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AGN SIG Seminar

Active Galactic Nuclei Science Interest Group

DATE

Nov 22, 2022

TIME

12:00 pm EST

COMMUNITY

AGN SIG

TYPE

Seminar

JWST / MIRI MRS view of the jet-ISM interaction in NGC 7319. Missing jet energy?

Miguel Pereria Santaella

Feedback from AGN plays a central role in the evolution of galaxies according to simulations. In particular, radio-jet/kinetic mode AGN feedback, which takes place in low accretion AGN, can be an important evolution driver for the majority of galaxies. Contrary to high-power radio jets, which easily pierce the ISM, low-power radio jets are expected to remain for a longer time trapped in the ISM around the AGN affecting larger gas volumes, thus potentially having a much larger impact on the nuclear regions. MIRI/MRS mid-IR spectroscopy of NGC7319 (the largest spiral in the Stephan’s Quintet which hosts a type 2 Seyfert AGN with a low-power radio jet) was obtained as part of the JWST Early Release Observations. In this talk I will present the initial analysis of the MIRI data which, for the first time, spatially resolve the interaction between the radio jet and the ISM. We detect extended high-ionization emission ([MgV], [NeVI], and [NeV]) close to the jet axis and enhanced warm/hot molecular H2 and ionized gas emission at the radio hotspots. The mechanical energy of these gas phases at the radio hotspots is <1% of the jet energy, well below the expected value from relativistic jet simulations. I will discuss possible scenarios to explain this result which is apparently at odds with the predictions of simulations.

Find the schedule and list of speakers on our website.

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An illustration of Sun-like star HD 181327 and its surrounding debris disk. The star is at top right. It is surrounded by a far larger debris disk that forms an incomplete ellpitical path and is cut off at right. There’s a huge cavity between the star and the disk. The debris disk is shown in shades of light gray. Toward the top and left, there are finer, more discrete points in a range of sizes. The disk appears hazier and smokier at the bottom. The star is bright white at center, with a hazy blue region around it. The background of space is black. The label Artist's Concept appears at lower left.