Progress on the semi-analytical model of galaxy formation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Semi-Analytical Model, Review, Galaxy Formation, Galaxy Evolution, Luminosity Function

Scientific paper

Based on the current popular hierarchical clustering model of Cold Dark Matter (CDM), The Semi-Analytical Model (SAM) of galaxy formation have made impressive progress. After introducing the reasonable prescription about the baryonic process, such as the gas cooling, star formation, energy feedback from supernova and AGN, the SAM succeeds in predicting many observations. On one hand, SAM can match the observations of local galaxy population, which include the luminosity function, the two-point correlation function, Tully-Fisher relation, the color-magnitude relation. On the other hand, SAM also match observations of high-redshift universe, such as the cosmic star formation history, and the redshift-distribution of Lyman-Break galaxies. But some recent evidence implies that SAM redicts less massive galaxies at high redshift, and insufficient number of extremely red objects. In this review, we discuss the success and failure of SAM, and give hint on how to improve the SAM.

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