Evaluation of payload performance for a sounding rocket vacuum ultraviolet spatial heterodyne spectrometer to observe C IV λλ1550 emissions from the Cygnus Loop

Steven Watchorn; Fred L. Roesler; John Harlander; Kurt P. Jaehnig; Ronald J. Reynolds; Wilton T. Sanders

doi:10.1364/AO.49.003265

Applied Optics
Vol. 49,
Issue 17,
pp. 3265-3273
(2010)
•https://doi.org/10.1364/AO.49.003265

Evaluation of payload performance for a sounding rocket vacuum ultraviolet spatial heterodyne spectrometer to observe C IV $λ λ 1550$ emissions from the Cygnus Loop

Steven Watchorn, Fred L. Roesler, John Harlander, Kurt P. Jaehnig, Ronald J. Reynolds, and Wilton T. Sanders

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Steven Watchorn, Fred L. Roesler, John Harlander, Kurt P. Jaehnig, Ronald J. Reynolds, and Wilton T. Sanders, "Evaluation of payload performance for a sounding rocket vacuum ultraviolet spatial heterodyne spectrometer to observe C IV λλ1550 emissions from the Cygnus Loop," Appl. Opt. 49, 3265-3273 (2010)

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Abstract

The results of a project to develop a spatial heterodyne spectrometer (SHS) for a sounding rocket mission to study the Cygnus Loop, a prototypical middle-aged supernova remnant, are discussed. The goal was to obtain a radial velocity-resolved spectrum of the C IV $λλ 1550$ emission line from bright features of the Cygnus Loop, as a test for mapping the diffuse hot interstellar medium (ISM). A full Fourier-transform analysis of Cygnus Loop emission data is presented, showing lack of velocity-resolved C IV emission detection. Optics contamination is shown to be the most likely problem, and ways to eliminate this contamination for future SHS sounding rocket and satellite missions are discussed.

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Resolving Power	15,000
Resolution Limit at $1550 Å$	$0.1 Å$
Field of View (instrument)	$15 ° \times 15 °$
Field of View (target)	$2.25 ° \times 2.25 °$
Spectral Range (nominal)	$\pm 12 Å$
Bandpass (filter)	$70 Å$

Component(s)	Preflight Efficiency	Postflight Efficiency	Factor Down
Full Payload	$1.9 \times 10^{- 3}$	$1.3 \times 10^{- 4}$	14.6
SHS	0.0137	0.0058	2.36
BS/CP	0.057	0.034	1.67
Toric Lens	0.524	0.523	1.01
Filter Mirrors (peak)	0.730	0.310	2.35
Detector Section	0.462	0.168	2.75
Detector Lens #2	0.800	0.800	1.00

Resolving Power	15,000
Resolution Limit at $1550 Å$	$0.1 Å$
Field of View (instrument)	$15 ° \times 15 °$
Field of View (target)	$2.25 ° \times 2.25 °$
Spectral Range (nominal)	$\pm 12 Å$
Bandpass (filter)	$70 Å$

Component(s)	Preflight Efficiency	Postflight Efficiency	Factor Down
Full Payload	$1.9 \times 10^{- 3}$	$1.3 \times 10^{- 4}$	14.6
SHS	0.0137	0.0058	2.36
BS/CP	0.057	0.034	1.67
Toric Lens	0.524	0.523	1.01
Filter Mirrors (peak)	0.730	0.310	2.35
Detector Section	0.462	0.168	2.75
Detector Lens #2	0.800	0.800	1.00

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Applied Optics