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Type of talk
Seminar
Speaker
Dr. Unnikrishnan Sureshkumar
Affiliation
Wits Centre for Astrophysics
Date and Time of Talk
Venue
auditorium
Abstract
The physical properties of galaxies — such as luminosity, stellar mass, and star formation rate — are significantly correlated with their local environment. Understanding these environmental correlations is crucial for studying the evolution of galaxies in the large-scale structure of the Universe. Traditionally, such studies rely on local density measurements defined at a specific separation scale around galaxies. However, to fully capture the impact of the environment, it is essential to examine correlations across a wide range of scales. In this talk, I will demonstrate how clustering measurements effectively trace the environmental correlations of various galaxy properties as a function of separation scale. I will present results from our studies on the correlations of luminosities (from optical to mid-IR bands), stellar mass, and star formation rate with local environment. Additionally, I will show how clustering measurements help probe the environmental dependence of galaxy mergers. Our analysis is based on 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, a simulated sky catalogue designed for the Rubin Observatory LSST Dark Energy Science Collaboration. Finally, I will present our recent results on the environmental correlations of low-surface-brightness galaxies (LSBGs) identified in the Dark Energy Survey.
 
Email Speaker
unnikrishnan.sureshkumar@wits.ac.za
About Speaker

Dr. Unnikrishnan Sureshkumar is currently a SAAO-Rubin Observatory Postdoctoral Fellow at the Wits Centre for Astrophysics, South Africa. He completed his PhD in 2022 at the Jagiellonian University in Poland. He works in the research domain of observational cosmology, with a focus on the distribution of galaxies in the large-scale structure of the Universe and their relationship with various galaxy properties.

 

 

Email Host
kuntal@aries.res.in
Host Name
Kuntal Misra
Host Phone (ext/mob)
742