Adaptive Optics Imaging of Low-Redshift Damped Lyα Quasar Absorbers
Adaptive Optics Imaging of Low-Redshift Damped Lyα Quasar Absorbers
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低红移阻尼 Lyα 类星体吸收体的自适应光学成像
DOI：
10.1086/499299
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Takamiya
中科院分区：
文献类型：
--
作者：
M. Chun;S. Gharanfoli;V. Kulkarni;M. Takamiya
我们使用 Hokupa'a 自适应光学系统和双子座北望远镜上的快速红外相机，对 z < 0.5 处具有七个强吸收线系统的六个类星体的场进行了高角分辨率近红外成像研究。这些吸收系统包括四个经典阻尼 Lyα 吸收器 (DLA)、两个子 DLA 和一个莱曼极限系统。图像是在半高宽在 0.″2 和 0.″5 之间的 H 或 K' 滤波器中获得的，目的是检测吸收星系并识别它们的形态。在距类星体 0.″5-16.″0 的投影间距处可以看到特征，并且所有场都显示出间距小于 2″ 的特征。我们在所有七个系统中都找到了候选吸收器。假设其中一些与吸收体相关，则吸收体为低光度≤0.1L或L；我们在任何领域都没有发现任何大型、明亮的候选吸收体。有些场显示出紧凑的特征，对于定量形态来说太微弱，但可能出现在矮星系中。
We have carried out a high angular resolution near-infrared imaging study of the fields of six quasars with seven strong absorption-line systems at z < 0.5, using the Hokupa'a adaptive optics system and the Quick Infrared Camera on the Gemini North telescope. These absorption systems include four classical damped Lyα absorbers (DLAs), two sub-DLAs, and one Lyman limit system. Images were obtained in the H or K′ filters with FWHM between 0.″2 and 0.″5 with the goal of detecting the absorbing galaxies and identifying their morphologies. Features are seen at projected separations of 0.″5-16.″0 from the quasars, and all the fields show features at less than 2″ separation. We find candidate absorbers in all seven systems. With the assumption that some of these are associated with the absorbers, the absorbers are low-luminosity ≤0.1L or L; we do not find any large, bright candidate absorbers in any of our fields. Some fields show compact features that are too faint for quantitative morphology but could arise in dwarf galaxies.