Steeper, Flatter, or Just "Salpeter"? Evidence from Galaxy Evolution and Galaxy Clusters

Details Steeper, Flatter, or Just "Salpeter"? Evidence from Galaxy Evolution and Galaxy Clusters Steeper, Flatter, or Just "Salpeter"? Evidence from Galaxy Evolution and Galaxy Clusters

2004-10-12

arxiv.org/abs/astro-ph/0410295v2

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures, to appear on "IMF@50: The Initial Mass Function 50 Years Later", ed. E. Corbelli, F. Palla, & H. Zinnecke

Scientific paper

A single-slope "Salpeter" IMF overpredicts the stellar M/L ratio of local elliptical galaxies by about a factor of 2, which requires the IMF to be flatter below about one solar mass. On the other hand a Salpeter IMF for stars more massive than the sun predicts an evolution with redshift of the fundamental plane of ellipticals in clusters which is in agreement with the observations and a formation at z>~3 for these galaxies. A "Salpeter" IMF for 1

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