SIMBAD references

2020MNRAS.491.4949V - Mon. Not. R. Astron. Soc., 491, 4949-4959 (2020/February-1)

M51 ULX-7: superorbital periodicity and constraints on the neutron star magnetic field.


Abstract (from CDS):

In this work, we explore the applicability of standard theoretical models of accretion to the observed properties of M51 ULX-7. The spin-up rate and observed X-ray luminosity are evidence of a neutron star with a surface magnetic field of 2-7 x 1013 G, rotating near equilibrium. Analysis of the X-ray light curve of the system (Swift/XRT data) reveals the presence of a ∼39 d superorbital period. We argue that the superorbital periodicity is due to disc precession, and that material is accreted on to the neutron star at a constant rate throughout it. Moreover, by attributing this modulation to the free precession of the neutron star we estimate a surface magnetic field strength of 3-4 x 1013 G. The agreement of these two independent estimates provide strong constraints on the surface polar magnetic field strength of the NS.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: neutron - pulsars: individual: M51 ULX-7 - galaxies: individual: M51 - X-rays: binaries

Simbad objects: 15

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