Studying the Transient Warm/Hot Gas in the Galaxy through FUV Emission from Highly Ionized Species

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The transient warm/hot phase of the diffuse interstellar medium emits two important diagnostic emission lines in the far ultraviolet: CIV 1548,1551 and OVI 1032,1038. We present spectral maps for these emission lines using data from the SPEAR (FIMS) imaging spectrometer, which mapped two-thirds of the sky in the far ultraviolet. For CIV and OVI, we compare our measured emission intensities with previously-published absorption measurements toward background targets to calculate physical properties of this gas and to better understand the distribution of this phase in the Galaxy.
The SPEAR (or FIMS) instrument is supported by NASA grant NAG5-5355, and flies on the STSAT-1 Mission, which is supported by the Korea Ministry of Science and Technology.

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