Open AccessChemo‐spectrophotometric evolution of spiral galaxies – III. Abundance and colour gradients in discs
Author(s) -
Prantzos N.,
Boissier S.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03228.x
Subject(s) - physics , astrophysics , spiral galaxy , luminosity , abundance (ecology) , disc , galaxy , galaxy formation and evolution , elliptical galaxy , milky way , disc galaxy , chemical evolution , scaling , astronomy , geometry , biology , mathematics , fishery
We study the relations between luminosity and chemical‐abundance profiles of spiral galaxies, using detailed models for the chemical and spectrophotometric evolution of galactic discs. The models are ‘calibrated’ on the Milky Way disc and are successfully extended to other discs with the help of simple ‘scaling’ relations, obtained in the framework of semi‐analytic models of galaxy formation. We find that our models exhibit oxygen abundance gradients that increase in absolute value with decreasing disc luminosity (when expressed in dex kpc −1 ) and are independent of disc luminosity (when expressed in dex scalelength −1 ), both in agreement with observations. We notice an important strong correlation between abundance gradient and disc scalelength. These results support the idea of ‘homologous evolution’ of galactic discs.