Revising Natal Kick Prescriptions in Population Synthesis Simulations

被引：83

作者：

Giacobbo, Nicola ^{[1
,2
,3
]}

Mapelli, Michela ^{[1
,2
,3
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron G Galilei, Vicolo Osservatorio 3, I-35122 Padua, PD, Italy

[2] INAF, Osservatorio Astronom Padova, Vicolo Osservatorio 5, I-35122 Padua, PD, Italy

[3] INFN, Sez Padova, Via Marzolo 8, I-35131 Padua, PD, Italy

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 891卷 / 02期

基金：

欧洲研究理事会;

关键词：

BLACK-HOLE BINARIES; NEUTRINO-DRIVEN EXPLOSIONS; COMPACT OBJECT FORMATION; YOUNG STAR-CLUSTERS; COSMIC MERGER RATE; X-RAY BINARIES; DIFFERENT METALLICITIES; COMMON-ENVELOPE; MULTIDIMENSIONAL SIMULATIONS; VELOCITY DISTRIBUTION;

D O I：

10.3847/1538-4357/ab7335

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Natal kicks are a matter of debate and they significantly affect the merger rate density of compact objects. Here, we present a new simple formalism for natal kicks of neutron stars (NSs) and black holes (BHs). We describe the magnitude of the kick as nu kick alpha f(H05) m(ej) m(rem)(1), where f(H05) is a normalization factor, drawn from a Maxwellian distribution with one-dimensional rms velocity sigma = 265 km s(-1), m(ej) is m(rem) the mass of the supernova (SN) ejecta, and mrem is the mass of the compact object. This formalism matches the proper motions of young Galactic pulsars and can naturally account for the differences between core-collapse SNe of single stars, electron-capture SNe and ultrastripped SNe occurring in interacting binaries. Finally, we use our new kick formalism to estimate the local merger rate density of binary NSs (R-BNS), BH-NS binaries (R-BHNS), and binary BHs (R-BBH), based on the cosmic star formation rate density and metallicity evolution. In our fiducial model, we find R-BNS similar to 600 Gpc(-3)yr(-1), R-BHNS similar to 10 Gpc(-3)yr(-1), and R-BBH similar to 50 Gpc(-3) yr(-1), fairly consistent with the numbers inferred from the LIGO-Virgo collaboration.

引用

页数：9

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