论文标题
与JWST开设高红移时代的Quasar主机研究时代
Opening the era of quasar host studies at high redshift with JWST
论文作者
论文摘要
我们用$ z \ sim 1.6-3.5 $从SDSS和AEGIS中选择的五个类星体的主机星系属性进行测量，它们属于JWST/HST CEERS调查区域。 PSF库是根据数据的完整视野中的恒星构建的，并与二维图像建模工具齐射一起使用，以分解了Quasar及其主机，并使用可用于HST ACS+WFC3和JWST NiRCAM的多波段过滤器（12个覆盖HST F606W到JWST for JWST F444W）。如前所述，JWST提供了第一个以$ z> 3 $检测类星体宿主的能力，并在形态结构（Spiral Arms，bar）中对基础恒星种群进行了空间分辨的研究。总体而言，我们发现类星体寄主是磁盘状的，缺乏合并特征，并且大小通常比典型的恒星质量质量的典型星系更紧凑，因此与较低的红移的结果一致。 SDSSJ1420+5300A在$ z = 1.646 $中的偶然面对面取向使我们能够在中央$ 2-4 $ kpc区域中找到更高的星形形成和年轻年龄相对于郊区，这可能有助于解释Quasar宿主的相对紧凑性，并对AGN反馈模型构成挑战。
We measure the host galaxy properties of five quasars with $z\sim 1.6 - 3.5$ selected from SDSS and AEGIS, which fall within the JWST/HST CEERS survey area. A PSF library is constructed based on stars in the full field-of-view of the data and used with the 2-dimensional image modeling tool galight to decompose the quasar and its host with multi-band filters available for HST ACS+WFC3 and JWST NIRCAM (12 filters covering HST F606W to JWST F444W). As demonstrated, JWST provides the first capability to detect quasar hosts at $z>3$ and enables spatially-resolved studies of the underlying stellar populations at $z\sim2$ within morphological structures (spiral arms, bar) not possible with HST. Overall, we find quasar hosts to be disk-like, lack merger signatures, and have sizes generally more compact than typical star-forming galaxies at their respective stellar mass, thus in agreement with results at lower redshifts. The fortuitous face-on orientation of SDSSJ1420+5300A at $z = 1.646$ enables us to find higher star formation and younger ages in the central $2-4$ kpc region relative to the outskirts, which may help explain the relatively compact nature of quasar hosts and pose a challenge to AGN feedback models.
