报告人：吕建伟　 博士 （Arizona大学）

时间：2016年1月5日下午4：00

地点：东区理化大楼18层天文台报告厅

报告摘要：In the local Universe, the correlation between the masses of supermassive black holes (SMBHs) and the properties of their host galaxies suggests that galaxies and SMBHs possibly coevolve. With the use of ground- and space-based facilities, now we can explore both the stellar and SMBH growth at very early stages in galaxy evolution. In this talk, I will show that the host galaxies of z>5 quasars are likely to have a similar SED as Haro 11, a compact, moderately low-metallicity, star-bursting galaxy, but less likely to be local normal (~solar metallicity) galaxies. With a very simple SED decomposition model, we went through almost all quasars with rest-frame IR/submm obervations at z>5, and estimated an average SFR~400-600 M_sun/yr. If we assume these host galaxies maintain a constant AVERAGE SFR during their mass assembly, such a <SFR> would be sufficient to build up a massive host galaxies with (3-5)*10^11 M_sun, suggesting that a local M_BH/M* can be established when the Universe age is around only 1 Gyr. Meanwhile, after taking averages, these z>5 quasars shares a similar correlation between star formation and AGN bolometric luminosity as quasars at z<2.5.