来自暗能量巡天与斯隆数字巡天的候选周期性变亮类星体
高能天体物理现象
2020-11-11 v2 星系天体物理
摘要
周期性变亮类星体被提出作为密近双超大质量黑洞。我们在暗能量巡天超新星（DES-SN）天区与斯隆数字巡天 Stripe 82（SDSS-S82）重叠的 4.6 deg² 区域内，对 625 个光谱确认类星体（中位红移 1.8）系统性地搜寻周期光变曲线。通过结合 DES-SN Y6 观测与档案 SDSS-S82 数据，我们的样本具备独特的 20 年长多色（griz）光变曲线。深场成像使我们首次能够在高红移处搜寻由质量较小黑洞（质量 ≳10^{8.5}M_{⊙}）驱动的较暗弱类星体（暗至 r∼23.5 mag）中的周期光变曲线。我们找到五个具有显著周期性（在至少两个波段中以 >99.74% 单频显著性，全局 p 值约 7×10^{-4}–3×10^{-3} 并计入了看其他地方效应）的候选体，其观测周期为 ∼3–5 年（即静止系中 1–2 年），观测跨度约 4–6 个周期。若五个候选体均为周期性变亮类星体，则对应探测率为 ∼0.8^{+0.5}_{-0.3}% 或 ∼1.1^{+0.7}_{-0.5} 每 deg² 类星体。我们的探测率比较早使用更浅巡天在更大面积上的搜寻高 4–80 倍。该差异可能由所探测类星体族群及巡天数据质量的不同所致。我们讨论了对未来直接探测低频引力波的启示。持续测光监测将进一步评估这些候选周期性类星体的稳健性与特征，以确定其物理起源。
引用
@article{arxiv.2008.12329,
title = {Candidate Periodically Variable Quasars from the Dark Energy Survey and the Sloan Digital Sky Survey},
author = {Yu-Ching Chen and Xin Liu and Wei-Ting Liao and A. Miguel Holgado and Hengxiao Guo and Robert A. Gruendl and Eric Morganson and Yue Shen and Kaiwen Zhang and Tim M. C. Abbott and Michel Aguena and Sahar Allam and Santiago Avila and Emmanuel Bertin and Sunayana Bhargava and David Brooks and David L. Burke and Aurelio Carnero Rosell and Daniela Carollo and Matias Carrasco Kind and Jorge Carretero and Matteo Costanzi and Luiz N. da Costa and Tamara M. Davis and Juan De Vicente and Shantanu Desai and H. Thomas Diehl and Peter Doel and Spencer Everett and Brenna Flaugher and Douglas Friedel and Joshua Frieman and Juan García-Bellido and Enrique Gaztanaga and Karl Glazebrook and Daniel Gruen and Gaston Gutierrez and Samuel R. Hinton and Devon L. Hollowood and David J. James and Alex G. Kim and Kyler Kuehn and Nikolay Kuropatkin and Geraint F. Lewis and Christopher Lidman and Marcos Lima and Marcio A. G. Maia and Marisa March and Jennifer L. Marshall and Felipe Menanteau and Ramon Miquel and Antonella Palmese and Francisco Paz-Chinchón and Andrés A. Plazas and Eusebio Sanchez and Michael Schubnell and Santiago Serrano and Ignacio Sevilla-Noarbe and Mathew Smith and Eric Suchyta and Molly E. C. Swanson and Gregory Tarle and Brad E. Tucker and Tamas Norbert Varga and Alistair R. Walker},
journal= {arXiv preprint arXiv:2008.12329},
year = {2020}
}
备注
21 pages, 8 figures, MNRAS accepted