Stellar Populations, Assembly Histories and the IMF of ETGs

Speaker: Meng Gu

Massive quiescent galaxies have been confirmed at high-z

GS-9209: z=4.7

Stellar Population Synthesis

Spectral features change with

• age and metallicity
• variation of elemental abundance

More massive galaxies are older and more $\alpha$ element enhanced.

Measure IMF

NaI, CaII, and FeH lines are important for the measurement of IMF.