Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12666/299
Title: | The first broad-band X-ray view of the narrow-line Seyfert 1 Ton S180 |
Authors: | Matzeu, G. A. Nardini, E. Parker, M. L. Reeves, J. N. Braito, V. Porquet, D. Middei, R. Kammoun, E. Lusso, E. Alston, W. N. Giustini, M. Lobban, A. P. Joyce, A. M. Igo, Z. Ebrero, J. Ballo, L. Santos Lleó, M. Schartel, N. |
Keywords: | Black hole physics;Galaxies: active;Galaxies: individual: Ton S180;Galaxies: nuclei;X rays: galaxies |
Issue Date: | 15-Jul-2020 |
Publisher: | Oxford Academics: Oxford University Press |
DOI: | 10.1093/mnras/staa2076 |
Published version: | https://academic.oup.com/mnras/article-abstract/497/2/2352/5871831 |
Citation: | Monthly Notices of the Royal Astronomical Society 497(2): 2352–2370(2020) |
Abstract: | We present joint XMM-Newton and NuSTAR observations of the 'bare' narrow-line Seyfert 1 Ton S180 (z = 0.062), carried out in 2016 and providing the first hardX-ray view of this luminous galaxy. We find that the 0.4-30 keV band cannot be self-consistently reproduced by relativistic reflection models, which fail to account simultaneously for the soft and hard X-ray emission. The smooth soft excess prefers extreme blurring parameters, confirmed by the nearly featureless nature of the Reflection Grating Spectrometer (RGS) spectrum, while the moderately broad Fe K line and the modest hard excess above 10 keV appear to arise in a milder gravity regime. By allowing a different origin of the soft excess, the broad-band X-ray spectrum and overall spectral energy distribution (SED) are well explained by a combination of (a) direct thermal emission from the accretion disc, dominating from the optical to the far/extreme UV; (b) Comptonization of seed disc photons by a warm (kT(e) similar to 0.3 keV) and optically thick (tau similar to 10) corona, mostly contributing to the soft X-rays; (c) Comptonization by a standard hot (kT(e) greater than or similar to 100 keV) and optically thin (tau < 0.5) corona, responsible for the primary X-ray continuum; and (d) reflection from the mid/outer part of the disc. The two coronae are suggested to be rather compact, with R-hot less than or similar to R-warm less than or similar to 10 r(g). Our SED analysis implies that Ton S180 accretes at super-Eddington rates. This is a key condition for the launch of a wind, marginal (i.e. 3.1 sigma significance) evidence of which is indeed found in the RGS spectrum. |
URI: | http://hdl.handle.net/20.500.12666/299 |
E-ISSN: | 1365-2966 |
ISSN: | 0035-8711 |
Appears in Collections: | (CAB) Artículos |
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