On the origin of the luminosity - metallicity relation for late-type galaxies: Spirals to irregulars transition

Details On the origin of the luminosity - metallicity relation for late-type galaxies: Spirals to irregulars transition On the origin of the luminosity - metallicity relation for late-type galaxies: Spirals to irregulars transition

2000-01-05

arxiv.org/abs/astro-ph/0001057v1

Astrophys.Space Sci. 277 (2001) 441-444

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

We consider the roles of two widely invoked mechanisms for the metallicity-luminosity correlation among late-type galaxies: higher astration level and decreasing efficiency of heavy-element loss with increasing luminosity. We find that both mechanisms contribute about equally to the range in oxygen abundance between low (logL_B = 8) and high (logL_B = 10.5) luminosity galaxies. We also consider the transition from spirals to irregulars, finding that both the oxygen abundance deficiency (indicating the degree of mass exchange between a galaxy and its environment) and the gas fraction vary smoothly along the sequence. Thus we find no "irregular versus spiral dichotomy".

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