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Formation of Mass-gap Black Holes from Neutron Star X-ray Binaries with Super-Eddington Accretion by Gao, Shi-Jie; Li, Xiang-Dong; Shao, Yong is a scholarly article available to read on EtoBox.

What is Formation of Mass-gap Black Holes from Neutron Star X-ray Binaries with Super-Eddington Accretion about?

Electromagnetic and gravitational wave observations indicate that there is dearth of compact objects with mass $\sim 2.5-5~{\rm M_\odot}$. This so-called "mass gap" may be linked to the supernova explosion mechanisms that produce neutron stars (NSs) and black holes (BHs). However, the existence of a few mass-gap compact objects, some of which have been confirmed to be BHs, poses a challenge to the traditional theory of black hole formation. In this work we investigate the possible formation channel of BHs from accretion-induced collapse (AIC) of NSs in X-ray binaries. In particular, we consider the influence of super-Eddington accretion of NSs. Recent observations of ultraluminous X-ray pulsars suggest that their apparent luminosities may reflect the true accretion luminosities of the accreting NSs, even exceeding the Eddington limit by a factor of $\gtrsim 100$. Thus, NSs accreting at a super-Eddington accretion rate may rapidly grow into BHs in intermediate/low-mass X-ray binaries. Based on the super-Eddington accretion disk models, we have investigated the evolution of NSs in intermediate/low-mass X-ray binaries by combining binary population synthesis and detailed stellar evolu

Author

Gao, Shi-Jie; Li, Xiang-Dong; Shao, Yong

Published

2022

Language

EN