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SOFIA Tele-Talk

August

08

[CII] Emission from Photo-Dissociation Regions and Jet-related Shocks in the Nearby Seyfert Galaxy NGC 4258 with SOFIA
Phil Appleton (IPAC) and Dario Fadda (SOFIA Science Center)

Abstract: We present the [CII] 157.7μm map of the NGC 4258 (M106) galaxy obtained with the Far Infrared Field-Imaging Line Spectrometer (FIFI-LS) spectrometer onboard SOFIA. M106 contains an active nucleus classified as type 1.9 Seyfert with a warped inner rotating disk of water-vapor masers which allowed for the first high accuracy measurements of the mass of a supermassive black hole in any galaxy.

A relativistic jet is thought to be responsible for anomalous radio-continuum spiral arms, which appear several kiloparsecs from the center, and extend outwards through the outer disk. These arms do not correlate with the galaxy's underlying stellar spiral structure, and their presence suggest that in the past, the jet has strongly interacted with the galaxy's outer disk, exciting synchrotron radiation. Since that time, a new burst of activity seems to have occurred, creating a compact jet at the core of the galaxy, and two radio hotspots further out associated with optical "bow-shocks." The position angle of this new "active" jet is different from that needed to excite the outer radio arms, presumably because the jet has precessed, perhaps as a result of precession of the axis of the inner warped accretion disk.

SOFIA community Tele-Talks feature cutting-edge SOFIA science as well as science-related engineering and technology. This series, which has been on-going for more than a decade, was originally chartered by SOFIA mission operations. The Tele-Talks are given by the principals doing the work. The cadence is approximately twice a month, on Wednesdays at 9 a.m., Pacific time, which allows for European participation.

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Date August 08, 2018
Start/End Time 12:00 PM - 01:00 PM
Location Tele-Talk
Website https://sofiatt.spiritastro.net/agenda.htm
Event Type Seminars/Colloquia
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