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.
Professor Christine Done email@example.com
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/LEdd〉 ∼ 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.
Starling, R., Done, C., Jin, C., Romero-Colmenero, E., Potter, S., Wiersema, K., …Lobban, A. (2014). The story of Seyfert galaxy RE J2248-511: from intriguingly ultrasoft to unremarkably average. Monthly Notices of the Royal Astronomical Society, 437(4), 3929-3938. https://doi.org/10.1093/mnras/stt2201
|Journal Article Type||Article|
|Acceptance Date||Nov 9, 2013|
|Online Publication Date||Dec 6, 2013|
|Publication Date||Feb 1, 2014|
|Deposit Date||Mar 16, 2016|
|Publicly Available Date||Mar 18, 2016|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
|Related Public URLs||http://adsabs.harvard.edu/abs/2014MNRAS.437.3929S|
Published Journal Article
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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