Galmatheia: A Galactic Plasma Explorer

Details Galmatheia: A Galactic Plasma Explorer Galmatheia: A Galactic Plasma Explorer

1998-10-08

arxiv.org/abs/astro-ph/9810145v1

Astronomy and Astrophysics

Astrophysics

PDF file, 4 pages, including 5 figures. To appear in Ultraviolet - Optical Space Astronomy Beyond HST, ed. J. M. Shull, A. L.

Scientific paper

Galmatheia is a broad bandpass (900-1800 Angstrom), far-ultraviolet (FUV) nebular spectrograph (lambda /delta lambda ~ 650) for the study of the evolution of galactic plasma with a temperature of 10^4.5 - 10^6 K. Galmatheia will survey the FUV sky with 5' imaging and conduct hundreds of deep 8 degree x 5' field pointings during its proposed two-year mission. Unprecedented sensitivity is achieved by careful exclusion of FUV-bright stars and airglow background. The emission-line sensitivity for a single-day exposure and for a one-year sky survey 3 degree x 3 degree bin yields 50 sigma and 10-15 sigma detections, respectively, of both the predicted radiation from hot Galactic gas and previously-observed diffuse FUV emission. The continuum sensitivity provides 15-25 sigma detections of the predicted flux from unresolved extra-galactic sources.

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