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http://hdl.handle.net/20.500.12386/28412
Titolo: | A rapid occultation event in NGC 3227 | Autori: | Turner, T. J. Reeves, J. N. BRAITO, Valentina Lobban, A. Kraemer, S. Miller, L. |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 481 | Fascicolo: | 2 | Da pagina:: | 2470 | Abstract: | NGC 3227 exhibits rapid flux and spectral variability in the X-ray band. To understand this behaviour, we conducted a coordinated observing campaign using 320 ks of XMM-Newton exposures together with 160 ks of overlapping NuSTAR observations, spanning a month. Here, we present a rapid variability event that occurs toward the end of the campaign. The spectral hardening event is accompanied by a change in the depth of an unresolved transition array (UTA), whose time-dependent behaviour is resolved using the RGS data. This UTA fingerprint allows us to identify this as a transit event, where a clump of gas having N_ H ∼ 5 × 10^{22} {atoms cm^{-2}}, log ξ ∼ 2 occults {∼ } 60{{ per cent}} of the continuum photons over the course of approximately a day. This occulting gas is likely associated with clouds in the inner broad-line region. An additional zone of gas with lower column and higher ionization, matches the outflow velocity of the variable zone, and may represent transmission through the cloud limb. | URI: | http://hdl.handle.net/20.500.12386/28412 | URL: | https://academic.oup.com/mnras/article/481/2/2470/5091829 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty2447 | Bibcode ADS: | 2018MNRAS.481.2470T | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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