Metal systems of the Lyman forest
| dc.creator | Boksenberg, Alec | |
| dc.date | 1997-10-23 | |
| dc.date.accessioned | 2026-07-07T02:24:45Z | |
| dc.date.available | 2026-07-07T02:24:45Z | |
| dc.description | An extremely careful analysis of the forest of weak metal-line systems at z ~ 2 has allowed the separation into individual `single-phase ionization' components with accurate parameters. The systems typically span several hundred km/s and within each the components show a strong coherence in their ionization properties. A general feature of the observed systems is the presence of high ionization broad components which co-exist in velocity space with more numerous, narrow, lower ionization components. From a sample of components extending to z ~ 3.5, taken either individually or as system totals, no rapid evolution is found in the column density ratio N(Si IV)/N(C IV), contrary to previous indication of a large change near z = 3.1. Comparisons of component ion ratios including Si IV, C IV, C II and Si II from the sample at z ~ 2 with CLOUDY derived values using several model ionizing spectra show the general dominance of the metagalactic ionizing background over local stellar radiation and give Si/C distributed 1-3 times the solar value. Indications of the evolution of structure are highlighted. | |
| dc.description | 6 pages, LaTex with 7 Postscript figures included. Uses conf_iap.sty. To appear in Structure and Evolution of the IGM from QSO Absorption Line Systems, Proc. 13th IAP Colloquium, eds. P. Petitjean and S. Charlot, Nouvelles Frontieres, Paris | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9710258 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9710258 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/11684 | |
| dc.subject | Astrophysics | |
| dc.title | Metal systems of the Lyman forest | |
| dc.type | text |