arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2207.09428astro-ph.GA
收藏

恐慌!在银河系:在$z > 3$用SMACS 0723场中的JWST对星系结构的第一次静止帧光学观测

Panic! At the Disks: First Rest-frame Optical Observations of Galaxy Structure at $z > 3$ with JWST in the SMACS 0723 Field

Leonardo Ferreira, Nathan Adams, Christopher J. Conselice, Elizaveta Sazonova, Duncan Austin, Joseph Caruana, Fabricio Ferrari, Aprajita Verma, James Trussler, … 展开作者

Leonardo Ferreira, Nathan Adams, Christopher J. Conselice, Elizaveta Sazonova, Duncan Austin, Joseph Caruana, Fabricio Ferrari, Aprajita Verma, James Trussler, Tom Broadhurst, Jose Diego, Brenda L. Frye, Massimo Pascale, Stephen M. Wilkins, Rogier A. Windhorst, Adi Zitrin

摘要:

我们提出了早期的结果,在早期发布的观测SMACS 0723,一个星系团在$z=0.39$的$z > 3$与詹姆斯韦伯太空望远镜看到的星系的形态和结构特性。我们调查,为第一次,在这一领域的准确光度红移的一个显着数量的$z > 3$星系的光学形态,以确定在相对早期的宇宙中的星系结构的形式。我们使用视觉形态和\textsc{Morfometryka}措施来进行定量形态测量,包括光轮廓拟合参数(Sérsic指数)和非参数(CAS值)。利用这些,我们测量的相对比例盘,球状体,和奇特的星系在$3 < z < 8$。我们发现了令人惊讶的结果,在$z > 1.5$盘星系占主导地位的整体分数的形态,与$\sim 10$的一个因素相对较高的盘星系的数量比哈勃太空望远镜在这些红移。我们对星系的视觉形态估计与它们在CAS参数空间中的位置及其Sérsic指数密切相关。

英文摘要:

We present early results regarding the morphological and structural properties of galaxies seen with the James Webb Space Telescope at $z > 3$ in the Early Release Observations of SMACS 0723, a galaxy cluster at $z=0.39$. We investigate, for the first time, the optical morphologies of a significant number of $z > 3$ galaxies with accurate photometric redshifts in this field to determine the form of galaxy structure in the relatively early universe. We use visual morphologies and \textsc{Morfometryka} measures to perform quantitative morphology measurements, both parametric with light profile fitting (Sérsic indices) and non-parametric (CAS values). Using these, we measure the relative fraction of disk, spheroidal, and peculiar galaxies at $3 < z < 8$. We discover the surprising result that at $z > 1.5$ disk galaxies dominate the overall fraction of morphologies, with a factor of $\sim 10$ relative higher number of disk galaxies than seen by the Hubble Space Telescope at these redshifts. Our visual morphological estimates of galaxies align closely with their locations in CAS parameter space and their Sérsic indices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑