Detection Prospects of Fast-merging Gravitational Wave Sources in M31

Understand

It is widely accepted that quite a number of double compact objects (DCOs) in the Milky Way can be identified by future space-based gravitational wave (GW) detectors, while systematic investigations on the detection of the GW sources in nearby galaxies are still lacking.

• In this paper, we present calculations of potential populations of GW sources for all types of DCOs in the Local Group galaxy M31.
• For M31, we use an age-dependent model for the evolution of the metallicity and the star-formation rate.
• By varying assumptions of common-envelope ejection efficiencies and supernova-explosion mechanisms during binary evolution, we make predictions on the properties of DCOs that can be detected by the Laser Interferometer Space Antenna (LISA).