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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31591
Title: NuSTAR reveals the hidden nature of SS433
Authors: Middleton, M. J.
Walton, D. J.
Alston, W.
Dauser, T.
Eikenberry, S.
Jiang, Y. -F.
Fabian, A. C.
Fuerst, F.
Brightman, M.
Marshall, H.
Parker, M.
PINTO, CIRO 
Harrison, F. A.
BACHETTI, Matteo 
Altamirano, D.
Bird, A. J.
Perez, G.
Miller-Jones, J.
Charles, P.
Boggs, S.
Christensen, F.
Craig, W.
Forster, K.
Grefenstette, B.
Hailey, C.
Madsen, K.
Stern, D.
Zhang, W.
Issue Date: 2021
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 506
Issue: 1
First Page: 1045
Abstract: SS433 is the only Galactic binary system known to persistently accrete at highly super-critical (or hyper-critical) rates, similar to those in tidal disruption events, and likely needed to explain the rapid growth of those very high redshift quasars containing massive SMBHs. Probing the inner regions of SS433 in the X-rays is crucial to understanding this system, and super-critical accretion in general, but is highly challenging due to obscuration by the surrounding wind, driven from the accretion flow. NuSTAR observed SS433 in the hard X-ray band across multiple phases of its 162 d superorbital precession period. Spectral-timing tools allow us to infer that the hard X-ray emission from the inner regions is likely being scattered towards us by the walls of the wind-cone. By comparing to numerical models, we determine an intrinsic X-ray luminosity of ≥ 2 × 10<SUP>37</SUP> erg s<SUP>-1</SUP> and that, if viewed face on, we would infer an apparent luminosity of >1 × 10<SUP>39</SUP> erg s<SUP>-1</SUP>, confirming SS433's long-suspected nature as an ultraluminous X-ray source (ULX). We present the discovery of a narrow, ~100 s lag due to atomic processes occurring in outflowing material travelling at least 0.14-0.29c, which matches absorption lines seen in ULXs and - in the future - will allow us to map a super-critical outflow for the first time.
URI: http://hdl.handle.net/20.500.12386/31591
URL: https://academic.oup.com/mnras/article/506/1/1045/6270899?login=true
http://arxiv.org/abs/1810.10518v3
ISSN: 0035-8711
DOI: 10.1093/mnras/stab1280
Bibcode ADS: 2021MNRAS.506.1045M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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