FRAMEx. IV. Mechanical Feedback from the Active Galactic Nucleus in NGC 3079

• Published in: The Astrophysical journal 2023-11, Vol.958 (1), p.61
• Main Authors: Fernandez, Luis C., Secrest, Nathan J., Johnson, Megan C., Fischer, Travis C.
• Format: Article
• Language: English
• Subjects: Active galactic nuclei; Astrophysics; Brightening; Expulsion; Feedback; Interstellar matter; Interstellar medium; Radio active galactic nuclei; Radio jets; Very long baseline interferometry; X-ray active galactic nuclei
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/acfeda

Using the Very Long Baseline Array, we observed the active galactic nucleus (AGN) in NGC 3079 over a span of six months to test for variability in the two main parsec-scale radio components, A and B , which lie on either side of the AGN. We found evidence for positional differences in the positions of A and B over the six months consistent with the apparent motion of these components extrapolated from older archival data, finding that their projected rate of separation, (0.040 ± 0.003) c , has remained constant since ∼2004 when a slowdown concurrent with a dramatic brightening of source A occurred. This behavior is consistent with an interaction of source A with the interstellar medium (ISM), as has previously been suggested in the literature. We calculated the amount of mechanical feedback on the ISM for both the scenario in which A is an expulsion of material from the central engine and the scenario in which A is a shock front produced by a relativistic jet, the latter of which is favored by several lines of evidence we discuss. We find that the cumulative mechanical feedback on the ISM is between 2 × 10 44 and 1 × 10 48 erg for the expulsion scenario or between 3 × 10 50 and 1 × 10 52 erg for the jet scenario. Integrated over the volume-complete Fundamental Reference AGN Monitoring Experiment (FRAMEx) sample, our results imply that jet-mode mechanical feedback plays a negligible role in the energetics of AGNs in the local Universe.