Constraints on Population I/II neutron star-black hole binary formation by gravitational wave and radio observations

Abstract

Two neutron star (NS)-black hole (BH) binaries, GW200105 and GW200115 found in the LIGO/Virgo O3b run have smaller BH mass of 6--9\,$M_{\odot }$ which is consistent with Population I and II origin. Our population synthesis simulations using $10^6$ Population I and II binaries with appropriate initial parameters show consistent binary mass, event rate, and no detection of radio pulsar (PSR) and BH binaries in our galaxy so far. Especially, we found possible progenitors of GW200105 and GW200115 which were formed at redshift $z=0.15$ and $z=1.6$ with binary mass of $(34M_{\odot },9.2M_{\odot })$ and $(23.7M_{\odot },10.6M_{\odot })$, respectively. The final masses of these binaries are $(6.85M_{\odot },2.14M_{\odot })$ and $(6.04M_{\odot },1.31M_{\odot })$ which look like $(9.0_{-1.7}^{+1.7}{M}_{\odot },1.91_{-0.24}^{+0.33}{M}_{\odot })$ of GW200105 and $(5.9_{-2.5}^{+2.0}{M}_{\odot },1.44_{-0.29}^{+0.85}{M}_{\odot })$ of GW200115, respectively. We also estimate that 2.68-19.7 PSR-BH binaries in our galaxy will be observed by SKA. The existence of NS-BHs in our galaxy can be confirmed in future SKA era. Using the GW observation of NS-BH mergers and the radio observation of PSR-BHs in future, we can get more severe constraints on the NS-BH formation process.

Comments welcome. Accepted for publication of MNRAS Letter

References in corpus (19)

• Cosmic Star Formation History
• Laser Interferometer Space Antenna
• Observation of gravitational waves from two neutron star-black hole coalescences
• The Galaxy Mass Function up to z=4 in the GOODS-MUSIC sample: into the epoch of formation of massive galaxies
• The observed velocity distribution of young pulsars
• GWTC-2.1: Deep Extended Catalog of Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• The Mass Distribution of Neutron Stars in Gravitational-wave Binaries
• Modelling Neutron Star-Black Hole Binaries: Future Pulsar Surveys and Gravitational Wave Detectors
• GW200115: a non-spinning black hole -- neutron star merger
• Impact of natal kicks on merger rates and spin-orbit misalignments of black hole -- neutron star mergers
• The Salpeter IMF and its descendants
• GW200105 and GW200115 are compatible with a scenario of primordial black hole binary coalescences
• Scope out multiband gravitational-wave observations of GW190521-like binary black holes with space gravitational wave antenna B-DECIGO
• Population properties of neutron stars in the coalescing compact binaries
• On the large apparent black hole spin-orbit misalignment angle in GW200115
• Formation of the First Two Black Hole-Neutron Star Mergers (GW200115 and GW200105) from Isolated Binary Evolution
• Population Synthesis of Black Hole Binaries with Compact Star Companions
• Science with SKA
• Insights into the Milky Way pulsar--black hole population using radio and gravitational wave observations

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