DSA/Chronoscope快速射电暴巡天：预测与科学概述
The DSA/Chronoscope fast radio burst survey: forecasts and science overview
- Harvard & Smithsonian（哈佛大学与史密森尼学会）
- California Institute of Technology（加州理工学院）
- The Observatories of the Carnegie Institution for Science（卡内基科学机构天文台）
- Cornell University（康奈尔大学）
- Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）
- University of Arizona（亚利桑那大学）
- Northwestern University（西北大学）
- University of California, Berkeley（加州大学伯克利分校）
- Massachusetts Institute of Technology（麻省理工学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究介绍DSA/Chronoscope快速射电暴巡天的参数，预测其5年可探测约10^5个FRB，将用于探测宇宙重子、研究FRB起源及宇宙学相关问题。
AI中文摘要：
快速射电暴（FRBs）是明亮的河外暂现源，其起源仍存在诸多谜团。大样本FRB能实现对宇宙物质分布的精确测量，尤其是在小于等于10兆秒差距（Mpc）的尺度上。这些测量将影响宇宙学推断以及我们对天体物理反馈的理解，反馈范围从星系际介质到星系团尺度。本文中，我们预测了由深视场阵列（DSA）观测到的FRB的预期数量、红移和宿主星系，并描述了大样本FRB所支持的关键科学案例。DSA将是一个由1650个6.15米天线组成的干涉仪，工作在0.7至2吉赫兹（GHz）频段，位于美国内华达州。DSA上的Chronoscope后端（以下简称DSA/Chronoscope）旨在实时搜索视场内的FRB，支持存储全极化电压数据。基于现有FRB巡天进行外推，假设源计数满足欧几里得分布且基线计算后端能以1毫秒采样率搜索6×10^6个波束，我们预计在三个搜索子带中每年约有10^4次FRB探测，跨子带组合后，在DSA标称5年巡天期间可产生约10^5个FRB。特征明确的DSA合成波束和深度同步参考图像将实现小于等于250毫角秒的定位精度。关键科学案例包括利用FRB传播效应探测宇宙重子、通过FRB宿主星系及其局部环境研究FRB现象，以及多波段对应体研究。
英文摘要：
Fast radio bursts (FRBs) are bright extragalactic transients with several mysteries surrounding their origins. Large FRB samples enable accurate measurements of the cosmic matter distribution, in particular on scales $\lesssim 10$ Mpc. These measurements will impact cosmological inference and our understanding of astrophysical feedback, from the circumgalactic medium to cluster scales. Here we forecast the expected yields, redshifts, and host galaxies of FRBs as observed by the Deep Synoptic Array (DSA), and describe the key science cases enabled by the large FRB sample. The DSA will be an interferometer consisting of 1650$\times$6.15 m antennas, operating between 0.7--2 GHz, to be located in Nevada, USA. The Chronoscope backend on the DSA, hereafter DSA/Chronoscope, is designed to search for FRBs across the field of view in real time, enabling the storage of full-polarization voltage data. Extrapolating from existing FRB surveys, we expect roughly $10^4$ FRB detections per year in each of three search sub-bands. Combining across sub-bands, the survey could produce $\sim$ 10$^5$ FRBs over the nominal 5-year DSA survey, assuming Euclidean source counts and a baseline compute backend that can search $6\times10^6$ beams at 1 ms sampling. The well-characterized DSA synthesized beam and deep simultaneous reference images will enable localization precisions of $\lesssim$ 250 milliarcseconds. Key science cases include the use of FRB propagation effects in probing cosmic baryons, and studies of the FRB phenomenon using FRB host galaxies and their local environment, as well as multiwavelength counterparts.
