Are there any Young Galaxies in our local universe?

Details Are there any Young Galaxies in our local universe? Are there any Young Galaxies in our local universe?

2001-02-06

arxiv.org/abs/astro-ph/0102096v1

Astrophys.Space Sci. 277 (2001) 281-286

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. To appear in proceedings of the Euroconference: ''The Evolution of Galaxies. I - Observational Clues'' eds

Scientific paper

10.1023/A:1012788131006

We find no evidence for the presence of genuinely young galaxies in our Local universe. We argue that the metal deficiencies and the behavior of the N/O and C/O ratios meet several plausible explanations involving the primary and secondary nature of these elements and their dispersion and mixing by massive stars and intermediate mass stars. Colors are to be analysed using surface photometry and comparing several model scenario since an instant burst model unavoidably provides a lower limit to the age. Ultimately colour-magnitude diagram techniques will be the only direct test to be performed at least on a small number local starburst galaxies. Our present analysis provides important warning for assessing the true age of distant galaxies.

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