Properties of the Highly Ionized High-Velocity Absorption Systems in the UV Spectra of four AGNs

Details Properties of the Highly Ionized High-Velocity Absorption Systems in the UV Spectra of four AGNs Properties of the Highly Ionized High-Velocity Absorption Systems in the UV Spectra of four AGNs

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.4104f&link_type=abstract

American Astronomical Society Meeting 203, #41.04; Bulletin of the American Astronomical Society, Vol. 35, p.1270

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a detailed ultraviolet absorption line study of four high-positive-velocity, highly ionized systems toward the active galaxies HE 0226-4110, Mrk 509, PG 0953+414, and PKS 0405-12. Using Far-Ultraviolet Spectroscopic Explorer (FUSE) and Hubble Space Telescope Imaging Spectrograph (HST/STIS) observations, we explore the kinematics and physical conditions in the highly ionized absorbers with velocities ranging from 100 to 300 km s-1, in an attempt to understand their origins. The inter-relationships between the properties of absorption in different ionic species (e.g. H I, C III, C IV, Si III, Si IV, and O VI) reveal a wealth of information about the absorbing gas. It has been claimed that the high-velocity O VI detections trace gas in the Local Group, possibly as part of a warm-hot extragalactic filament. We consider whether the high-velocity O VI in our sight lines is distant extragalactic material, or might instead be tracing either a fountain outflow or matter that has been tidally stripped from nearby dwarf galaxies. We appreciate financial support from NASA contract NAS5-32985.

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