COS遗产光谱巡天(CLASSY)库图集
星系天体物理
2022-08-03 v1
摘要
远紫外(FUV; ~1200-2000埃)光谱是我们理解恒星形成星系的基础，为大质量恒星族、化学演化、反馈过程与再电离提供了独特窗口。JWST的发射即将开启新时代，将UV光谱前沿推至比以往更高的红移，然而其成功依赖于对驱动所观测UV光谱特征的大质量恒星族与气体条件的全面理解。这所需的细节程度，唯有通过任何FUV光谱数据库尚未实现的充足波长覆盖、信噪比、光谱分辨率与样本多样性的结合才可能达到。我们呈现COS遗产光谱巡天(CLASSY)库及其首个高层科学产品——CLASSY图集。CLASSY基于HST档案构建首个由45个邻近(0.002 < z < 0.182)恒星形成星系组成的高质量(S/N_1500 >~ 5/resel)、高分辨率(R~15,000) FUV光谱数据库。CLASSY图集通过CLASSY网站向公众开放，是优化提取并合并来自312轨HST观测的170个档案+新光谱的结果。CLASSY样本覆盖广泛性质，包括恒星质量(6.2 < logM_star(M_sol) < 10.1)、恒星形成率(-2.0 < log SFR (M_sol/yr) < +1.6)、直接气相金属丰度(7.0 < 12+log(O/H) < 8.8)、电离度(0.5 < O_32 < 38.0)、红化(0.02 < E(B-V) < 0.67)与星云密度(10 < n_e (cm^-3) < 1120)。CLASSY偏向UV亮恒星形成星系，导致样本与z~0质量-金属丰度关系一致，但SFR高出约2 dex，类似于z >~2星系。这组独特性质使CLASSY图集成为跨宇宙时标的恒星形成星系基准训练集。
引用
@article{arxiv.2203.07357,
title = {The COS Legacy Archive Spectroscopy SurveY (CLASSY) Treasury Atlas},
author = {Danielle A. Berg and Bethan L. James and Teagan King and Meaghan Mcdonald and Zuyi Chen and John Chisholm and Timothy Heckman and Crystal L. Martin and Dan P. Stark and The Classy Team and : and Alessandra Aloisi and Ricardo O. AmorÍn and Karla Z. Arellano-CÓrdova and Matthew Bayliss and Rongmon Bordoloi and Jarle Brinchmann and StÉphane Charlot and Jacopo Chevallard and Ilyse Clark and Dawn K. Erb and Anna Feltre and Matthew Hayes and Alaina Henry and Svea Hernandez and Anne Jaskot and Tucker Jones and Lisa J. Kewley and Nimisha Kumari and Claus Leitherer and Mario Llerena and Michael Maseda and Matilde Mingozzi and Themiya Nanayakkara and Masami Ouchi and Adele Plat and Richard W. Pogge and Swara Ravindranath and Jane R. Rigby and Ryan Sanders and Claudia Scarlata and Peter Senchyna and Evan D. Skillman and Charles C. Steidel and Allison L. Strom and Yuma Sugahara and Stephen M. Wilkins and Aida Wofford and Xinfeng Xu},
journal= {arXiv preprint arXiv:2203.07357},
year = {2022}
}
备注
Accepted for publication in ApJ