Constraints on the formation of double neutron stars from the observed eccentricities and current limits on merger rates

Understand

We employ population synthesis method to model the double neutron star (DNS) population and test various possibilities on natal kick velocities gained by neutron stars after their formation.

• We first choose natal kicks after standard core collapse SN from a Maxwellian distribution with velocity dispersion of sigma=265 km/s as proposed by Hobbs et al.
• (2005) and then modify this distribution by changing the velocity dispersion towards smaller and larger kick values.
• We also take into account the possibility of NS formation through electron capture supernova.