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Abstract: Observations of CO molecules in the millimetrer domain at high redshiftlarger than 1, have provided interesting informations about star formationefficiency, and its evolution with redshift. Due to the difficulty of thedetections, selection effects are important. The detection if often due togravitational amplification. Objects selected by their farinfrared flux, arein general associated to ULIRGS, mergers with starburst in the nuclear regions.Quasars have been selected as powerful optical sources, and have been found tobe associated to starbursts, rich in gas. The gas fraction appears to be muchhigher at redshift greater than 1.Quasars allow to probe the end of the reionisation period, and the relationbetween bulge and black hole mass. However these selection bias could have ledus to miss some gaseous galaxies, with low-efficiency of star formation, suchas the more quiescent objects selected by their BzK colors at z=1.5 or 2.



Autor: Francoise Combes LERMA, Obs-Paris

Fuente: https://arxiv.org/



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