On the Origin of Nitrogen in Damped Ly-alpha Systems
| dc.creator | Henry, R. B. C. | |
| dc.creator | Prochaska, Jason X. | |
| dc.date | 2002-11-22 | |
| dc.date.accessioned | 2026-07-07T02:06:31Z | |
| dc.date.available | 2026-07-07T02:06:31Z | |
| dc.description | Recent measurements of nitrogen and alpha elements in over 20 damped Ly-alpha systems (DLA) are compared with similar measurements for numerous emission line objects and stars. It is found that the DLA distribution in the N/alpha-alpha/H plane is bimodal, where most sample DLAs fall along the N/alpha plateau defined at low Z by dwarf irregulars, while a small group possesses N/alpha values roughly 0.7 dex less than those on the plateau at similar alpha/H values. We demonstrate with chemical evolution models that a top-heavy or truncated IMF can account for the low N in this second group. | |
| dc.description | 7 pages, in ``CNO in the Universe,'' ASP Conference Series, in press edited by C. Charbonnel, D. Schaerer, and G. Meynet | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0211512 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0211512 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/5390 | |
| dc.subject | Astrophysics | |
| dc.title | On the Origin of Nitrogen in Damped Ly-alpha Systems | |
| dc.type | text |