Jets, Arcs and Shocks: NGC 5195 at radio wavelengths
Date Submitted
2017-04-07 15:40:52
AGNsLocal
Hayden Rampadarath
Univeristy of Manchester
Poster
We present a radio study of the nearby galaxy, NGC~5195, located in the M51 system. Using
multi-wavelength archive data from the VLA, we report on the discovery of a collimated outflow that extends 15” (0.6 kpc) from the central (AGN) and an arc of radio emission 20” - 40” (0.8 - 1.6 kpc) South of the nucleus. The jet and radio-arc are coincident with a pair of arcs previously discovered in both X-rays and Halpha. Archive VLA polarisation maps reveal linearly polarisation emission
that traces the magnetic field geometry and strength along the jet and radio-arc and, together with the spectral index distribution, argue in favour of shock-generated emission typical of large-scale radio-jets. These results suggest that the radio-jet is inflating the surrounding medium giving rise to the
X-ray arcs. Using the Halpha emission as a shock tracer, we show that based upon energetics, the radio jet has sufficient power to create the arcs. The nucleus of NGC~5195 falls on the black hole fundamental plane and is accreting at 1e-6 Eddington. Thus we suggest that the X-ray and radio emission are both coming from the jet. Using the e-MERLIN array the unresolved VLA core is resolved into a parsec-scale core-jet source, typical of low-luminosity AGN.