title: Imaging spectrograph for interstellar shocks: a narrowband imaging payload for the far ultraviolet.
abstract: We present an imaging spectrometer developed for narrowband imaging at 1035 A with high (approximately 1-arc sec) spatial resolution over a modest field of view (approximately 5 arc min). The instrument is based on a conventional Gregorian telescope with aberration-corrected holographic rulings on the secondary optic. These aberration-correcting rulings enable stigmatic imaging in diffracted light with a minimum number of optical elements, thereby maintaining a high system efficiency. The capabilities of this instrument allow us to map the distribution of UV-emitting material in the hot (approximately 300,000 K) plasma from shocks in supernova remnants. Although this design is optimized for imaging near 1035 A, the basic concept can be applied to provide narrowband imaging or long-slit imaging spectroscopy at any wavelength. In addition, a larger field of view is possible with a corresponding loss in spatial resolution.
authors.affiliation: Center for Astrophysics and Space Astronomy, University of California, Boulder, Colorado 80309, USA. beasley@casa.colorado.edu
authors.forename: Matthew
authors.initials: M
authors.lastname: Beasley
authors.forename: Catherine
authors.initials: C
authors.lastname: Boone
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Cunningham
authors.forename: James
authors.initials: J
authors.lastname: Green
authors.forename: Erik
authors.initials: E
authors.lastname: Wilkinson