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Uspekhi Fizicheskikh Nauk, 2019, Volume 189, Number 11, Pages 1240–1248
DOI: https://doi.org/10.3367/UFNr.2019.04.038595 (Mi ufn6520) 		 
This article is cited in 1 scientific paper (total in 1 paper)

CONFERENCES AND SYMPOSIA

On the nature of ultraluminous X-ray sources

S. N. Fabrikaab, K. E. Atapinc, A. S. Vinokurova

a Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Zelenchukskiy region, Karachai-Cherkessian Republic
b Kazan Federal University
c Lomonosov Moscow State University, Sternberg Astronomical Institute
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DOI: https://doi.org/10.3367/UFNr.2019.04.038595
Abstract: Ultraluminous X-ray sources (ULXs) that are located in external galaxies exhibit X-ray luminosities exceeding those of the brightest black holes in the Milky Way and the Local Group galaxies by hundreds or even thousands of times. New classes of objects have been discovered: ultraluminous X-ray pulsars (ULXPs) and high-velocity outflows whose X-ray-range speed is up to $0.2c$. The ULXs and ULXPs fully correspond to concepts of super-Eddington accretion. Five ULXs exhibit quasiperiodic oscillations and a flat-topped noise in the X-ray range power spectrum. Optical spectra of ULXs are very similar to those of SS433, late nitrogen stars (WNL/WR), or LBV (luminous blue variable) stars. The results obtained suggest that ULXs are systems that contain supercritical accretion disks.
Funding agency Grant number
Russian Foundation for Basic Research 19-02-00432
18-32-20214
This research was supported by the Russian Foundation for Basic Research grants 19-02-00432 and 18-32-20214.
Received: June 18, 2019
Accepted: April 3, 2019
English version:
Physics–Uspekhi, 2019, Volume 62, Issue 11, Pages 1162–1169
DOI: https://doi.org/10.3367/UFNe.2019.04.038595
Bibliographic databases:
Document Type: Article
PACS: 97.60.Gb, 97.80.Jp, 98.70.Qy
Language: Russian
Citation: S. N. Fabrika, K. E. Atapin, A. S. Vinokurov, “On the nature of ultraluminous X-ray sources”, UFN, 189:11 (2019), 1240–1248; Phys. Usp., 62:11 (2019), 1162–1169
Citation in format AMSBIB
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