Abstract Details
| Name: Amrutha S Affiliation: Indian Institute of Astrophysics Conference ID: ASI2025_583 Title : Understanding Stellar Initial Mass Function in the different regions of NGC 628 using MUSE and UVIT observations Authors and Co-Authors : S Amrutha 1,2, Mousumi Das 1 Abstract Type : Poster Abstract Category : Galaxies and Cosmology Abstract : We present a pilot study on the high-mass end of the stellar initial mass function (IMF) in NGC 628. We focus on variations across the arm, interarm, and spur regions. Our research emphasizes H$\alpha$ emission primarily detected from O stars, using VLA/MUSE, as well as UV emissions from both O and B stars obtained with UVIT in star-forming clumps (SFCs). We estimated the populations of O stars and massive B stars (mass above 10 solar mass). Subsequently, we found the median stellar IMF index for each region. Our findings indicate that the IMF index steepens when SFCs are populated with O stars of mass up to 100 solar mass. Notably, the interarm region exhibits a steeper, bottom-heavy IMF than the arms and spurs across all cases. Furthermore, the ratio of massive to less massive B stars (with masses ranging from 3 to 10 solar mass) yields a consistent IMF value, even when O stars are populated differently, making B star mass ratios a more reliable indicator of the IMF. We also present variations of the IMF with different properties of the SFCs, which gives crucial results in understanding the IMF. |