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The story of Seyfert galaxy RE J2248−511: from intriguingly ultrasoft to unremarkably average

Starling, R. L. C ; Done, C ; Jin, C ; Romero-Colmenero, E ; Potter, S. B ; Wiersema, K ; Page, K. L ; Page, M. J ; Breeveld, A. A ; Lobban, A. P

Monthly notices of the Royal Astronomical Society, 2014-02, Vol.437 (4), p.3929-3938 [Periódico revisado por pares]

London: Oxford University Press

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  • Título:
    The story of Seyfert galaxy RE J2248−511: from intriguingly ultrasoft to unremarkably average
  • Autor: Starling, R. L. C ; Done, C ; Jin, C ; Romero-Colmenero, E ; Potter, S. B ; Wiersema, K ; Page, K. L ; Page, M. J ; Breeveld, A. A ; Lobban, A. P
  • Assuntos: Astronomy ; Quasars ; Stars & galaxies ; Ultraviolet radiation ; X-ray astronomy
  • É parte de: Monthly notices of the Royal Astronomical Society, 2014-02, Vol.437 (4), p.3929-3938
  • Descrição: RE J2248−511 is one of only 14 non-blazar active galactic nuclei (AGN) detected in the far-ultraviolet (FUV) by the ROSAT Wide Field Camera implying a large ultrasoft X-ray flux. This soft X-ray excess is strongly variable on year time-scales, a common property of narrow-line Seyfert 1s, yet its optical line widths classify this source as a broad-lined Seyfert 1 (BLS1). We use four nearly simultaneous optical-X-ray spectral energy distributions (SEDs) spanning 7 yr to study the spectral shape and long-term variability of RE J2248−511. Here we show that the continuum SED for the brightest epoch data set is consistent with the mean SED of a standard quasar, and matches well to that from an XMM-Sloan Digital Sky Survey sample of AGN with 〈M/M〉 ∼ 108 and 〈L/L Edd〉 ∼ 0.2. All the correlated optical and soft X-ray variability can be due entirely to a major absorption event. The only remarkable aspect of this AGN is that there is no measurable intrinsic X-ray absorption column in the brightest epoch data set. The observed FUV flux is determined by the combination of this and the fact that the source lies within a local absorption 'hole'. RE J2248−511, whose variable, ultrasoft X-ray flux once challenged its BLS1 classification, demonstrates that characterization of such objects requires multi-epoch, multiwavelength campaigns.
  • Editor: London: Oxford University Press
  • Idioma: Inglês
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