X-ray and radio variability in the low luminosity Active Galactic Nucleus NGC 7213Reportar como inadecuado



 X-ray and radio variability in the low luminosity Active Galactic Nucleus NGC 7213


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We present the results of a ~ 3 year campaign to monitor the low luminosity active galactic nucleus LLAGN NGC 7213 in the radio 4.8 and 8.4 GHz and X-ray bands 2-10 keV. With a reported X-ray Eddington ratio of 7 x 10^-4 L Edd, NGC 7213 can be considered to be comparable to a hard state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time lag between events in the X-ray and radio bands to be 24 +- 12 days lag 8.4 GHz radio lagging X-ray, and 40 +- 13 days lag 4.8 GHz radio lagging X-ray. The radio-radio light curves are extremely well correlated with a lag of 20.5 +- 12.9 days 4.8 GHz lagging 8.4 GHz. We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L {R} \propto M^{0.6-0.8} L {X}^{0.6}, known as the `fundamental plane of black hole activity, and show that NGC 7213 lies very close to the best-fit `global correlation for the plane as one of the most luminous LLAGN. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the fundamental plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the plane, we show that there is intrinsic scatter with respect to the plane for the individual data points.



Autor: M. E. Bell; T. Tzioumis; P. Uttley; R. P. Fender; P. Arevalo; E. Breedt; I. McHardy; D. E. Calvelo; O. Jamil; E. Koerding

Fuente: https://archive.org/







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