Upgrading the field-imaging far-infrared line spectrometer for the Stratospheric Observatory for Infrared Astronomy (SOFIA) with KIDs: enabling large sample (extragalactic) surveys

S. Colditz, L. Looney, F. Bigiel, C. Fischer, J. Fischer, S. Hailey-Dunsheath, R. Herrera-Camus, A. Krabbe, H. Leduc, T. Wong, J. Zmuidzinas
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引用次数: 1

Abstract

We present the initial design, performance improvements and science opportunities for an upgrade to the Field-Imaging Far-Infrared Line Spectrometer (FIFI-LS). FIFI-LS efficiently measures fine structure cooling lines, delivering critical constraints of the interstellar medium and starforming environments. SOFIA provides the only FIR observational capability in the world, making FIFI-LS a workhorse for FIR lines, combining optimal spectral resolution and a wide velocity range. Its continuous coverage from 51-203 microns makes FIFI-LS a versatile tool to investigate a multitude of diagnostic lines within our galaxy and in extragalactic environments. The sensitivity and field-of-view (FOV) of FIFI-LS are limited by its 90s-era photoconductor arrays. These limits can be overcome by upgrading the instrument using the latest developments in Kinetic Inductance Detectors (KIDs). KIDs provide sensitivity gains in excess of 1.4 and allow larger arrays, enabling an increase in pixel count by an order of magnitude. This increase allows a wider FOV and instantaneous velocity coverage. The upgrade provides gains in point source observation speed by a factor <2 and in mapping speed by a factor <3.5, enabled by the improved sensitivity and pixel count. This upgrade has been proposed to NASA in response to the 2018 SOFIA Next Generation Instrumentation call.
用KIDs升级平流层红外天文观测站(SOFIA)的远红外线谱仪:实现大样本(河外)调查
本文介绍了场成像远红外谱仪(FIFI-LS)的初步设计、性能改进和科学升级的机会。FIFI-LS有效地测量精细结构冷却线,提供星际介质和恒星形成环境的关键约束。SOFIA提供了世界上唯一的FIR观测能力,使FIFI-LS成为FIR线路的主力,结合了最佳的光谱分辨率和宽的速度范围。它的连续覆盖范围从51-203微米,使FIFI-LS成为一个多功能的工具,可以在我们的银河系和银河系外的环境中研究大量的诊断线。FIFI-LS的灵敏度和视场(FOV)受到90年代光导体阵列的限制。这些限制可以通过使用动态电感检测器(KIDs)的最新发展升级仪器来克服。KIDs提供超过1.4的灵敏度增益,并允许更大的阵列,使像素数增加一个数量级。这种增加允许更宽的FOV和瞬时速度覆盖。升级后的点源观测速度提高了2倍,映射速度提高了3.5倍,这得益于灵敏度和像素数量的提高。此次升级是为了响应2018年SOFIA下一代仪器的需求而向NASA提出的。
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