Exploring the correlations between galaxy properties and environment in the large-scale structure using marked statistics
Invited Talk: Unnikrishnan Sureshkumar
Various galaxy properties such as luminosity, stellar mass, star formation rate and so on are known to be significantly correlated with the local environment of the galaxies. These correlations arise from the environmental dependence of their dark matter halo properties.
Studies on such environmental correlations are crucial for better understanding of galaxy evolution. These studies are generally done using local density measurements defined at a particular separation scale around the galaxies. However, it is essential to study environmental correlations on a wide range of scales. This approach helps in the investigation of environmental effects that are prevalent at different scales as well as minimising the impact of the chosen scale for density estimation. In this talk, I will show how marked correlation functions are efficient in tracing the environmental correlations of various galaxy properties simultaneously as a function of the separation scale. I will present results from our studies that investigated how luminosities in optical to mid-IR bands, stellar mass, and star formation rate are correlated with the local environment. Additionally, I will show how the marked correlation function is advantageous over traditional two-point correlation functions to explore the environmental dependence of galaxy mergers. Our analysis utilises stellar-mass-selected volume-limited galaxy samples from the Galaxy And Mass Assembly (GAMA) survey. We also compare our measurements from GAMA with those from CosmoDC2, the simulated sky catalogue designed for Rubin Observatory LSST Dark Energy Survey Collaboration.
Additionally, I will present our recent results on the environmental correlations of low surface brightness galaxies (LSBGs) selected from the Dark Energy Survey and North Ecliptic Pole Wide field.