论文标题
JWST/NIRISS Imaging的Abell 2744中超扩散星系的近红外表征
Near-infrared characterization of ultra-diffuse galaxies in Abell 2744 by JWST/NIRISS imaging
论文作者
论文摘要
我们提出了边境领域集群Abell 〜2744在$ z = 0.308 $的搜索和表征。我们使用JWST/Niriss F200W观测值，作为Glass-JWST早期发行科学计划的一部分，旨在表征群集UDG的形态及其弥漫性恒星组件。我们使用形态参数的选择标准确定了总数22个UDG，直到$ \ sim10^{7} m _ {\ odot} $的恒星质量。在F200W中，所选的UDG在有效半径上系统地比HST/ACS F814W图像更大，这意味着当在REST-FRAME光学波长中选择时，其中一些不会被鉴定为UDGS。实际上，我们发现大约三分之一的UDG先前未根据F814W数据识别。我们观察到恒星质量大小平面中UDG的平坦分布，类似于可比较质量下的簇静脉星系的平面分布。我们使用新的JWST F200W过滤器的试点研究展示了在宇宙学距离上搜索UDG的效率，其中1/30与HST进行了深入观察活动的1/30。 JWST专注于各个来源的空间分辨特性的进一步研究将为其起源提供见解。
We present a search and characterization of ultra-diffuse galaxies (UDGs) in the Frontier Fields cluster Abell~2744 at $z=0.308$. We use JWST/NIRISS F200W observations, acquired as part of the GLASS-JWST Early Release Science Program, aiming to characterize morphologies of cluster UDGs and their diffuse stellar components. A total number of 22 UDGs are identified by our selection criteria using morphological parameters, down to stellar mass of $\sim10^{7}M_{\odot}$. The selected UDGs are systematically larger in effective radius in F200W than in HST/ACS F814W images, which implies that some of them would not have been identified as UDGs when selected at rest-frame optical wavelengths. In fact, we find that about one third of the UDGs were not previously identified based on the F814W data. We observe a flat distribution of the UDGs in the stellar mass-size plane, similar to what is found for cluster quiescent galaxies at comparable mass. Our pilot study using the new JWST F200W filter showcases the efficiency of searching UDGs at cosmological distances, with 1/30 of the exposure time of the previous deep observing campaign with HST. Further studies with JWST focusing on spatially-resolved properties of individual sources will provide insight into their origin.
