| Name: Nabil Husain |
| Affiliation: Indian Institute of Science Education and Research Mohali |
| Conference ID: ASI2026_85 |
| Title: Feedback-Driven Heating of the ISM Across Galactic Environments in NGC 3627: A Multiwavelength View |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: Nabil Husain(Indian Institute of Science Education and Research Mohali, Mohali - 140306, India), Smita Mathur(Ohio State University, Columbus - 43210, USA), Kulinder Pal Singh(Indian Institute of Science Education and Research Mohali, Mohali - 140306, India) |
| Abstract: Studying how feedback shapes the multiphase interstellar medium (ISM) on local scales is essential for understanding how galaxies regulate their baryon and energy cycles. Spatially resolved, multiwavelength observations of nearby galaxies provide a means to examine these processes beyond global scaling relations. In this context, we present a multiwavelength study of the barred spiral galaxy NGC3627 (D≈11.3 Mpc), focusing on the morphology and energetics of its hot ISM and its connection to recent star formation.
We combine FUV imaging, X-ray observations and optical data to map star formation across the bar and spiral arms and to examine its spatial correspondence with diffuse hot gas. The hot ISM exhibits multi-temperature thermal plasma components with temperatures of kT≈0.1-0.7 keV. While similar temperature ranges are found throughout the galaxy, their relative contributions vary with environment: the bar is dominated by a hotter component (kT≈0.6 keV) that accounts for most of the diffuse X-ray luminosity, whereas the spiral arms are dominated by a cooler component (kT≈0.2 keV). Diffuse X-ray emission spatially correlates with regions of enhanced FUV and Hα emission along the spiral arms, consistent with feedback from recent star formation. In contrast, the bar hosts hotter diffuse emission but reduced FUV flux, suggesting significant obscuration.
To further quantify the coupling between star formation and hot gas on local scales, we are extending this analysis to a spatially resolved framework based on star-forming clumps identified in the FUV. These regions are used to derive diffuse X-ray plasma temperatures and luminosities using hardness-ratio–based mapping incorporating Bayesian Estimation of Hardness Ratios (BEHR), together with Hα flux measurements.
Overall, this study highlights how feedback-driven heating of the ISM varies across galactic environments and demonstrates the importance of spatially resolved approaches for understanding the regulation of star formation in nearby galaxies. |
