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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28419
Title: On the Nature of the High-Energy Rollover in 1H 0419-577
Authors: Turner, T. J.
Reeves, J. N.
Braito, V. 
Costa, M.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 476
Issue: 1
First Page: 1258
Abstract: A NuSTAR/Swift observation of the luminous Seyfert 1 galaxy 1H 0419-577 taken during 2015 reveals one of the most extreme high energy cut-offs observed to date from an AGN - an origin due to thermal Comptonization would imply a remarkably low coronal temperature $kT \sim 15$ keV. The low energy peak of the spectrum in the hard X-ray NuSTAR band, which peaks before the expected onset of a Compton hump, rules out strong reflection as the origin of the hard excess in this AGN. We show the origin of the high energy rollover is likely due to a combination of both thermal Comptonization and an intrinsically steeper continuum, which is modified by absorption at lower energies. Furthermore, modeling the broadband XUV continuum shape as a colour-corrected accretion disc, requires the presence of a variable warm absorber to explain all flux and spectral states of the source, consistent with the previous work on this AGN. While absorber variations produce marked spectral variability in this AGN, consideration of all flux states allows us to isolate a colourless component of variability that may arise from changes in the inner accretion flow, typically at around $10 \, r_g$.
URI: http://hdl.handle.net/20.500.12386/28419
URL: http://arxiv.org/abs/1802.00795v1
https://academic.oup.com/mnras/article/476/1/1258/4848282
ISSN: 0035-8711
DOI: 10.1093/mnras/sty318
Bibcode ADS: 2018MNRAS.476.1258T
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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