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2002A&A...396L..11B - Astronomy and Astrophysics, volume 396, L11-15 (2002/12-3)

The warm-hot intergalactic medium at z∼2.2: Metal enrichment and ionization source.


Abstract (from CDS):

Result. are presented for our search for warm-hot gas towards the quasar Q 0329-385. We identify ten Ovi systems of which two are within 5000 km/s of zem and a third one should be of intrinsic origin. The seven remaining systems have Hi column densities 1013.7≤N(HI)≤1015.6cm–2. At least ∼1/3 of the individual Ovi sub-systems have temperatures T<1x105K and cannot originate in collisionally ionized gas. Photoionization by a hard UV background field reproduces well the ionic ratios for metallicities in the range 10–2.5-10–0.5 solar, with possibly sub-solar N/C relative abundance. For [O/C]=0, the sizes inferred for the Ovi clouds are in some cases larger than the maximum extent implied by the Hubble flow. This constraint is fulfilled assuming a moderate overabundance of oxygen relative to carbon. For a soft UV ionizing spectrum, an overabundance of O/C is required, [O/C]≃0.0-1.3. For a hard(soft) U spectrum and [O/C]=0(1), the Ovi regions have overdensities ρ/<ρ≥∼10-40.

Abstract Copyright:

Journal keyword(s): cosmology: observations - intergalactic medium - galaxies: halos - quasars: absorption lines

Nomenclature: Table 1: [BAP2002] QSO J0331-3824 abs N.NNNN N=10. Table 2: [BAP2002] QSO J0331-3824 abs N.NNNNN N=5.

Simbad objects: 1

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