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Investigation of the Ultraluminous X-ray Source VII Zw 403 ULX in the X-ray and Optical Ranges

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Abstract

We present the results of our analysis of the series of X-ray observations, photometric and spectroscopic monitoring for the ultraluminous X-ray source VII Zw 403 ULX (UGC 6456 ULX). Based on a number of indirect signs, we hypothesize that the accretor in this binary system is a neutron star. By analyzing the observed spectrum of this ULX taken during its active state within the framework of the model of a wind coming from the supercritical accretion disk, we have estimated the mass outflow rate to be \({\approx}4.0\times 10^{-5}M_{\odot}\) yr\({}^{-1}\).

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Fig. 1
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Notes

  1. We deemed that the source was not detected if fewer than four photons fell within the object’s aperture during the whole observation.

  2. Because of the relatively small effective Swift/XRT collecting area, it was possible to measure only the upper luminosity limit for most of the observations corresponding to the object’s low state.

  3. Depending on the relation between the magnetic field strength and the accretion rate namely, when the condition \(R_{\textrm{sp}}\) > \(R_{m}\) is met (Grebenev 2017; Walton et al. 2018b), where \(R_{\textrm{sp}}\) is the spherization radius determined by the total mass inflow rate into the disk \(\dot{M}_{0}\) and \(R_{m}\) is the magnetospheric radius dependent on both magnetic moment \(\mu\) and rate \(\dot{M}(R_{m})\), the disk can have a supercritical region. A key feature of this region is the presence of intense mass outflows (Poutanen et al. 2007; Chashkina et al. 2019) that are probably responsible for the formation of emission lines in the optical spectra for a number of objects (Fabrika et al. 2015).

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ACKNOWLEDGMENTS

Part of the observational data was obtained at the unique scientific facility ‘‘Large Alt-Azimuthal Telescope’’ of SAO RAS.

Funding

This work was supported by grant no. 075-15-2022-262 of the Ministry of Science and Higher Education of the Russian Federation (13.MNPMU.21.0003).

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia

    A. S. Vinokurov, A. E. Kostenkov & Yu. N. Solovyeva

  2. Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia

    K. E. Atapin

Authors
  1. A. S. Vinokurov
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  2. K. E. Atapin
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  3. A. E. Kostenkov
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  4. Yu. N. Solovyeva
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Correspondence to A. S. Vinokurov.

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Translated by V. Astakhov

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Vinokurov, A.S., Atapin, K.E., Kostenkov, A.E. et al. Investigation of the Ultraluminous X-ray Source VII Zw 403 ULX in the X-ray and Optical Ranges. Astron. Lett. 49, 787–795 (2023). https://doi.org/10.1134/S1063773723120083

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