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

Author:

Fernandez Luis C.ORCID,Secrest Nathan J.ORCID,Johnson Megan C.ORCID,Fischer Travis C.ORCID

Abstract

Abstract 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 × 1044 and 1 × 1048 erg for the expulsion scenario or between 3 × 1050 and 1 × 1052 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.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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