Probing the WHIM Gas Through Ne VIII Absorption

Details Probing the WHIM Gas Through Ne VIII Absorption Probing the WHIM Gas Through Ne VIII Absorption

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1135...24n&link_type=abstract

FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic

Physics

Quasars, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Auger Effect And Inner-Shell Excitation Or Ionization

Scientific paper

We report on the second ever >=3 σ detection of a Ne VIII intergalactic absorption system. The system is identified in the FUSE spectrum of 3C 263 at a redshift of z = 0.32566. The presence of intermediate ionization species such as O III, O IV, N IV and C IV at the same velocity as Ne VIII, confirms that the absorption system is tracing gas at multiple ionization conditions. Unlike the intermediate ions, we find that the Ne VIII in this absorber is inconsistent with having an origin in a cool photoionization gas phase. The more likely source is collisional ionization in a warm shock-heated phase, in which case the absorber is tracing the WHIM phase of the IGM. Further constraints from H I and O IV are needed to better understand the physical conditions in the warm collisionally ionized gas. The properties of this absorber bear resemblance to the previous detection of Ne VIII reported by Savage et al. (2005).

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