DES Y1的结构与形态测量目录
星系天体物理
2018-10-03 v2 宇宙学与河外天体物理
摘要
我们呈现了一个从暗能量巡天（DES）首年数据中选取的4500万天体的结构与形态目录。对g、r和i滤光片生成了单Sersic拟合与非参数测量。来自最佳拟合Sersic模型的参数（总星等、半光半径、Sersic指数、轴比和位置角）由Galfit测得；非参数系数（集中度、不对称性、团块性、Gini、M20）由苏黎世结构类型估计器（ZEST+）给出。为研究统计不确定性，我们考虑了一个具有真实输入参数空间分布的最先进图像模拟样本，然后像处理真实数据一样对其进行处理和分析：这使我们能够量化由PSF模糊和星等效应引起的观测偏差，并作为星等、星系尺寸、Sersic指数（非参数分析中的集中度）和椭圆率的函数对测量值进行修正。我们呈现了迄今最大的结构目录：我们发现对所有结构参数的准确且完整的测量通常可对SExtractor MAG AUTO I < 21的星系获得。事实上，i和r滤光片中的参数总体上可良好恢复至MAG AUTO < 21.5，对应于该阈值下约90%的拟合完备度，共计2500万星系。参数与非参数结构测量的结合使该目录成为探索和理解星系如何形成与演化的重要工具。本文描述的目录将随暗能量巡天合作组Y1宇宙学数据产品一同在以下网址公开发布：https://des.ncsa.illinois.edu/releases/y1a1/gold/morphology。
引用
@article{arxiv.1807.10767,
title = {A catalogue of structural and morphological measurements for DES Y1},
author = {F. Tarsitano and W. G. Hartley and A. Amara and A. Bluck and C. Bruderer and M. Carollo and C. Conselice and P. Melchior and B. Moraes and A. Refregier and I. Sevilla-Noarbe and J. Woo and T. M. C. Abbott and S. Allam and J. Annis and S. Avila and M. Banerji and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and C. E. Cunha and C. B. D'Andrea and L. N. da Costa and C. Davis and J. De Vicente and S. Desai and P. Doel and J. Estrada and J. Frieman and J. García-Bellido and D. Gruen and R. A. Gruendl and G. Gutierrez and D. Hollowood and K. Honscheid and D. J. James and T. Jeltema and E. Krause and K. Kuehn and N. Kuropatkin and O. Lahav and M. A. G. Maia and F. Menanteau and R. Miquel and A. A. Plazas and A. K. Romer and A. Roodman and E. Sanchez and B. Santiago and R. Schindler and M. Smith and R. C. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and V. Vikram and A. R. Walker},
journal= {arXiv preprint arXiv:1807.10767},
year = {2018}
}
备注
Accepted for publication in MNRAS. 26 pages, 16 figures. Catalogue data are available at https://des.ncsa.illinois.edu/releases/y1a1/gold/morphology