Subjects: Astronomy submitted time 2024-01-05 Cooperative journals: 《天文学进展》
Abstract： Since the first detection of GW150914, a larger amount of stellar binary black hole (sBBH) mergers have been detected by LIGO/Virgo collaboration with high confidence. By analyzing the gravitational wave (GW) signals, one can obtain crucial physical properties of these sBBH mergers, including their chirp mass, spin, and luminosity distance, etc. The origin of sBBHs may encode in the distribution of these physical properties. Here, the curent status of the study on sBBHs spins is reviewed. First, various formation mechanisms of sBBHs are briefly introduced, and these mechanisms include: 1) sBBHs are formed via the evolution of massive binary stars (EMBS channel); 2) sBBHs are formed via the dynamical interactions with surrounding (compact) stars in dense stellar clusters (dynamical channel); etc. The origin of spins for sBBHs originated from the black hole formation processes is also introduced. One may expect that the spin distributions resulting from different sBBH formation channels are different. For example, the two components of each sBBH resulting from the EMBS channel have spins more or less aligned with each other, while they may be randomly distributed if the sBBH is resulting from the dynamical channel. Therefore, the spin distribution obtained from GW observations may be used to distinguish the EMBS channel from the dynamical channel and further reveal the origin of sBBHs. The general methods for constraining the origin of sBBHs via their spin distribution are then introduced. The results obtained by recent works using the GW observations of sBBHs (GWTC) are summarized. Finally, a summary and a short prospect are given for the future demography study of the sBBH spins measured by next generation ground-based GW detectors.
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