Astronomy and Astrophysics, volume 616A, 152-152 (2018/8-1)
15-GHz radio emission from nearby low-luminosity active galactic nuclei.
SAIKIA P., KORDING E., COPPEJANS D.L., FALCKE H., WILLIAMS D., BALDI R.D., McHARDY I. and BESWICK R.
Abstract (from CDS):
We present a sub-arcsec resolution radio imaging survey of a sample of 76 low-luminosity active galactic nuclei (LLAGN) that were previously not detected with the Very Large Array at 15GHz. Compact, parsec-scale radio emission has been detected above a flux density of 40µJy in 60% (45 of 76) of the LLAGN sample. We detect 20 out of 31 (64%) low-ionization nuclear emission-line region (LINER) nuclei, ten out of 14 (71%) low-luminosity Seyfert galaxies, and 15 out of 31 (48%) transition objects. We use this sample to explore correlations between different emission lines and the radio luminosity. We also populate the X-ray and the optical fundamental plane of black hole activity and further refine its parameters. We obtain a fundamental plane relation of log LR=0.48(±0.04)log LX+0.79(±0.03)logM and an optical fundamental plane relation of log LR=0.63(±0.05)logL[OIII]+0.67(±0.03)logM after including all the LLAGN detected at high resolution at 15GHz, and the best-studied hard-state X-ray binaries (luminosities are given in erg/s while the masses are in units of solar mass). Finally, we find conclusive evidence that the nuclear 15GHz radio luminosity function (RLF) of all the detected Palomar Sample LLAGN has a turnover at the low-luminosity end, and is best-fitted with a broken power law. The break in the power law occurs at a critical mass accretion rate of 1.2x10–3M☉/yr, which translates to an Eddington ratio of mEdd∼5.1x10–5, assuming a black hole mass of 109M☉. The local group stands closer to the extrapolation of the higher-luminosity sources, and the classical Seyferts agree with the nuclear RLF of the LLAGN in the local universe.
© ESO 2018
galaxies: active - galaxies: nuclei - galaxies: jets - radio continuum: galaxies - galaxies: luminosity function, mass function
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