| Name: Debbijoy Bhattacharya |
| Affiliation: Manipal Centre for Natural Sciences, Manipal Academy of Higher Education |
| Conference ID: ASI2026_1064 |
| Title: Probing AGN feedback on star formation in nearby galaxies with AstroSat-UVIT |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: Debbijoy Bhattacharya(Manipal Centre for Natural Sciences, Manipal Academy of Higher Education, Karnataka, Manipal, 576104, India), B Ananthamoorthy(Manipal Centre for Natural Sciences, Manipal Academy of Higher Education, Karnataka, Manipal, 576104, India), P. Sreekumar(Manipal Centre for Natural Sciences, Manipal Academy of Higher Education, Karnataka, Manipal, 576104, India) |
| Abstract: Active galactic nuclei (AGNs) can influence the physical properties of their host galaxies through processes collectively known as AGN feedback. Though theoretical models/simulations suggest a significant impact of AGN activity on the host galaxy, direct observational evidence linking AGN feedback to star formation, particularly in nearby galaxies, remains limited. We primarily utilized high-resolution observations from the UltraViolet Imaging Telescope (UVIT) onboard AstroSat to investigate the possible role of radiative-mode AGN feedback on the star formation properties of the host galaxy. Given the low background counts in UVIT images, we implemented a source detection method that explicitly accounts for the Poisson nature of the UV background. This approach efficiently detects fainter sources compared to conventional methods used for UVIT source detection, yielding 15–90% more sources. Applying this technique, we detected star-forming knots in six AGN-host and four non-AGN barred spiral galaxies to examine the influence of radiative-mode AGN feedback on star formation. We have noticed that the surface densities of the star formation rate and FUV attenuation for the knots decline less rapidly in the outskirts of AGN host galaxies compared to non-AGN galaxies. These results suggest a possible radiative mode positive AGN feedback in the outer disks of low-luminosity AGNs, highlighting a potential role of AGN activity in regulating star formation on galactic scales.
Part of this work has been published as B. Ananthamoorthy, D. Bhattacharya et al., 2024, AJ, 168, 22, and B. Ananthamoorthy, D. Bhattacharya et al., 2025, PASA, 42, e154.
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