Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7718w&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.18; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of a survey of 73 extragalactic sightlines observed by FUSE and/or HST, which pass within 1 Mpc of a nearby galaxy (v(Gal)=400 to 5000 km/s). Most of these galaxies are found in the RC3, with additional ones coming from NED. We then search for Lya, Lyb and OVI absorption at a velocity within about 200 km/s of that of the galaxy, noting detections and non-detections. We find 282 coincidences that allow a search for Lya and/or Lyb, 251 for OVI. For Lya/Lyb and OVI the detection rate decreases regularly with impact parameter, b. We find HI in 86% (6 of 7) coincidences with b<100 kpc, 60% (27 of 52) for b=100-300 kpc, 44% (35 of 79) for b=300-560 kpc, 17% (25 of 144) for b=560 to 1000 kpc. In addition, we find 28 HI detections without a galaxy within 1 Mpc. OVI is found in 50% (3 of 6) of coincidences with b560 kpc. Assuming that the OVI occurs in collisionally ionized gas with 1/10th solar metallicity, and ionization fraction <20%, the OVI column densities correspond to H columns >1018.5 cm-2. The distribution of impact parameters then implies a mass of 3x105 K gas that is >1011 solar masses per OzVI absorber associated with galaxies.
Savage Blair. D.
Sembach Kenneth Russell
Wakker Bart P.
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