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Abstract: We present a multi-phase representation of the ISM in NB-TSPH simulations ofgalaxy formation and evolution with particular attention to the case ofearly-type galaxies. Cold gas clouds are described by the so-called stickyparticles algorithm. They can freely move throughout the hot ISM medium; starsform within these clouds and the mass exchange among the three baryonic phaseshot gas, cold clouds, stars is governed by radiative and Compton cooling andenergy feedback by supernova SN explosions, stellar winds, and UV radiation.We also consider thermal conduction, cloud-cloud collisions, and chemicalenrichment. Our model agrees with and improves upon previous studies on thesame subject. The results for the star formation rate are very promising andagree with recent observational data on early-type galaxies. These models lendfurther support to the revised monolithic scheme of galaxy formation, which hasrecently been also strengthened by high redshift data leading to the so-calleddownsizing and top-down scenarios.



Autor: Emiliano Merlin, Cesare Chiosi

Fuente: https://arxiv.org/







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