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http://hdl.handle.net/20.500.12386/32399
Titolo: | X-ray variability analysis of a large series of XMM-Newton +NuSTAR observations of NGC 3227 | Autori: | Lobban, A. P. Turner, T. J. Reeves, J. N. BRAITO, Valentina Miller, L. |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 494 | Fascicolo: | 4 | Da pagina:: | 5056 | Abstract: | We present a series of X-ray variability results from a long XMM-Newton + NuSTAR campaign on the bright, variable AGN NGC 3227. We present an analysis of the light curves, showing that the source displays typically softer-when-brighter behaviour, although also undergoes significant spectral hardening during one observation which we interpret as due to an occultation event by a cloud of absorbing gas. We spectrally decompose the data and show that the bulk of the variability is continuum-driven and, through rms variability analysis, strongly enhanced in the soft band. We show that the source largely conforms to linear rms-flux behaviour and we compute X-ray power spectra, detecting moderate evidence for a bend in the power spectrum, consistent with existing scaling relations. Additionally, we compute X-ray Fourier time lags using both the XMM-Newton and - through maximum-likelihood methods - NuSTAR data, revealing a strong low-frequency hard lag and evidence for a soft lag at higher frequencies, which we discuss in terms of reverberation models. | URI: | http://hdl.handle.net/20.500.12386/32399 | URL: | https://academic.oup.com/mnras/article/494/4/5056/5820815 http://arxiv.org/abs/2004.03824v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa1008 | Bibcode ADS: | 2020MNRAS.494.5056L | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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