1998/10/23 by Ulrich Lindner, U. Lindner, Uta Fritze -- von Alvensleben +6
Chemistry · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Spectroscopy and Laser Applications #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9810388
20 pages Latex, accepted for publication in ASTRONOMY & ASTROPHYSICS
arxiv created 1998/10/23 · openalex publication_date 1998/10/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have extended our chemical and cosmological galaxy evolution model to\ncalculate the abundance evolution for altogether 16 different elements in\nspiral galaxies in a chemically consistent way which is a considerable step\ntowards a more realistic galaxy modeling. Our models well reproduce observed\naverage HII region abundances in all spiral types. All observed element\nabundances in DLA systems have been compiled. The conformity between observed\nand calculated abundances over the redshift range from z=4.5 through z=0.4\nindicates that DLA galaxies may well evolve into the full range of present- day\nspiral galaxies from Sa through Sd.\n Comparison of our chemically consistent models with models using only solar\nmetallicity input physics shows that differences in the redshift evolution are\nsmall for some elements but large for others. For those elements with large\ndifferences the chemically consistent models provide significant better\nagreement with observed DLA abundances.\n For typical spiral galaxies the star formation histories of our models\nclearly bridge the gap between high redshift DLA systems and the nearby spiral\ngalaxy population. The slow redshift evolution of DLA abundances is understood\nin terms of the long star formation timescales in galactic and proto-galactic\ndisks. Towards lower redshift z < 1.5 our models indicate that early type\nspirals drop out of the DLA samples as their gas content falls below ~50%.\nImplications for optical identification are discussed.\n