DREAMS：测量红移约11的大质量星系温度
DREAMS: Taking the Temperature of a Massive Galaxy at z ~ 11
浏览论文内容
中文总结 AI 辅助
本研究通过JWST观测分析红移约11的星系Janus-11，测量其质量、尘埃、金属丰度等性质，发现其处于红怪物向蓝怪物过渡阶段，为早期大质量星系演化提供新证据。
中文摘要 AI 辅助
我们对Janus-11进行了详细的光度学和光谱学分析，这是一个红移$z=10.7933 \pm 0.0006$的星系，被星系团MACS J0416放大1.6倍。该星系作为PEARLS计划的一部分由JWST/NIRCam观测，并作为DREAMS计划的一部分由JWST/NIRSpec MSA观测。其紫外绝对星等M$_{\rm UV}=-19.78^{+0.12}_{-0.11}$，恒星质量log(M*/M_sun) = 8.75 (+0.08/-0.10)，使其跻身已知$z>10$星系中最庞大之列，而其$A_V=0.54\pm0.09$星等和紫外斜率$\beta=-1.71\pm0.26$与红怪物分类相符，尽管它属于该群体中遮蔽最少的成员之一：这可能暗示从红怪物阶段向蓝怪物阶段的过渡。此外，[OIII]4363的探测使得基于[OIII]4363直接方法测量的最高红移金属丰度达到$12 + \log(O/H) = 7.74^{+0.11}_{-0.10}$，同时电子温度$T_e$(O$^{++}$) = $(2.1 \pm 0.2)\times10^4$ K。其空间分辨特性，有效半径$136 \pm 9$ pc，加上发射线的窄半高全宽（$\lesssim 230$ km s$^{-1}$，或$\sigma_v \lesssim 100$ km s$^{-1}$），以及缺乏高电离发射线和宽成分的显著探测，支持恒星形成星系（SFG）分类，尽管不能排除活动星系核（AGN）的贡献。Janus-11加入了$z>10$光谱确认和表征源的小样本，为这一时代具有不可忽视尘埃消光且金属丰度测量良好的大质量系统提供了新信息。
英文摘要
We present a detailed photometric and spectroscopic analysis of Janus-11, a $z=10.7933 \pm 0.0006 $ galaxy magnified by a factor 1.6 by the galaxy cluster MACS J0416. It was observed with JWST/NIRCam as part of the PEARLS program and with JWST/NIRSpec MSA as part of the DREAMS program. It has M$_{\rm UV}=-19.78^{+0.12}_{-0.11}$, and its stellar mass of log(M*/M_sun) = 8.75 (+0.08/-0.10) places it among the most massive known $z>10$ galaxies, while its $A_V=0.54\pm0.09$ mag and UV slope of $β=-1.71\pm0.26$ are compatible with a red monster classification, albeit among the least obscured members of this population: this could hint at a transition from the red monster to the blue monster phase. Moreover, the [OIII]4363 detection allows for the highest-redshift metallicity measurement based on the [OIII]4363 direct method to date of $12 + \log(O/H) = 7.74^{+0.11}_{-0.10}$, together with an electron temperature of $T_e$(O$^{++}$) = $(2.1 \pm 0.2)\times10^4$ K. Its spatially resolved nature, with an effective radius of $136 \pm 9$ pc, together with the narrow FWHM of the emission lines ($\lesssim 230$ km s$^{-1}$, or $σ_v \lesssim 100$ km s$^{-1}$), and the lack of significant detections of high-ionization emission lines and broad components, favor an SFG classification, although an AGN contribution cannot be excluded. Janus-11 joins the small sample of spectroscopically confirmed and characterized sources at $z>10$, providing new information on massive systems with non-negligible dust attenuation and well-measured metallicity in this epoch.
发表机构
- Università degli Studi di Bologna（博洛尼亚大学）
- INAF – OAS, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna（意大利国家天体物理研究所-博洛尼亚天文与空间科学台）
- Institute of Liberal Arts and Science, Kanazawa University（金泽大学人文学部）
- National Astronomical Observatory of Japan（日本国立天文台）
- The University of Tokyo（东京大学）
- SOKENDAI（综合研究大学院大学）
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo（东京大学 Kavli宇宙物理数学研究所（WPI））
- Arizona State University（亚利桑那州立大学）
机构由 AI 辅助整理，请以论文原文为准。
