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| Paper: |
Intergalactic O VI absorption at redshift <0.012 |
| Volume: |
348, Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE |
| Page: |
366 |
| Authors: |
Wakker, B.P.; Savage, B.D.; Sembach, K.R. |
| Abstract: |
FUSE and HST have obtained high-resolution spectra of many extragalactic targets, showing absorption associated with our Galaxy, intergalactic gas clouds, and external galaxies. We describe our study of H I and O VI absorption in sightlines with low impact parameter (<700 kpc) to nearby galaxies (velocities up to 3500 kms−1; z<0.012). This complements studies of more distant O VI absorption, but we can more easily study the galaxies near the sightline (200 kpc at 10 Mpc corresponds to ∼1 degree). In 80% of the cases Lyα or Lyβ absorption (N(H I) up to a few 1014 cm−2) is seen at a velocity within 200 kms−1 of the nearest galaxy's systemic velocity. For impact parameters <350 kpc and a detection limit of 60 mÅ, associated O VI absorption is clearly seen in 5 cases; there are 10 tentative detections (2.5–3Ψ or some blending present) and 7 non-detections. No O VI is found for any pair with impact parameter >350 kpc, with 18 limits <60 mÅ. We find just one case of apparent O VI without a galaxy nearby. |
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