Far-ultraviolet Observations of the North Ecliptic Pole with SPEAR

Abstract

We present SPEAR/FIMS far-ultraviolet observations near the North Ecliptic Pole. This area, at b~30 degrees and with intermediate HI column, seems to be a fairly typical line of sight that is representative of general processes in the diffuse ISM. We detect a surprising number of emission lines of many elements at various ionization states representing gas phases from the warm neutral medium (WNM) to the hot ionized medium (HIM). We also detect fluorescence bands of H2, which may be due to the ubiquitous diffuse H2 previously observed in absorption.

5 pages, 3 figures, Accepted for publication in ApJ Letters

References in corpus (2)

• The SPEAR Instrument and On-Orbit Performance
• The Spectroscopy of Plasma Evolution from Astrophysical Radiation Mission

Cited by in corpus (5)

• The Spectroscopy of Plasma Evolution from Astrophysical Radiation Mission
• An Extended FUSE Survey of Diffuse O VI Emission in the Interstellar Medium
• Far-UV Observations of a Thermal Interface in the Orion-Eridanus Superbubble
• SPEAR far UV spectral imaging of highly ionized emission from the North Galactic Pole Region
• Far-Ultraviolet Cooling Features of the Antlia Supernova Remnant