论文标题
BARYON映射实验（BMX），21cm强度映射探路者
The Baryon Mapping Experiment (BMX), a 21cm intensity mapping pathfinder
论文作者
论文摘要
BARYON映射实验（BMX）是一种干涉阵列，旨在作为未来重新电化后21 cm强度映射调查的探路者。它由四个4米抛物线反射器组成，每个反射器具有偏置锥体号角馈电，四方式矫正器传感器，温度稳定的RF扩增和滤波以及脉冲噪声注入二极管。一个底样采样读数方案使用以1.1 Gsamples/sec运行的8位数字化器可访问1.1-1.55 GHz（第三奈奎斯特区）的信号，对应于Redshift $ 0 <z <z <0.3 $的HI发射。 FX相关器在GPU中实现，并生成28 GB/天的时间订购的可见性数据。从2019年1月至2020年5月开始收集约7,000个小时的数据，我们将介绍系统性能的结果，包括灵敏度，光束映射研究，观察明亮的天体目标以及系统电子升级。 BMX是2030年代拟议的PUMA强度映射调查的探路者。
The Baryon Mapping eXperiment (BMX) is an interferometric array designed as a pathfinder for a future post-reionization 21 cm intensity mapping survey. It consists of four 4-meter parabolic reflectors each having offset pyramidal horn feed, quad-ridge orthomode transducer, temperature-stabilized RF amplification and filtering, and pulsed noise injection diode. An undersampling readout scheme uses 8-bit digitizers running at 1.1 Gsamples/sec to provide access to signals from 1.1 - 1.55 GHz (third Nyquist zone), corresponding to HI emission from sources at redshift $0 < z < 0.3$. An FX correlator is implemented in GPU and generates 28 GB/day of time-ordered visibility data. About 7,000 hours of data were collected from Jan. 2019 - May 2020, and we will present results on system performance including sensitivity, beam mapping studies, observations of bright celestial targets, and system electronics upgrades. BMX is a pathfinder for the proposed PUMA intensity mapping survey in the 2030s.
