论文标题
Glass-JWST的早期结果。 IX：与Niriss一起使用$ z> 2 $的低质量静态星系的第一光谱确认
Early results from GLASS-JWST. IX: First spectroscopic confirmation of low-mass quiescent galaxies at $z>2$ with NIRISS
论文作者
论文摘要
被动星系的形成方式以及防止长时间尺度恒星形成的物理机制是理解星系进化的一些最杰出的问题。在宇宙时间内，静态星系的特性提供了至关重要的信息来识别淬火机制。被动星系已被确认并研究到$ z \ sim4 $，但是所有这些研究都仅限于大型系统（主要使用$ \ log {（M _ {\ rm star}/m _ {\ odot}}}}> 10.8 $）。使用James Webb太空望远镜（JWST）Niriss Grism Slitshless slits slits slits slits propstroscic数据，我们向$ z {\ rm spec} = 2.650 = 2.650^{+0.004} {+0.004} _ { - 0.006} _ { - 0.006} $和$ z _ _ { spec} = 2.433^{+0.032} _ { - 0.016} $（3 $σ$ errors），其恒星质量为$ \ log {（M _ {\ rm star}/m _ {\ odot}} $ \ log {（m _ {\ rm star}/m _ {\ odot}）} = 9.93^{+0.06} _ { - 0.07} $（分别分别为$μ= 2.0 $和$μ= 2.1 $的放大因子更正了）。后者代表了对宇宙中午低质量静态星系存在的首次光谱证实，展示了JWST识别和表征这一神秘人群的力量。
How passive galaxies form, and the physical mechanisms which prevent star formation over long timescales, are some of the most outstanding questions in understanding galaxy evolution. The properties of quiescent galaxies over cosmic time provide crucial information to identify the quenching mechanisms. Passive galaxies have been confirmed and studied out to $z\sim4$, but all of these studies have been limited to massive systems (mostly with $\log{(M_{\rm star}/M_{\odot})}>10.8$). Using James Webb Space Telescope (JWST) NIRISS grism slitless spectroscopic data from the GLASS JWST ERS program, we present spectroscopic confirmation of two quiescent galaxies at $z_{\rm spec}=2.650^{+0.004}_{-0.006}$ and $z_{\rm spec}=2.433^{+0.032}_{-0.016}$ (3$σ$ errors) with stellar masses of $\log{(M_{\rm star}/M_{\odot})}=10.53^{+0.18}_{-0.06}$ and $\log{(M_{\rm star}/M_{\odot})}=9.93^{+0.06}_{-0.07}$ (corrected for magnification factors of $μ=2.0$ and $μ=2.1$, respectively). The latter represents the first spectroscopic confirmation of the existence of low-mass quiescent galaxies at cosmic noon, showcasing the power of JWST to identify and characterize this enigmatic population.
