论文标题
JWST NIRSPEC光谱揭示的，在3 <z <4处的微弱，旧和巨大的静态星系
A population of faint, old, and massive quiescent galaxies at 3 < z < 4 revealed by JWST NIRSpec Spectroscopy
论文作者
论文摘要
在这里，我们在Z〜3-4的Z〜3-4中介绍了12个大规模静止星系候选，并在红外光谱仪（NIRSPEC）附近观察到James Webb空间望远镜（JWST）。这些星系是从哈勃太空望远镜成像中预选的，我们的10个来源无法通过基于地面的光谱法对光谱进行确认。通过将NIRSPEC的光谱数据与来自JWST近红外摄像机（NIRCAM）的多波长成像数据相结合，我们分析了它们的恒星种群及其地层历史。我们发现，我们所有的星系都基于其恒星形成历史的重建而归类为静止，但显示了各种淬火的时间尺度和年龄。我们所有的星系都是巨大的（$ \ sim0.1-1.2 \ times 10^{11} m \ odot $），质量与本地宇宙中的大型星系相当。我们发现，样本中最古老的银河系是$ \ sim1.0 \ times10^{11} m \ odot $ ass Mass的质量，在宇宙的前几亿年内，到Z $ \ sim $ 3.2（$ \ sim \ sim $ \ sim $ \ 20亿年）之后，在观察到的时间超过了十亿年。我们的结果表明，大规模星系的早期形成需要高度转化为早期宇宙中的恒星。
Here we present a sample of 12 massive quiescent galaxy candidates at z~3-4 observed with the James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec). These galaxies were pre-selected from the Hubble Space Telescope imaging and 10 of our sources were unable to be spectroscopically confirmed by ground based spectroscopy. By combining spectroscopic data from NIRSpec with multi-wavelength imaging data from the JWST Near Infrared Camera (NIRCam), we analyse their stellar populations and their formation histories. We find that all of our galaxies classify as quiescent based on the reconstruction of their star formation histories but show a variety of quenching timescales and ages. All our galaxies are massive ($\sim0.1-1.2 \times 10^{11} M\odot$), with masses comparable to massive galaxies in the local Universe. We find that the oldest galaxy in our sample formed $\sim1.0\times10^{11} M\odot$ of mass within the first few hundred million years of the Universe and has been quenched for more than a billion years by the time of observation at z$\sim$3.2 ($\sim$2 billion years after the Big Bang). Our results point to very early formation of massive galaxies requiring a high conversion rate of baryons to stars in the early Universe.
