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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The story of Seyfert galaxy RE J2248-511: From intriguingly ultrasoft to unremarkably average
Monthly Notices of the Royal Astronomical Society, Volume 437, No. 4, Year 2014
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Description
RE J2248-511 is one of only 14 non-blazar active galactic nuclei (AGN) detected in the farultraviolet (FUV) by the ROSATWide 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. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Starling, Rhaana L.C.
United Kingdom, Leicester
University of Leicester
Done, Chris
United Kingdom, Durham
Durham University
Jin, Chichuan
United Kingdom, Durham
Durham University
Romero-Colmenero, Encarnacion
South Africa, Cape Town
South African Astronomical Observatory
Potter, Stephen B.
South Africa, Cape Town
South African Astronomical Observatory
Wiersema, Klaas
United Kingdom, Leicester
University of Leicester
Page, Kim L.
United Kingdom, Leicester
University of Leicester
Page, Mathew J.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Breeveld, A. A.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Lobban, A. P.
United Kingdom, Leicester
University of Leicester
Statistics
Citations: 10
Authors: 10
Affiliations: 4
Identifiers
Doi:
10.1093/mnras/stt2201
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative