| Name: | Salmoli Ghosh |
| Affiliation: | National Centre for Radio Astrophysics (NCRA-TIFR), Pune |
| Conference ID: | ASI2025_402 |
| Title: | Understanding Radio-quiet AGN Jet Morphologies and Feedback Mechanisms from Parsec to Kiloparsec Scales |
| Authors: | Salmoli Ghosh 1, Preeti Kharb 1, Biny Sebastian 2,3, Jack Gallimore 4, Alice Pasetto 5, Christopher P. O'Dea 2, Timothy Heckman 6, Stefi A. Baum 2 |
| Authors Affiliation: | 1 National Centre for Radio Astrophysics, Pune-411007, India
2 University of Manitoba, Winnipeg, Manitoba, Canada
3 Space Telescope Science Institute, Baltimore, MD 21218, USA
4 Bucknell University, Lewisburg, PA 17837
5 Instituto de Radioastronom\'ia y Astrof\'isica (IRyA-UNAM), Morelia, Mexico
6 Johns Hopkins University, Baltimore, MD 21218, USA
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| Mode of Presentation: | Oral |
| Abstract Category: | Galaxies and Cosmology |
| Abstract: | The discovery of kiloparsec-scale radio structures (KSRs) in radio-quiet (RQ) AGN offers a unique opportunity to address questions about the origins of radio emission in RQ AGN, differences in radio-loudness, and why RQ jets are typically confined within host galaxies compared to radio-loud (RL) jets, which can extend into the IGM. Using interferometric telescopes worldwide with resolutions spanning parsec to kiloparsec scales allows us to investigate these phenomena in unprecedented detail. For instance, near the jet-launching region, ~80% of flux is lost from milliarcsecond to arcsecond scales, indicating a decrease in emission compactness with distance (e.g., Orienti & Prieto 2010). We are primarily focused on identifying the causes of jet de-collimation or widening. Our study examines nine KSRs, including Seyferts and LINERs from the CfA and extended-12micron samples, using a suite of telescopes, namely, VLBA, EVN, eMERLIN, VLA, uGMRT to probe jet-medium interactions at multiple scales. We report findings on phenomena such as jet-bending, jet-braking, jet-flaring, and instances of multiple restarted activities. These results are consistent with theoretical simulations (e.g., Saxton et al. 2005; Mukherjee et al. 2018), providing key constraints on jet dynamics and the surrounding medium’s properties. In a broader sample of RQ AGN, our analysis also includes polarization, total intensity, and spectral index imaging at kiloparsec scales, revealing dependencies of jet kinetic power on black hole mass that potentially inform jet-launching mechanisms. Observed magnetic field orientations suggest significant AGN-driven contributions, including AGN winds, while optical emission near the radio regions indicate gas entrainment, evacuation, and ionization—signifying both positive and negative feedback. We will present observational results from a multi-scale, multi-band study of RQ AGN providing insights about jet-medium interaction for these sources. |
