Dataset from the paper "Eccentric black hole mergers via three-body interactions in young, globular and nuclear star clusters"

This repository contains several data from the paper "Eccentric black hole mergers via three-body interactions in young, globular and nuclear star clusters".

BBH_mergers_cat_*.dat contains the data for the BBH merger population produced by the three-body simulations. These data can be used to reproduce figures 4,5, and 8 of the paper. The file is organized in columns as:

• ID of the simulation.
• outcome of the simulation (12, merger triggered by a flyby event, 13 and 23 merger triggered after an exchange event in which the secondary (primary) BH is replaced by the intruder, 123 second generation BBH merger.
• mass of the primary BH in solar masses
• mass of the secondary BH in solar masses
• Chirp mass of the system in solar masses
• coalescence time since the beginning of the simulation in year (note that all the simulation with tcoal<1e5 yr have merged during the direct N-body simulation, while all the mergers that take place after this value are evolved with the equations by Peters 1964)
• eccentricity of the binary at 10 Hz in the detector frame
• tilt angle in radiant, defined as the angle between the orbital plane of the initial binary at the beginning of the simulation and the orbital plane of the final binary at the end of the simulation.

The files named data_*.txt contains the masses, the position and the velocities at each timestep for the three simulations showed in fig.1 in the paper. The data are referred to the center-of-mass of the three-body system. The file is organized as follows:

• The first line of the file reports the masses in solar masses of the three BHs.
• Column 0 reports the time in yr
• Colum 1-3 report the x,y,z position for the m1 BH in parsec
• Colum 4-6 report the x,y,z position for the m2 BH in parsec
• Colum 7-9 report the x,y,z position for the m3 BH in parsec
• Colum 10-12 report the x,y,z components of the velocities of the m1 BH in km/s
• Colum 13-15 report the x,y,z components of the velocities of the m1 BH in km/s
• Colum 16-18 report the x,y,z components of the velocities of the m1 BH in km/s

Finally, outcomes_*.dat contains two columns:

• Column 0 reports the ID of the simulation
• Column 1 reports the outcome of the simulation as: 12 flyby (or merger after a flyby), 13 and 23 exchange (or merger after an exchange) in which the secondary (primary) BH is replaced by the intruder, 0 in the system is ionized in three single BHs, 3 if the system is still interacting at 1Myr, i.e. when we stop our simulation.

This file might be useful to train a machine-lerning classificator, and can be used to reproduce Fig. 2 of the paper.

Contacts:

Marco Dall'Amico

marco.dallamico@phd.studenti.unipd.it

marco.dallamico@pd.infn.it