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Mutie, Isaac M; Williams-Baldwin, David; Beswick, Robert J; Bempong-Manful, Emmanuel K; Baki, Paul O; Muxlow, Tom W B; Gallimore, Jack F; Aalto, Susanne E; Dullo, Bililign T; Baldi, Ranieri D
Monthly Notices of the Royal Astronomical Society, 02/2024, Letnik: 527, Številka: 4Journal Article
ABSTRACT We present new high-sensitivity e-MERLIN and Very Large Array (VLA) radio images of the prototypical Seyfert 2 galaxy NGC 1068 at 5, 10, and 21 GHz. We image the radio jet, from the compact components north-east (NE), C, S1, and S2 to the faint double-lobed jet structure of the NE and south-west (SW) jet lobes. We map the jet between 15 kλ and 3300 kλ spatial scales by combining enhanced-Multi Element Radio Linked Interferometer Network (e-MERLIN) and VLA data for the first time. Components NE, C, and S2 have steep spectra indicative of optically thin non-thermal emission domination between 5 and 21 GHz. Component S1, which is where the active galactic nucleus resides, has a flat radio spectrum. We report a new component, S2a, a part of the southern jet. We compare these new data with the MERLIN and VLA data observed in 1983, 1992, and 1995 and report a flux decrease by a factor of 2 in component C, suggesting variability of this jet component. With the high angular resolution e-MERLIN maps, we detect the bow shocks in the NE jet lobe that coincide with the molecular gas outflows observed with ALMA. The NE jet lobe has a jet power of $P_{\rm jet-NElobe}\, =\,$ 6.7 × 1042 erg s−1 and is considered to be responsible for driving out the dense molecular gas observed with ALMA around the same region.
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