The Low-Redshift Lyman Alpha Forest toward PKS 0405-123

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dc.creatorWilliger, G. M.
dc.creatorHeap, S. R.
dc.creatorWeymann, R. J.
dc.creatorDave, R.
dc.creatorEllingson, E.
dc.creatorCarswell, R. F.
dc.creatorTripp, T. M.
dc.creatorJenkins, E. B.
dc.date2005-05-29
dc.date2005-08-31
dc.date.accessioned2026-07-07T10:27:30Z
dc.date.available2026-07-07T10:27:30Z
dc.descriptionWe present STIS 7km/s resolution data of the Ly-a forest toward PKS0405-123 (z=0.574). We make two samples. The strong sample (60 systems) has column density logNHI>13.3 over 0.002<z<0.423, and the weak sample (44) has logNHI>13.1 at 0.020<z<0.234; 7 absorbers show metals, all with OVI, but often offset in velocity from HI. The strong sample Doppler parameters show <b>=47+-22km/s; for the weak, <b>=44+-21km/s. Line blending and s/n effects likely inflate b. The redshift density dN/dz is consistent with previous, lower resolution results for logNHI>14.0. For 13.1<logNHI<14.0, we find a dN/dz overdensity of ~0.2-0.3 dex at 0.127<z<0.234, which we believe arises from cosmic variance. We find Ly-a clustering over Delta v<250km/s for logNHI>13.3, consistent with a numerical model. There is a void in the strong sample at 0.0320<z<0.0814. We detect radial velocity correlations for Delta v<250km/s between Ly-a absorbers and 39 galaxies in a 10' field. The correlation grows with minimum NHI, peaking for logNHI ~> 13.5-14.0. The strength is similar to that of the galaxy-galaxy correlation for our sample, implying that such Ly-a systems have mass log M/Msun= 11.3+1.0-0.6. Including lower column density systems in the sample shows correlations only out to Delta v <125km/s, as would be expected for smaller density perturbations. Galaxy counts and local HI column density appear correlated, peaking at ~5000km/s. We also give column densities for Galactic species. (Abridged)
dc.description59 pages, 6 tables, 14 figures, 1 standalone, ApJ, in press; minor revisions/clarifications for acceptance, including galaxy list
dc.identifierhttps://arxiv.org/abs/astro-ph/0505586
dc.identifierhttp://arxiv.org/abs/astro-ph/0505586
dc.identifierAstrophys.J.636:631-653,2006
dc.identifierdoi:10.1086/498127
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177167
dc.subjectAstrophysics
dc.titleThe Low-Redshift Lyman Alpha Forest toward PKS 0405-123
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