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Metals in high redshift galaxies
  Astronomy and astrophysics

Friday 30 October 2015
from 10:30 to 11:30
at FC61
Speaker : Lise Christiansen (DARK Cosmology Centre, Copenhagen)
Abstract : Determining the chemical abundances is a key part in understanding the evolution and nature of high redshift galaxies. We can only measure metallicities with spectroscopic observations but since galaxies become increasingly faint with redshift we have to rely on stacking of many galaxy spectra or use scaling relations that are derived from observations of low redshift galaxies. Strong gravitational lensing that boosts the flux from background sources allow us to check that the scaling relations are also valid in the high redshift universe. A more uniform way to measure metallicities in high redshift galaxies comes from galaxy absorption lines, either seen in quasar or gamma-ray burst spectra that randomly probe intervening galaxies. However, it is not well established how metallicities derived in emission correlate with that in absorption. In this talk I will review recent analyses of the metallicities in high redshift galaxies based on different observational techniques, and recent efforts in combining information from galaxies seen in emission and absorption.

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