A study of galaxy evolution: stacking emission lines from distant galaxies
Line stacking allows to get around intrinsic limitations in spectral observations, by averaging large galaxy samples, leading to drastic SNR improvement. However stacking, and especially line stacking, is not straightforward and requires a good handle of the population distribution, along with the output stack. To facilitate the use of such method, and to make data analysis tightly linked to stacking accessible, we produced an open source/open access tool, Line-Stacker.
After introducing the current state of knowledge on galaxy evolution, I will present Line-Stacker, describing both its main algorithm as well as the embedded data analysis tools. I will then introduce the two included papers and present their results. Paper I consists in a thorough description of Line-Stacker, and its test on numerous different simulated data-sets. Paper II is the first application of Line-Stacker on real data, in which we studied outflows from z ∼ 6 quasars.
Galaxies: evolution – Galaxies: high-redshift – methods: stacking – methods: data analysis – techniques: interferometric
Jean Baptiste Jolly
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Extragalaktisk astrofysik
Astronomi, astrofysik och kosmologi
Chalmers tekniska högskola
EA room, Hörsalsvägen 11, 412 58 Göteborg
Opponent: Martin Zwaan, ESO, Germany