论文标题
低红移类星体的宿主星系的星形主序列
The Star-forming Main Sequence of the Host Galaxies of Low-redshift Quasars
论文作者
论文摘要
我们研究了453个红移$ \ sim $ 0.3类星体的大型，定义明确的样品的主宿主星系的恒星主要序列，并通过从建模其宽带（$ grizy $）光谱能量的模型中导出出色的恒星形成速率。我们执行二维，同时的，多滤波器的分解1 3 $π$ steradian调查图像，以首次显式考虑星系结构的波长变化，从其宿主星系中脱离了活性的银河系核（AGN）。我们量化了来自真实和理想化星系产生的模拟AGN的宿主星系的Sérsic曲线和大小。使用哈勃太空望远镜图像的校准星系样品的详细形态学分类使我们能够估计类星体的粗略形态类型。 Although the majority ($\sim$60%) of the quasars are hosted by bulge-dominated, early-type galaxies, a substantial fraction ($\sim$40%) reside in disk-dominated, late-type galaxies, suggesting that at least in these systems major mergers have not played a significant role in regulating their AGN activity, in agreement with recent simulations and observations of nearby quasars.绝大多数（$ \ sim $ 90％）的类星体形成速率将它们置于或之上或之上，而恒星形成的主序列则更快地积聚了AGN，而AGN的流动进一步超过了主序列。 Quasar宿主星系通常遵循由不活跃星系定义的恒星质量关系，无论是晚期和早期型系统，但大约1/3的人口在给定的恒星质量下具有较小的大小，使人联想到较高的红色速度的紧凑型星形形成星系。
We investigate the star-forming main sequence of the host galaxies of a large, well-defined sample of 453 redshift $\sim$0.3 quasars with previously available star formation rates by deriving stellar masses from modeling their broad-band ($grizy$) spectral energy distribution. We perform two-dimensional, simultaneous, multi-filter decomposition of Pan-STARRS1 3$π$ Steradian Survey images to disentangle the active galactic nucleus (AGN) from its host galaxy, by explicitly considering, for the first time, the wavelength variation of galaxy structures. We quantify the Sérsic profiles and sizes of the host galaxies from mock AGNs generated from both real and idealized galaxies. Detailed morphological classifications of the calibration galaxy sample with Hubble Space Telescope images enable us to estimate crude morphological types of the quasars. Although the majority ($\sim$60%) of the quasars are hosted by bulge-dominated, early-type galaxies, a substantial fraction ($\sim$40%) reside in disk-dominated, late-type galaxies, suggesting that at least in these systems major mergers have not played a significant role in regulating their AGN activity, in agreement with recent simulations and observations of nearby quasars. The vast majority ($\sim$90%) of the quasars have star formation rates that place them on or above the galaxy star-forming main sequence, with more rapidly accreting AGNs displaced further above the main sequence. Quasar host galaxies generally follow the stellar mass-size relation defined by inactive galaxies, both for late-type and early-type systems, but roughly 1/3 of the population has smaller sizes at a given stellar mass, reminiscent of compact star-forming galaxies at higher redshift.
