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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/20.500.12386/28819
Title: On the magnetic field in M51 ULX-8
Authors: Middleton, M. J.
Brightman, M.
Pintore, Fabio 
BACHETTI, Matteo 
Fabian, A. C.
Fürst, F.
Walton, D. J.
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 486
Issue: 1
First Page: 2
Abstract: The reported discovery of a cyclotron resonance scattering feature (CRSF) in the spectrum of M51 ULX-8 may provide an important clue as to the nature of the magnetic field in those ultraluminous X-ray sources hosting neutron stars. In this paper, we present the covariance (linearly correlated variability) spectrum of M51 ULX-8 on long (>2000 s) time-scales. This allows us to unambiguously decompose the spectrum which requires multiple components in order to explain the broadband emission. Having a clearer picture of the spectral decomposition leads to various tests for the dipole field strength of the neutron star which can be extended to other ULXs when certain criteria are met. In the case of M51 ULX-8, we rule out a very strong (10<SUP>15</SUP> G) dipole solution with either a sub- or supercritical disc. Instead, our tests indicate an upper limit on the dipole field of 10<SUP>12</SUP> G and a classical supercritical inflow, similar to that inferred in other ULXs found to harbour neutron stars, although we do not rule out the presence of an additional, strong (10<SUP>15</SUP> G) multipole field falling off steeply with distance from the neutron star.
URI: http://hdl.handle.net/20.500.12386/28819
URL: https://academic.oup.com/mnras/article/486/1/2/5342083
ISSN: 0035-8711
DOI: 10.1093/mnras/stz436
Bibcode ADS: 2019MNRAS.486....2M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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