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arXiv 1806.09083astro-ph.GA
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斯隆数字巡天混响测绘计划:来自图像分解的$z < 0.8$的类星体主星系

The Sloan Digital Sky Survey Reverberation Mapping Project: Quasar Host Galaxies at $z < 0.8$ from Image Decomposition

Minghao Yue, Linhua Jiang, Yue Shen, Patrick B. Hall, Zhefu Yu, Donald P. Schneider, Luis C. Ho, Keith Horne, Patrick Petitjean, Jonathan R. Trump

摘要:

我们提出了从斯隆数字巡天混响映射项目的低红移宽线类星体宿主星系的静止框架紫外和光学光度学和形态。我们的样本由103个$z<0.8$类星体组成,亮度范围为$-25\le M_g\le -17$ ma。我们将加拿大-法国-夏威夷望远镜拍摄的$g$和$i$波段的多历元图像进行叠加。组合的$g$带($i$带)图像达到26.2(25.2)mag的$5σ$深度,典型PSF大小为$0.7"$($0.6"$)。每个类星体被分解成一个PSF和一个Sérsic轮廓,分别代表中央AGN和宿主星系的组成部分。两个波段的主星系流量测量值的系统误差分别为0.23和0.18 mag.星系半光半径($R_e$)测量值的相对误差约为13%.我们估计了宿主星系的静止坐标系$u$ -和$g$ -带通量,发现$g$带的活动星系核与星系的通量比在0.9到4.4之间(68.3%置信度)。这些星系具有很高的恒星质量$M_\ast = 10^{10}\sim10^{11}\, M_\odot$。它们与恒星形成星系在类似的红移下具有相似的颜色,与这些类星体中的AGN正反馈一致。我们发现,在我们的样本中的$M_*-M_\text{BH}$关系是浅于本地的$M_\text{Bulge}-M_\text{BH}$关系。Sérsic指数和$M_*-R_e$关系表明,大多数宿主星系都是盘状的。

英文摘要:

We present the rest-frame UV and optical photometry and morphology of low-redshift broad-line quasar host galaxies from the Sloan Digital Sky Survey Reverberation Mapping project. Our sample consists of 103 quasars at $z<0.8$, spanning a luminosity range of $-25\le M_g\le -17$ mag. We stack the multi-epoch images in the $g$ and $i$ bands taken by the Canada-France-Hawaii Telescope. The combined $g$-band ($i$-band) images reach a $5σ$ depth of 26.2 (25.2) mag, with a typical PSF size of $0.7"$ ($0.6"$). Each quasar is decomposed into a PSF and a Sérsic profile, representing the central AGN and the host galaxy components, respectively. The systematic errors of the measured host galaxy flux in the two bands are 0.23 and 0.18 mag. The relative errors of the measured galaxy half-light radii ($R_e$) are about 13%. We estimate the rest-frame $u$- and $g$-band flux of the host galaxies, and find that the AGN-to-galaxy flux ratios in the $g$ band are between 0.9 to 4.4 (68.3% confidence). These galaxies have high stellar masses $M_\ast = 10^{10}\sim10^{11}\, M_\odot$. They have similar color with star-forming galaxies at similar redshifts, in consistent with AGN positive feedback in these quasars. We find that the $M_*-M_\text{BH}$ relation in our sample is shallower than the local $M_\text{Bulge}-M_\text{BH}$ relation. The Sérsic indices and the $M_*-R_e$ relation indicate that the majority of the host galaxies are disk-like.

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