Population Synthesis of Ultraluminous X-ray Sources with Magnetized Neutron Stars

被引:11
作者
Kuranov, A. G. [1 ]
Postnov, K. A. [1 ,2 ,3 ]
Yungelson, L. R. [4 ]
机构
[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Univ Skii Pr 13, Moscow 119234, Russia
[2] Alikhanov Inst Theoret & Expt Phys, Ul Bolshaya Cheremushkinskaya 25, Moscow 117218, Russia
[3] Kazan Fed Univ, Ul Kremlevskaya 18, Kazan 420008, Russia
[4] Russian Acad Sci, Inst Astron, Ul Pyatnitskaya 48, Moscow 119017, Russia
来源
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2020年 / 46卷 / 10期
基金
俄罗斯基础研究基金会;
关键词
ultraluminous X-ray sources; neutron stars; population synthesis; SUPER-EDDINGTON ACCRETION; COMMON ENVELOPE; WHITE-DWARFS; SMC X-3; PULSAR; EVOLUTION; DISCOVERY; LUMINOSITY; BINARIES; PERIOD;
D O I
10.1134/S1063773720100084
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A model of a population of ultraluminous X-ray sources with magnetized neutron stars (NULXs) in a spiral galaxy with a star formation history as in the thin disk of theMilkyWay is constructed by the hybrid population synthesis method. First, based on analytical approximations (BSE code), we compute a set of close binary systems (CBSs), potential precursors of NULXs, and, then, the evolution with mass accretion onto magnetized neutron stars (NSs) is computed by the MESA evolutionary code. The accretion rate onto NSs and the X-ray luminosity of sources are calculated for the models of sub- or supercritical disks and disks with advection. During accretion onto magnetized NSs, super-Eddington luminosities L-X > 10(38) erg s(-1) are reached already at the subcritical stage, when the energy release at the inner boundary of the disk defined by the NS magnetosphere is sub-Eddington one. Our calculations show that the standard evolution of CBSs, given the peculiarities of accretion onto magnetized NSs, allows the observed properties of NULXs (X-ray luminosities, NS spin periods, CBS orbital periods, and optical component masses) to be quantitatively explained without requiring additional model assumptions about the collimation of X-ray emission from NSs with a high observed super-Eddington luminosity. In a model galaxy with a star formation rate similar to 5 M-circle dot yr(-1) there can be several NULXs. The detection of a powerful wind from NULXs with L-X similar to 10(41) erg s(-1) may suggest supercritical accretion onto magnetized NSs.
引用
收藏
页码:658 / 676
页数:19
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