GRAVITY faint：利用快速计量衰减系统降低GRAVITY$^+$中的噪声源
天体物理仪器与方法
2022-09-14 v1
摘要
随着从GRAVITY升级到GRAVITY，该仪器将演变为可观测暗弱目标（如高红移AGN）的全天干涉仪。观测最暗弱目标需要尽可能降低GRAVITY中的噪声源。主导噪声源（尤其在光谱蓝端）是计量激光光在探测器上的背向散射。为降低该噪声，我们引入两种新的计量模式。通过较小的硬件改动与软件适配相结合，我们能在不丢失相位参考的情况下于观测期间调暗计量激光。对于单束目标，我们甚至可关闭计量激光以在探测器上获得最大SNR。这些改动使整个光谱平均SNR提升超过2倍，在当前由激光噪声主导的光谱部分提升可达8倍。
引用
@article{arxiv.2209.05593,
title = {GRAVITY faint: reducing noise sources in GRAVITY$^+$ with a fast metrology attenuation system},
author = {F. Widmann and S. Gillessen and T. Ott and T. Shimizu and F. Eisenhauer and M. Fabricius and J. Woillez and F. Gonté and M. Horrobin and J. Shangguan and S. Yazici and G. Perrin and T. Paumard and W. Brandner and L. Kreidberg and C. Straubmeier and K. Perraut and J. -B. Le Bouquin and P. Garcia and S. Hönig and D. Defrère and G. Bourdarot and A. Drescher and H. Feuchtgruber and R. Genzel and M. Hartl and D. Lutz and N. More and C. Rau and S. Uysal and E. Wieprecht},
journal= {arXiv preprint arXiv:2209.05593},
year = {2022}
}
备注
Proceeding of SPIE Astronomical Telescopes + Instrumentation 2022