|[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.
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|Date||August 08, 2018|
|Start/End Time||12:00 PM - 01:00 PM|
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