Speaker
Dr
Neil Crighton
(MPIA)
Description
I will present observations of the distribution and covering fraction of metal-enriched gas around star-forming galaxies at redshift ~2.5. Using high resolution spectra of background quasars at impact parameters from ~70 to 300 kpc from foreground galaxies, we have measured precise column densities from both cool ~10^4 K and hotter ~10^5 K gas. We compare our results to those for star-forming galaxies at redshifts < 0.5, and to complementary measurements made at z~2.5 using composite, lower resolution spectra of galaxy pairs. Finally we discuss the implications for the extent of the metal-enriched CGM at z~2.5 and for its evolution to the present day.
