论文标题
Glass-JWST的早期结果。 VII：在哈勃前沿场A2744中z = 4处的镜头，重力结合的原始晶状体簇的证据
Early results from GLASS-JWST. VII: evidence for lensed, gravitationally bound proto-globular clusters at z=4 in the Hubble Frontier Field A2744
论文作者
论文摘要
我们研究了Hubble Frontier Fielder field Galaxy集群A2744使用Glass-ers JWST/NIRIRISS 1.15mum和1.50mum和1.50mum，我们研究了Z = 4的星系中的三个紧凑型星形区域的蓝色和光学休息尺寸（Lambda〜2300A-4000A），该区域在z = 4处（x30，x45，x100）。特别是，对于系统的所有乘积源，详细探测了Balmer的详细探测。 （YMC），具有恒星的质量表面密度，类似于局部球状簇（4000a，基于JWST）和紫外线（1600a，基于HST）的尺寸，这是完全兼容的紫外线（1600A）。休息框架，反映了年轻人（<30 Myr），从SED拟合中推断出来，由VLT/MUSE的高离子线的存在支持。形成。
We investigate the blue and optical rest-frame sizes (lambda~2300A-4000A) of three compact star-forming regions in a galaxy at z=4 strongly lensed (x30, x45, x100) by the Hubble Frontier Field galaxy cluster A2744 using GLASS-ERS JWST/NIRISS imaging at 1.15um, 1.50mu and 2.0mu with PSF < 0.1". In particular, the Balmer break is probed in detail for all multiply-imaged sources of the system. With ages of a few tens of Myr, stellar masses in the range (0.7-4.0) x 10^6 Msun and optical/ultraviolet effective radii spanning the interval 3 < R_eff < 20 pc, such objects are currently the highest redshift (spectroscopically-confirmed) gravitationally-bound young massive star clusters (YMCs), with stellar mass surface densities resembling those of local globular clusters. Optical (4000A, JWST-based) and ultraviolet (1600A, HST-based) sizes are fully compatible. The contribution to the ultraviolet underlying continuum emission (1600A) is ~30%, which decreases by a factor of two in the optical for two of the YMCs (~4000A rest-frame), reflecting the young ages (<30 Myr) inferred from the SED fitting and supported by the presence of high-ionization lines secured with VLT/MUSE. Such bursty forming regions enhance the sSFR of the galaxy, which is ~10 Gyr^-1. This galaxy would be among the extreme analogs observed in the local Universe having high star formation rate surface density and high occurrence of massive stellar clusters in formation.
