A multi-faceted approach to advancing galaxy-cosmic web studies
Ulrike Kuchner
Our work addresses multiple aspects critical to the topic of this conference. We 1) investigate the relationship between local density, cosmic web components, and galaxy evolution; 2) improve cosmic web reconstructions in large volumes; and 3) explore the cultural, social, and technological dimensions of this scientific knowledge production. Using SDSS data in slices around a number of galaxy clusters, we confirm that galaxies in filaments are less star-forming and more likely to have early-type morphologies than those in the field. These trends persist even after accounting for stellar mass, suggesting a significant environmental influence.
However, when local galaxy density is also controlled, differences between filament and field populations disappear, indicating that the effect of filaments can be parameterised by a local galaxy density index. We now extend this analysis to 1) investigate star-formation timescales and potential outflows together with direct observables such as morphology, colour, and line index ratios; and 2) focus on lower mass galaxies with the WEAVE spectrograph. In parallel, we assess the quality of filament extraction with the DisPerSE filament finder from photometric redshifts in the very large Euclid Wide Survey and spectroscopic data in Euclid’s Deep fields.
Using simulations of the Euclid Wide survey, we develop and test methods to compare skeletons derived from photometric redshifts to “true” positions and assess whether new approaches strengthen our ability to correctly identify filaments. For the Euclid Deep Survey, redshift uncertainties, biases and the Fingers-of-God effect still challenge filament detection, however these issues can be partially resolved by anisotropic group finders and stellar mass weighting. We still expect to be able to recover key galaxy property gradients, albeit with reduced significance. We further improve approaches to extract filaments in the 1Gpc/h cosmological cube MDPL2 and investigate them. In a unique angle of our research, we also explore the artistic, philosophical and social perspectives of arriving at new scientific knowledge, including for large-scale structure studies. Our transdisciplinary angle examines how creative collaborations with artists and extended reality technologies impacts scientific inquiry and our models of the universe.
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