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• W3102760808 endingPage "467" @default.
• W3102760808 startingPage "378" @default.
• W3102760808 abstract "We analyze intergalactic H i and O vi absorbers with v < 5000 km s−1 in Hubble Space Telescope and Far Ultraviolet Spectroscopic Explorer spectra of 76 active galactic nuclei. The baryons traced by H i/O vi absorption are clearly associated with the extended surroundings of galaxies; for impact parameters <400 kpc they are 2–4 times more numerous as those inside the galaxies. This large reservoir of matter likely plays a major role in galaxy evolution. We tabulate the fraction of absorbers having a galaxy of a given luminosity within a given impact parameter (ρ) and velocity difference (Δv), as well as the fraction of galaxies with an absorber closer than a given ρ and Δv. We identify possible void absorbers (ρ > 3 Mpc to the nearest L* galaxy), although at v < 2500 km s−1 all absorbers are within 1.5 Mpc of an L>0.1 L* galaxy. The absorber properties depend on ρ, but the relations are not simple correlations. For four absorbers with ρ = 50–350 kpc from an edge-on galaxy with known orientation of its rotation, we find no clear relation between absorber velocities and the rotation curve of the underlying galaxy. For ρ < 350 kpc, the covering factor of Lyα (O vi) around L>0.1 L* galaxies is 100% (70%) for field galaxies and 65% (10%) for group galaxies; 50% of galaxy groups have associated Lyα. All O vi absorbers occur within 550 kpc of an L>0.25 L* galaxy. The properties of three of 14 O vi absorbers are consistent with photoionization, for five the evidence points to collisional ionization; the others are ambiguous. The fraction of broad Lyα lines increases from z = 3 to z = 0 and with decreasing impact parameter, consistent with the idea that gas inside ∼500 kpc from galaxies is heating up, although alternative explanations cannot be clearly excluded." @default.
• W3102760808 created "2020-11-23" @default.
• W3102760808 creator A5021977014 @default.
• W3102760808 creator A5036808277 @default.
• W3102760808 date "2009-05-01" @default.
• W3102760808 modified "2023-10-10" @default.
• W3102760808 title "THE RELATIONSHIP BETWEEN INTERGALACTIC H I/O VI AND NEARBY ( <i>z</i> < 0.017) GALAXIES" @default.
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