Abstract Details

Name: Chayan Mondal
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2021_307
Title : Multi-wavelength study of star formation in nearby galaxies
Authors and Co-Authors : Chayan Mondal, Indian Institute of Astrophysics, Advisor: Annapurni Subramaniam, Indian Institute of Astrophysics
Abstract Type : Oral
Abstract Category : Thesis
Abstract : The thesis presents one of the first studies highlighting the unique capability of the instrument Ultra-Violet Imaging Telescope (UVIT) in identifying star-forming regions in nearby galaxies up to smaller length scales ($\sim$ 10 - 25 pc for a distance up to 1 - 4 Mpc). This improvement in the spatial limit has helped us characterize the structure and the hierarchical nature of star-forming clumps in UV better than the GALEX. Our study demonstrates that the FUV and NUV fluxes together can help to characterize (i.e., age, mass) unresolved stellar clumps of age up to a few hundred Myr in nearby galaxies. We studied two dwarf irregular (WLM, IC~2574) and two spiral (NGC~7793, NGC~300) galaxies using multi-band data and understand that the star formation in these galaxies has some connection with different feedback, such as stellar feedback or spiral density wave, or ram pressure. The stellar feedback is found to play a crucial role in controlling the recent star formation and redistributing the neutral ISM in both the dwarf systems. We noticed both the spiral galaxies to support the inside-out disk growth scenario with enhanced star formation along the spiral arms. We found the sizes of the star-forming regions detected by the UVIT in these galaxies have a range between $\sim$ 10 - 150 pc, which is similar to the sizes of OB associations in nearby dwarf and spiral galaxies. We also noticed that star formation is favoured mostly in locations with H~I column density greater than $10^{21}cm^{-2}$.