Population Synthesis for Symbiotic X-ray Binaries

Abstract

Symbiotic X-ray binaries (SyXBs) comprise a rare class of low-mass X-ray binaries. We study the Galactic SyXBs, which we consider as detached binaries composed of low-mass giants and wind-fed neutron star companions, by simulation of the interaction of a magnetized neutron star (NS) with its environment and utilizing a population synthesis code. We focus mainly on the parameters that influence observational appearance of the SyXB: the donor wind velocity (vw) and the angular momentum distribution in the shell of matter settling onto NS. We estimate the birthrate of SyXB as $\sim 4.1\times 10^{-5}$ yr${}^{-1}$ to $\sim 6.6\times 10^{-6}$ yr${}^{-1}$ and their number in the Galaxy as $\sim$(100 -- 1000). Assumed stellar wind velocity from cool giants is the input parameter that influences the model SyXBs population most. Among known SyXBs or candidate systems, 4U 1954+31 and IGR J16358-4724 in which NS have very long spin periods may host quasi-spherically accreting NSs. GX 1+4 has a peculiar long-term spin behaviour and it may also be a quasi-spherical wind-accreting source. We cannot identify whether there are wind-fed accretion disks in 4U 1700+24, Sct X-1, IRXS J180431.1-273932 and 2XMM J174016.0-290337.

12 pages, 6 figures, 3 tables (accepted for publication in MNRAS)

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• Formation and Evolution of Accreting Compact Objects
• Discovery of radio emission from the symbiotic X-ray binary system GX 1+4
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• The population synthesis of Wolf-Rayet stars involving binary merger channels
• The Symbiotic X-ray binaries Sct X-1, 4U 1700+24 and IGR J17329-2731
• RAMSES II - RAMan Search for Extragalactic Symbiotic Stars. Project concept, commissioning, and early results from the science verification phase
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• Suzaku Observation of the Symbiotic X-Ray Binary IGR J16194-2810
• Sample of optically unidentified X-ray binaries in the Galactic bulge. Constraints on the physical nature from infrared photometric surveys
• A massive AGB donor in Scutum X-1: Identification of the first Mira variable in an X-ray binary
• The puzzling symbiotic X-ray system 4U1700+24
• 3xmm j181923.7$-$170616: an x-ray binary with a 408s pulsar
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• X-ray binaries with neutron stars at different accretion stages
• Quark Novae: An Alternative Channel For the Formation of Isolated Millisecond Pulsars
• The X-ray binaries in M83: will any of them form gravitational wave sources for LIGO/VIRGO/KAGRA?
• Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter