利用 ACT 和 DES 探测大质量星系团中的星系演化：作为宇宙时钟的溅回边界
星系天体物理
2021-12-15 v1
摘要
我们利用暗能量巡天（DES）观测的星系，测量了 Advanced Atacama Cosmology Telescope (AdvACT) 巡天中通过 Sunyaev--Zeldovich (SZ) 效应选取的星系团的星系投影数密度剖面和溅回特征。完整星系样本的溅回半径与仅 CDM 模拟的理论测量结果一致，位于 Mpc 处。我们根据星系颜色对样本进行划分，发现剖面形状存在显著差异。红色星系和绿谷中的星系在其斜率剖面中表现出与理论预测一致的类溅回极小值，而最蓝的星系则表现出出现在较小半径处的微弱特征。我们通过根据落入星系团晕的时间对子晕进行划分，开发了 体模拟中星系到子晕的映射。我们发现，最陡斜率的位置和剖面形状的差异可以映射到不同颜色星系平均落入时间的差异。星系剖面中斜率的极小值追踪了暗物质晕相空间中的不连续性。通过将不同颜色星系的空间剖面与落入时间相关联，我们可以将溅回作为时钟来理解星系猝灭。我们发现，红色星系平均在星系团中停留时间超过 ，绿色星系约 ，而蓝色星系是最近才被吸积的，尚未到达远心点。利用完整径向剖面的信息，我们拟合了一个简单的猝灭模型，发现星系团中星系猝灭的开始发生在约十亿年的延迟之后，此后星系以 0.6 Gyr 的指数时间尺度迅速猝灭。
引用
@article{arxiv.2008.11663,
title = {Probing galaxy evolution in massive clusters using ACT and DES: splashback as a cosmic clock},
author = {Susmita Adhikari and Tae-hyeon Shin and Bhuvnesh Jain and Matt Hilton and Eric Baxter and Chihway Chang and Risa H. Wechsler and Nick Battaglia and J. Richard Bond and Sebastian Bocquet and Joseph DeRose and Steve K. Choi and Mark Devlin and Jo Dunkley and August E. Evrard and Simone Ferraro and J. Colin Hill and John P. Hughes and Patricio A. Gallardo and Martine Lokken and Amanda MacInnis and Jeffrey McMahon and Mathew S. Madhavacheril and Frederico Nati and Laura B. Newburgh and Michael D. Niemack and Lyman A. Page and Antonella Palmese and Bruce Partridge and Eduardo Rozo and Eli Rykoff and Maria Salatino and Alessandro Schillaci and Neelima Sehgal and Cristóbal Sifón and Chun-Hao To and Ed Wollack and Hao-Yi Wu and Zhilei Xu and Michel Aguena and Sahar Allam and Alexandra Amon and James Annis and Santiago Avila and David Bacon and Emmanuel Bertin and Sunayana Bhargava and David Brooks and David L. Burke and Aurelio C. Rosell and Matias Carrasco Kind and Jorge Carretero and Francisco Javier Castander and Ami Choi and Matteo Costanzi and Luiz N. da Costa and Juan De Vicente and Shantanu Desai and Thomas H. Diehl and Peter Doel and Spencer Everett and Ismael Ferrero and Agnès Ferté and Brenna Flaugher and Pablo Fosalba and Josh Frieman and Juan García-Bellido and Enrique Gaztanaga and Daniel Gruen and Robert A. Gruendl and Julia Gschwend and Gaston Gutierrez and Will G. Hartley and Samuel R. Hinton and Devon L. Hollowood and Klaus Honscheid and David J. James and Tesla Jeltema and Kyler Kuehn and Nikolay Kuropatkin and Ofer Lahav and Marcos Lima and Marcio A. G. Maia and Jennifer L. Marshall and Paul Martini and Peter Melchior and Felipe Menanteau and Ramon Miquel and Robert Morgan and Ricardo L. C. Ogando and Francisco Paz-Chinchón and Andrés Plazas Malagón and Eusebio Sanchez and Basilio Santiago and Vic Scarpine and Santiago Serrano and Ignacio Sevilla-Noarbe and Mathew Smith and Marcelle Soares-Santos and Eric Suchyta and Molly E. C. Swanson and Tamas N. Varga and Reese D. Wilkinson and Yuanyuan Zhang and Jason E. Austermann and James A. Beall and Daniel T. Becker and Edward V. Denison and Shannon M. Duff and Gene C. Hilton and Johannes Hubmayr and Joel N. Ullom and Jeff Van Lanen and Leila R. Vale and DES Collaboration and ACT Collaboration},
journal= {arXiv preprint arXiv:2008.11663},
year = {2021}
}
备注
23 pages, 10 figures, to be submitted to ApJ