# Cyg X-3: a low-mass black hole or a neutron star.

@article{Zdziarski2013CygXA,
title={Cyg X-3: a low-mass black hole or a neutron star.},
author={Andrzej A. Zdziarski and Joanna Mikołajewska and Krzysztof Belczynski},
journal={Monthly Notices of the Royal Astronomical Society},
year={2013},
volume={429}
}
• Published 27 August 2012
• Physics
• Monthly Notices of the Royal Astronomical Society
Cyg X-3 is a highly interesting accreting X-ray binary, emitting from the radio to high-energy gamma-rays. It consists of a compact object wind-fed by a Wolf-Rayet (WR) star, but the masses of the components and the mass-loss rate have been a subject of controversies. Here, we determine its masses, inclination, and the mass-loss rate using our derived relationship between the mass-loss rate and the mass for WR stars of the WN type, published infrared and X-ray data, and a relation between the…

## Figures from this paper

### Near-IR and X-Ray Variability of Cyg X-3: Evidence for a Compact IR Source and Complex Wind Structures

• Physics
The Astrophysical Journal
• 2022
We study near-infrared (JHK) and X-ray light curves of Cyg X-3 obtained with the 2.5 m telescope of the Caucasian Mountain Observatory of MSU SAI and collected from the RXTE ASM and MAXI archives.

### Spectroscopic modelling of two high-mass X-ray binaries, Cyg X–3 and 4U 1538–522

• Physics
Monthly Notices of the Royal Astronomical Society
• 2021
We report a detailed modelling of soft X-ray emission lines from two stellar wind-fed Galactic high-mass X-ray binary (HMXB) systems, Cyg X-3 and 4U 1538-522, and estimate physical parameters, e.g.

### Revisiting the dynamical case for a massive black hole in IC10 X-1

• Physics
• 2015
The relative phasing of the X-ray eclipse ephemeris and optical radial velocity (RV) curve for the X-ray binary IC10 X-1 suggests the He[$\lambda$4686] emission-line originates in a shadowed sector

### Wind suppression by X-rays in Cygnus X-3

• Physics
Astronomy & Astrophysics
• 2021
Context. The radiatively driven wind of the primary star in wind-fed X-ray binaries can be suppressed by the X-ray irradiation of the compact secondary star. This causes feedback between the wind and

### CYG X-3: A GALACTIC DOUBLE BLACK HOLE OR BLACK-HOLE–NEUTRON-STAR PROGENITOR

• Physics
• 2013
There are no known stellar-origin double black hole (BH–BH) or black-hole–neutron-star (BH–NS) systems. We argue that Cyg X-3 is a very likely BH–BH or BH-NS progenitor. This Galactic X-ray binary

### The radio/X-ray correlation in Cyg X-3 and the nature of its hard spectral state

• Physics
• 2016
We study the radio/X-ray correlation in Cyg X-3. It has been known that the soft and hard X-ray fluxes in the hard spectral state are correlated positively and negatively, respectively, with the

### The binary systems IC 10 X-1 and NGC 300 X-1: Accretion of matter from an intense Wolf–Rayet stellar wind onto a black hole

• Physics
• 2016
The current evolutionary stage of the binary systems IC 10 X-1 and NGC 300 X-1, which contain a massive black hole and a Wolf–Rayet star with a strong stellar wind that does not fill its Roche lobe,

### Chandra and XMM monitoring of the black hole X-ray binary IC 10 X-1

• Physics
• 2015
The massive black hole + Wolf-Rayet binary IC10 X-1 was observed in a series of 10 Chandra and 2 XMM-Newton observations spanning 2003-2012, showing consistent variability around 7 x10^37 erg/s, with

### Discovery of a 6.4 h black hole binary in NGC 4490

• Physics
• 2013
ABSTRACT We report on the discovery with Chandra of a strong modulation ( ˘ 90% pulsed fraction)at ˘ 6.4 hr from the source CXOUJ123030.3+413853 in the star-forming, low-metallicityspiral galaxy

### Gemini/GNIRS infrared spectroscopy of the Wolf–Rayet stellar wind in Cygnus X-3

• Physics
• 2017
The microquasar Cygnus X-3 was observed several times with the Gemini North Infrared Spectrograph while the source was in the hard X-ray state. We describe the observed 1.0-2.4 $\mu$m spectra as

## References

SHOWING 1-10 OF 45 REFERENCES

### Cygnus X-3 and the problem of the missing Wolf-Rayet X-ray binaries

• Physics
• 2005
Cygnus X-3 is a strong X-ray source (LX ≈ 10 38 erg s −1 ) which is thought to consist of a compact object accreting matter from a helium star. We analytically find that the estimated ranges of

### The nature of Cygnus X-3: a prototype for old population binary x-ray sources

• Physics
• 1974
Description of a model for Cyg X-3 based on a short-lived phase in the evolution of a U Geminorum-type binary where rapid mass transfer and mass loss occurs. X rays are generated by accretion on the

### Cygnus X-3 with ISO: investigating the wind

• Physics
• 2000
We observed the energetic binary Cygnus X-3 in both quiescent and flaring states between 4 and 16 microns using the ISO satellite. We find that the quiescent source shows the thermal free-free

### Infrared helium emission lines from Cygnus X-3 suggesting a Wolf-Rayet star companion

• Physics
Nature
• 1992
CYGNUS X-3 is one of the most luminous X-ray sources in the Galaxy1,2, a bright infrared source3 and a radio source that undergoes huge outbursts4. The system is a binary, presumably a neutron star

### Orbital modulation of X-ray emission lines in Cygnus X-3

• Physics
• 2009
Aims. We address the problem where the X-ray emission lines are formed and investigate orbital dynamics using Chandra HETG observations, photoionizing calculations and numerical wind-particle

### CYG X-3: A GALACTIC DOUBLE BLACK HOLE OR BLACK-HOLE–NEUTRON-STAR PROGENITOR

• Physics
• 2013
There are no known stellar-origin double black hole (BH–BH) or black-hole–neutron-star (BH–NS) systems. We argue that Cyg X-3 is a very likely BH–BH or BH-NS progenitor. This Galactic X-ray binary

### Effects of the stellar wind on X-ray spectra of Cygnus X-3

• Physics
• 2008
We study X-ray spectra of Cyg X-3 from BeppoSAX, taking into account absorption and emission in the strong stellar wind of its companion. We find the intrinsic X-ray spectra are well modelled by disc

### Jets in neutron star X-ray binaries: a comparison with black holes

• Physics
• 2005
We present a comprehensive study of the relation between radio and X-ray emission in neutron star (NS) X-ray binaries, use this to infer the general properties of the disc‐jet coupling in such

### A universal radio-X-ray correlation in low/hard state black hole binaries

• Physics
• 2003
Several independent lines of evidence now point to a connection between the physical processes that govern radio (i.e. jet) and X-ray emission from accreting X-ray binaries. We present a

### Extreme particle acceleration in the microquasar Cygnus X-3

• Physics
Nature
• 2009
There is a clear pattern of temporal correlations between the γ-ray flares and transitional spectral states of the radio-frequency and X-ray emission, and particle acceleration occurred a few days before radio-jet ejections for two of the four flares, meaning that the process of jet formation implies the production of very energetic particles.