Interstellar hot plasma contributions to the diffuse ultraviolet background

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Background Radiation, Cosmic Plasma, Diffuse Radiation, Far Ultraviolet Radiation, Galactic Radiation, High Temperature Plasmas, Interstellar Gas, Emission Spectra, Line Spectra, Radiative Transfer

Scientific paper

The intensity of the diffuse background emission in the far ultraviolet from hot coronal gas present in the plane and halo of the galaxy is calculated. The main emission lines expected are those of C III, IV, N III, IV and Si III, IV at 1909, 1549, 1749, 1487, 1207 and 1398 A respectively. Unless the gas is unusually clumped or has extremely depleted abundances, this source is not of sufficient intensity to influence current broadband measurements of the diffuse continuous ultraviolet background. However, future observations at higher sensitivity and resolution might have to take this effect into account.

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