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X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213
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Bell, M. E., Tzioumis, T., Uttley, P., Fender, R. P., Arévalo, P., Breedt, E., McHardy, Ian M., Calvelo, D. E., Jamil, O. and Körding, E. (2010) X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213. Monthly Notices of the Royal Astronomical Society, Vol.411 (No.1). pp. 402-410. doi:10.1111/j.1365-2966.2010.17692.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2010.17692.x
Abstract
We present the results of a similar to 3 yr 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 d lag (8.4 GHz radio lagging X-ray) and 40 +/- 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 +/- 12.9 d (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) proportional to 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-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. 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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
| Publisher: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 2010 | ||||
| Dates: |
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| Volume: | Vol.411 | ||||
| Number: | No.1 | ||||
| Page Range: | pp. 402-410 | ||||
| DOI: | 10.1111/j.1365-2966.2010.17692.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Commonwealth of Australia, PPARC , NASA | ||||
| Grant number: | NAG5-7385 NAG5-7067 (NASA) |
Data sourced from Thomson Reuters' Web of Knowledge
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