The prime focus imaging spectrograph for the Southern African large telescope: Operational modes.

被引:208
|
作者
Kobulnicky, HA [1 ]
Nordsieck, KH [1 ]
Burgh, EB [1 ]
Smith, MP [1 ]
Percival, JW [1 ]
Williams, TB [1 ]
O'Donoghue, D [1 ]
机构
[1] Univ Wisconsin, Space Astron Lab, Madison, WI 53706 USA
来源
INSTRUMENT DESIGN AND PERFORMANCE FOR OPTICAL/INFRARED GROUND-BASED TELESCOPES, PTS 1-3 | 2003年 / 4841卷
关键词
astronomical spectrographs; optical design; near-ultraviolet spectroscopy; volume phase holographic gratings; Fabry-Perot interferometry; spectropolarimetry;
D O I
10.1117/12.460315
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The Prime Focus Imaging Spectrograph (PFIS) will be the workhorse first-generation spectrograph on the Southern African Large Telescope (SALT). Scheduled for commissioning in late 2004, PFIS is a versatile high-throughput imaging spectrograph with a complement of 5 volume-phase holographic gratings for spectroscopic programs from 3200 Angstrom to 9000 Angstrom at resolutions of R=1500 to R=10000. A magazine of 6 longslits and 30 custom laser-milled slitmasks enables single- or multi-object spectroscopy over an 8 arc minute diameter field. With the gratings stowed, a dual-etalon Fabry-Perot subsystem enables imaging spectroscopy at R=500, R=3000, and R=12,500. The polarization subsystem, consisting of a polarizing beam-splitter used in conjunction with half- and quarter-wave plates, allows linear or circular polarimetric measurements in ANY of the spectroscopic modes. Three mosaiced rapid-readout frame-transfer CCDs provide the capability for time-resolved sampling at rates in excess of 10 Hz. Combinations of these subsystems permit novel observing modes for specialized scientific programs. Examples include high time-resolution multi-object spectral polarimetry of accreting compact objects, and Fabry-Perot polarimetry or imaging spectral polarimetry of nebulae and stellar clusters. The demands of queue-scheduled observing on a fixed-altitude telescope require that the instrument be capable of rapid reconfiguration between modes.
引用
收藏
页码:1634 / 1644
页数:11
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