Are there larger stellar velocity dispersions in low redshift Type-1 AGN than in Type-2 AGN?
论文作者
论文摘要
主要目的是检查统一模型（UM）预期的类型1 AGN和2型AGN之间的类似恒星速度分散，然后为BH质量特性提供更多线索。 Not similar as previous comparisons of BH masses estimated by \msig relations to Type-2 AGN but Virial BH masses in Type-1 AGN, reliable stellar velocity dispersions $σ$ measured through absorption features around 4000Å~ are directly compared between so-far the largest samples of 6260 low redshift ($z~<~0.3$) Type-1 AGN and almost all the Type-2 AGN in SDSS DR12. Although half of Type-1 AGN do not have measured $σ$ due to unapparent absorption features overwhelmed by AGN activities, both properties of mean spectra of Type-1 AGN with and without measured $σ$ and positive dependence of $σ$ on [O~{\sc iii}] luminosity can lead to statistically larger $σ$ of all the Type-1 AGN than the 6260 Type-1 AGN with measured stellar速度分散。然后，在考虑了不同的红移和不同的中央AGN活动的必要效果之后，直接$σ$比较可以导致统计上较大的$σ$，其置信水平高于10sigma。尽管1型AGN的$σ$仅大约$（9 \ pm3）$ \％比2型AGN大，但在当前阶段无法很好地解释差异。除非有强有力的证据支持不同的\ msig关系或支持1型AGN和2型AGN之间的完全不同的进化历史，否则统计上较大的1型AGN $σ$为AGN的统一模型提供了巨大的挑战。
The main objective is to check the Unified Model (UM) expected similar stellar velocity dispersions between Type-1 AGN and Type-2 AGN, then to provide further clues on BH mass properties. Not similar as previous comparisons of BH masses estimated by \msig relations to Type-2 AGN but Virial BH masses in Type-1 AGN, reliable stellar velocity dispersions $σ$ measured through absorption features around 4000Å~ are directly compared between so-far the largest samples of 6260 low redshift ($z~<~0.3$) Type-1 AGN and almost all the Type-2 AGN in SDSS DR12. Although half of Type-1 AGN do not have measured $σ$ due to unapparent absorption features overwhelmed by AGN activities, both properties of mean spectra of Type-1 AGN with and without measured $σ$ and positive dependence of $σ$ on [O~{\sc iii}] luminosity can lead to statistically larger $σ$ of all the Type-1 AGN than the 6260 Type-1 AGN with measured stellar velocity dispersions. Then, direct $σ$ comparisons can lead to statistically larger $σ$ in Type-1 AGN, with confidence level higher than 10sigma, after considering necessary effects of different redshift and different central AGN activities. Although Type-1 AGN have $σ$ only about $(9\pm3)$\% larger than Type-2 AGN, the difference cannot be well explained at current stage. Unless there was strong evidence to support different \msig relations or to support quite different evolution histories between Type-1 AGN and Type-2 AGN, the statistically larger $σ$ in Type-1 AGN provides a strong challenge to the Unified model of AGN.
