暗能量巡天中发现的恒星流
星系天体物理
2018-08-08 v1 宇宙学与河外天体物理
摘要
我们利用暗能量巡天（DES）前三年的多波段光学成像数据，在银河系周围搜寻恒星流。我们使用 DES 覆盖 平方度、深度达 、相对测光定标不确定度 的数据。该数据集对南天恒星密度场具有前所未有的灵敏度，可探测到日心距离约 kpc 的暗弱恒星流。我们采用由古老、贫金属恒星族的合成等龄线导出的颜色–星等空间匹配滤波器搜寻恒星流。我们的探测技术恢复了四条已知薄恒星流：Phoenix、ATLAS、Tucana III，以及 Molonglo 的可能延展。此外，我们报告了十一条新恒星流的发现。总体而言，DES 探测到的新流比先前测光巡天中用类似技术探测的流更暗、更远且面亮度更低。作为恒星流搜寻的副产物，我们发现与四个球状星团 NGC 288、NGC 1261、NGC 1851 和 NGC 1904 相关的潮汐外恒星结构证据。不断增长的恒星流样本将深化对银河系恒星晕形成、银河系引力势以及银河系周围暗物质大尺度和小尺度分布的理解。
引用
@article{arxiv.1801.03097,
title = {Stellar Streams Discovered in the Dark Energy Survey},
author = {N. Shipp and A. Drlica-Wagner and E. Balbinot and P. Ferguson and D. Erkal and T. S. Li and K. Bechtol and V. Belokurov and B. Buncher and D. Carollo and M. Carrasco Kind and K. Kuehn and J. L. Marshall and A. B. Pace and E. S. Rykoff and I. Sevilla-Noarbe and E. Sheldon and L. Strigari and A. K. Vivas and B. Yanny and A. Zenteno and T. M. C. Abbott and F. B. Abdalla and S. Allam and S. Avila and E. Bertin and D. Brooks and D. L. Burke and J. Carretero and F. J. Castander and R. Cawthon and M. Crocce 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 H. T. Diehl and P. Doel and A. E. Evrard and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and E. Gaztanaga and D. W. Gerdes and D. Gruen and R. A. Gruendl and J. Gschwend and G. Gutierrez and B. Hoyle and D. J. James and M. D. Johnson and E. Krause and N. Kuropatkin and O. Lahav and H. Lin and M. A. G. Maia and M. March and P. Martini and F. Menanteau and C. J. Miller and R. Miquel and R. C. Nichol and A. A. Plazas and A. K. Romer and M. Sako and E. Sanchez and V. Scarpine and R. Schindler and M. Schubnell and M. Smith and R. C. Smith and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and D. L. Tucker and A. R. Walker and R. H. Wechsler and the DES Collaboration},
journal= {arXiv preprint arXiv:1801.03097},
year = {2018}
}
备注
32 pages, 6 animations, 19 figures, 4 tables; submitted to ApJ