Far-UV Observations of a Thermal Interface in the Orion-Eridanus Superbubble

Abstract

Diffuse far-UV emission arising from the edge of the Orion-Eridanus superbubble was observed with the SPEAR imaging spectrometer, revealing numerous emission lines arising from both atomic species and H2. Spatial variations in line intensities of CIV, SiII, and OVI, in comparison with soft X-ray, H-alpha and dust data, indicate that these ions are associated with processes at the interface between hot gas inside the bubble and the cooler ambient medium. Thus our observations probe physical conditions of an evolved thermal interface in the ISM.

4 pages, 4 figures Accepted to ApJLetters

References in corpus (6)

• The SPEAR Instrument and On-Orbit Performance
• The Spectroscopy of Plasma Evolution from Astrophysical Radiation Mission
• SPEAR Far Ultraviolet Spectral Images of the Cygnus Loop
• Far Ultraviolet Spectral Images of the Vela Supernova Remnant
• Molecular Hydrogen Fluorescence in the Eridanus Superbubble
• Far-ultraviolet Observations of the North Ecliptic Pole with SPEAR

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• SPEAR far UV spectral imaging of highly ionized emission from the North Galactic Pole Region
• Far-Ultraviolet Cooling Features of the Antlia Supernova Remnant
• Global distribution of far-ultraviolet emissions from highly ionized gas in the Milky Way
• A photo-ionized canopy for the shock-excited Criss-Cross Nebula
• Space Missions for Astronomy and Astrophysics in Korea: Past, Present, and Future