Mon. Not. R. Astron. Soc., 440, 2976-2987 (2014/June-1)
Very Large Baseline Array observations of Mrk 6: probing the jet-lobe connection.
KHARB P., O'DEA C.P., BAUM S.A., HARDCASTLE M.J., DICKEN D., CROSTON J.H., MINGO B. and NOEL-STORR J.
Abstract (from CDS):
We present the results of high-resolution VLBI (very long baseline interferometry) observations at 1.6 and 4.9 GHz of the radio-loud Seyfert galaxy, Mrk 6. These observations are able to detect a compact radio core in this galaxy for the first time. The core has an inverted spectral index (α^1.6_4.9 = +1.0±0.2) and a brightness temperature of 1x108 K. Three distinct radio components, which resemble jet elements and/or hotspots, are also detected. The position angles of these elongated jet elements point not only to a curved jet in Mrk 6, but also towards a connection between the AGN and the kpc-scale radio lobes/bubbles in this galaxy. Firmer constraints on the star formation rate provided by new Herschel observations (SFR < 0.8 M☉/yr) make the starburst-wind-powered bubble scenario implausible. From plasma speeds, obtained via prior Chandra X-ray observations, and ram pressure balance arguments for the interstellar medium and radio bubbles, the north-south bubbles are expected to take 7.5x106 yr to form, and the east-west bubbles 1.4x106 yr. We suggest that the jet axis has changed at least once in Mrk 6 within the last ~107 yr. A comparison of the nuclear radio-loudness of Mrk 6 and a small sample of Seyfert galaxies with a subset of low-luminosity FR I radio galaxies reveals a continuum in radio properties.
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)
techniques: high angular resolution - techniques: interferometric - galaxies: active - galaxies: individual: Mrk 6 - galaxies: jets - galaxies: Seyfert
Fig. 1: [KOB2014] AN (Nos N, S1-S2). Paragr. 3: [KOB2014] Mrk 6 radio core N=1.
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