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1998AJ....116.2094S - Astron. J., 116, 2094-2107 (1998/November-0)
A cluster of low-redshift Lyα clouds toward PKS 2155-304. I. Limits on metals and D/H.
SHULL J.M., PENTON S.V., STOCKE J.T., GIROUX M.L., VAN GORKOM J.H., LEE Y.H. and CARILLI C.
Abstract (from CDS):
We see no absorption from Si III λ1206, C IV λ1548, or deuterium Lyα at the expected positions of the strongest Lyα absorbers. Photoionization models yield (4 σ) limits of (Si/H) ≤ 0.003(Si/H)☉, (C/H) ≤ 0.005(C/H)☉, and (D/H) ≤ 2.8x10–4 if N(H I) has the ORFEUS value of 2x1016 cm–2. The limits increase to 0.023 solar metallicity and D/H ≤ 2.8x10–3 if N(H I) is only 2x1015 cm–2. These limits can be improved with further studies by HST/STIS and measurements of the Lyc and higher Lyman series absorption by FUSE. However, the current data suggest that the intergalactic gas in this group has not been enriched to the levels suggested by X-ray studies of intracluster gas. Because of their low metallicity and large distance from galaxies, these absorbers could be primordial gas clouds.
Abstract Copyright: ∼
Journal keyword(s): Cosmology: Observations - Galaxies: Abundances - ISM: H I - Galaxies: Quasars: Absorption Lines
Nomenclature: Table 3: [SPS98] HHMMSS.s-DDMMSS.s N=2.
CDS comments: p.2102: G4 = [FGM91] G4.
Simbad objects: 8
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