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arXiv 2310.01276astro-ph.GA
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UNCOVER巡天:覆盖$0.2 \lesssim z \lesssim 15$的星系红移与恒星族属性的HST+JWST初步星表

The UNCOVER Survey: A First-look HST+JWST Catalog of Galaxy Redshifts and Stellar Population Properties Spanning $0.2 \lesssim z \lesssim 15$

Bingjie Wang, Joel Leja, Ivo Labbé, Rachel Bezanson, Katherine E. Whitaker, Gabriel Brammer, Lukas J. Furtak, John R. Weaver, Sedona H. Price, Adi Zitrin, Hakim… 展开作者

Bingjie Wang, Joel Leja, Ivo Labbé, Rachel Bezanson, Katherine E. Whitaker, Gabriel Brammer, Lukas J. Furtak, John R. Weaver, Sedona H. Price, Adi Zitrin, Hakim Atek, Dan Coe, Sam E. Cutler, Pratika Dayal, Pieter van Dokkum, Robert Feldmann, Danilo Marchesini, Marijn Franx, Natascha Förster Schreiber, Seiji Fujimoto, Marla Geha, Karl Glazebrook, Anna de Graaff, Jenny E. Greene, Stéphanie Juneau, Susan Kassin, Mariska Kriek, Gourav Khullar, Michael Maseda, Lamiya A. Mowla, Adam Muzzin, Themiya Nanayakkara, Erica J. Nelson, Pascal A. Oesch, Camilla Pacifici, Richard Pan, Casey Papovich, David J. Setton, Alice E. Shapley, Renske Smit, Mauro Stefanon, Katherine A. Suess, Edward N. Taylor, Christina C. Williams

AI总结:

UNCOVER JWST巡天利用Abell 2744的强引力透镜,用Prospector框架拟合5万余源的测光数据,得到z~15内高精度测光红移与恒星族属性,公开发布含后验分布等的星表,助力星系演化研究。

摘要:

近期利用詹姆斯·韦布空间望远镜(JWST)开展的UNCOVER巡天,借助强引力透镜效应,以近邻星系团Abell 2744为透镜,获取了迄今最深的宇宙观测图像。本研究对超过50000个红移至$z \sim 15$的可靠探测源进行了测光拟合,展示了在$0.2 \lesssim z \lesssim 15$的完整红移范围内,恒星年龄、恒星形成率以及静止系颜色的演化规律。研究采用Prospector贝叶斯推断框架推导星系属性,使用包含质量与恒星形成历史先验信息的Prospector-$β$先验,联合得到红移与恒星族的后验分布;同时实时计算引力透镜放大倍数,确保与尺度相关的先验保持一致。结果表明,该方法得到的测光红移精度优异,$σ_{\rm NMAD} \sim 0.03$,质量与成熟的测光红移代码EAzY相当。遵循Treasury巡天的开源科学目标,本文同步公开发布恒星族星表,该星表基于测光星表构建,根据源的轮廓调整了孔径尺寸。发布内容包含后验矩、最大似然光谱、恒星形成历史以及完整后验分布,为探究JWST可及参数空间内的星系形成与演化过程提供了丰富的数据集。

英文摘要:

The recent UNCOVER survey with the James Webb Space Telescope (JWST) exploits the nearby cluster Abell 2744 to create the deepest view of our universe to date by leveraging strong gravitational lensing. In this work, we perform photometric fitting of more than 50,000 robustly detected sources out to $z \sim 15$. We show the redshift evolution of stellar ages, star formation rates, and rest-frame colors across the full range of $0.2 \lesssim z \lesssim 15$. The galaxy properties are inferred using the Prospector Bayesian inference framework using informative Prospector-$β$ priors on masses and star formation histories to produce joint redshift and stellar population posteriors, and additionally lensing magnification is performed on-the-fly to ensure consistency with the scale-dependent priors. We show that this approach produces excellent photometric redshifts with $σ_{\rm NMAD} \sim 0.03$, of a similar quality to the established photometric redshift code EAzY. In line with the open-source scientific objective of the Treasury survey, we publicly release the stellar population catalog with this paper, derived from the photometric catalog adapting aperture sizes based on source profiles. This release includes posterior moments, maximum-likelihood spectra, star-formation histories, and full posterior distributions, offering a rich data set to explore the processes governing galaxy formation and evolution over a parameter space now accessible by JWST.

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。

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