Euclid：利用观测颜色选取宁静与恒星形成星系
星系天体物理
2020-04-15 v1
摘要
Euclid任务将观测远超十亿个星系直至 z\sim6 及更远。这将为研究星系形成与演化中的若干关键问题提供无与伦比的机会。许多此类研究的第一步将是选取宁静与恒星形成星系样本，正如文献中常通过使用如“UVJ”图等知名颜色技术所做的那样。然而，鉴于Euclid望远镜可用的滤光片数量有限，恢复此类静止系颜色将具有挑战性。因此我们研究利用Euclid观测颜色，单独及与地面u波段观测结合，来选取宁静与恒星形成星系。在本文测试的组合中，最高效的颜色组合由 (u-VIS) 与 (VIS-J) 颜色构成。我们发现该组合使用户能在 0.75<z<1 红移范围内选取完备度高于约70%且污染低于15%的宁静星系样本。对于高红移星系或无u波段补充观测的星系，(VIS-Y) 与 (J-H) 颜色代表一种有效替代，在 1<z<2 范围内寻找宁静星系时完备度水平 >65% 且污染低于20%。相比之下，当利用模拟Euclid观测恢复静止系颜色时，用传统UVJ技术选取的宁静星系样本在 z<3 处完备度仅约20%。这表明当仅有Euclid波段及u波段成像可用时，我们的新方法是首选。
引用
@article{arxiv.2003.07367,
title = {Euclid: The selection of quiescent and star-forming galaxies using observed colours},
author = {L. Bisigello and U. Kuchner and C. J. Conselice and S. Andreon and M. Bolzonella and P. -A. Duc and B. Garilli and A. Humphrey and C. Maraston and M. Moresco and L. Pozzetti and C. Tortora and G. Zamorani and N. Auricchio and J. Brinchmann and V. Capobianco and J. Carretero and F. J. Castander and M. Castellano and S. Cavuoti and A. Cimatti and R. Cledassou and G. Congedo and L. Conversi and L. Corcione and M. S. Cropper and S. Dusini and M. Frailis and E. Franceschi and P. Franzetti and M. Fumana and F. Hormuth and H. Israel and K. Jahnke and S. Kermiche and T. Kitching and R. Kohley and B. Kubik and M. Kunz and O. Le Fèvre and S. Ligori and P. B. Lilje and I. Lloro and E. Maiorano and O. Marggraf and R. Massey and D. C. Masters and S. Mei and Y. Mellier and G. Meylan and C. Padilla and S. Paltani and F. Pasian and V. Pettorino and S. Pires and G. Polenta and M. Poncet and F. Raison and J. Rhodes and M. Roncarelli and E. Rossetti and R. Saglia and M. Sauvage and P. Schneider and A. Secroun and S. Serrano and F. Sureau and A. N. Taylor and I. Tereno and R. Toledo-Moreo and L. Valenziano and Y. Wang and M. Wetzstein and J. Zoubian},
journal= {arXiv preprint arXiv:2003.07367},
year = {2020}
}
备注
19 pages, 15 figures, 5 tables, accepted for publication in MNRAS