Synthetic Universe

Syntetic catalog of black holes in the Milky Way



Aleksandra Olejak: a.olejak@student.uw.edu.pl, aleksandra.olejak@wp.pl
Chris Belczynski: chrisbelczynski@gmail.com

1. Introduction

We present an open access database that includes a synthetic catalog of black holes in the Milky Way. For the method description see: https://arxiv.org/abs/1908.08775 .

2. Database files description

Single black holes

There are five files with single black holes of three Galactic component (disk, halo and bulge) denepding on their formation channel. The file names are marked as follows (with disk as an exaple component):
Disk_single_stars.dat - these are black holes that have been formed in evolution of massive single star
Disk_single_dis_sys_model_A.dat - this is BHs from disrupted binary systems (model A)
Disk_single_dis_sys_model_B.dat - this is BHs from disrupted binary systems (model B)
Disk_single_mergers_model_A.dat - this is BHs originated from merger of binary system (model A)
Disk_single_mergers_model_B.dat - this is BHs originated from merger of binary system (model B)


Files format for single BHs:
Object type, Mass [Msun], Tevol [Myr], Vkickx[km / s], Vkicky [km / s], Vkickz [km / s], X [kpc], Y [kpc], Z [kpc], Vgalx [km / s], Vgaly [km / s ], Vgalz [km / s]

Object type - according to StarTracek types (e.g. Belczynski 2008), for single BH only 14 (BH)
Vkickx, Vkicky, Vkickz - it's the velocity component of a BH associated only with stellar evolution (kicks). The motion in Galactic potential is not included.
X, Y, Z - BH coordinates in the Galaxy
Vgalx, Vgaly, Vgalz - these are total velocities of BHs, which are sum of the motion in Galactic potential and stellar evolution component.
Tevol - time since object formation

Black holes in binary systems

Disk_binaries_A.dat - binary systems with BH, model A
Disk_binaries_B.dat - binary systems with BH, model B

File format for BHs in binary sytems:
Object type 1, Object type 2, Mass1 [Msun] Mass2 [Msun], a [Rsun], e, Tevol [Myr], Vkickx [km / s], Vkicky [km / s], Vkickz [km / s], X [kpc], Y [kpc], Z [kpc], Vgalx [km / s], Vgaly [km / s], Vgalz [km / s]

Possible object types:
0 – main sequence star with M<=0.7 Msun (deeply or fully convective)
1 – main sequence star with M>0.7 Msun
2 – Hertzsprung gap star
3 – first giant branch star
4 – core helium burning star
5 – early asymptotic giant branch star
6 – thermally pulsing asymptotic giant branch star
7 – main sequence naked helium star
8 – Hertzsprung gap naked helium star
9 – giant branch naked helium star
10 – helium white dwarf
11 – carbon/oxygen white dwarf
12 – oxygen/neon white dwarf
13 – neutron star
14 – black hole
15 – massless remnant 16 – hydrogen WD (formed from low mass MS star)
17 – hybrid (He envelope/CO core) WD
-1 – naked carbon/oxygen core

The number in the bracets next to the filename Disk_single_dis_sys_model_A.dat (0.99) is the ratio of the number of simulated systems (in the file) to the expected number of systems in the Milky Way. So in order to get a better estimate, one need to divide the quantities from file ( refering to number of BHs ) by the factor in bracket.

3. Galactic black holes (BH) database

Bulge single black holes:
Bulge_single_stars.dat (1.33)
Bulge_single_mergers_A.dat (1.11)
Bulge_single_dis_sys_A.dat (1.11)
Bulge_single_mergers_B.dat (1.11)
Bulge_single_dis_sys_B.dat (1.11)

Bulge black holes in binary systems:
Bulge_binary_A.dat (1.11)
Bulge_binary_B.dat (1.11)

Disk single black holes:
Disk_single_stars.dat (0.97)
Disk_single_mergers_A.dat (0.99)
Disk_single_dis_sys_A.dat (0.99)
Disk_single_mergers_B.dat (0.99)
Disk_single_dis_sys_B.dat (0.99)

Disk black holes in binary systems:
Disk_binary_A.dat (0.99)
Disk_binary_B.dat (0.99)

Halo single black holes:
Halo_single_stars.dat (0.77)
Halo_single_mergers_A.dat (0.94)
Halo_single_dis_sys_A.dat (0.94)
Halo__single_mergers_B.dat (0.94)
Halo_single_dis_sys_B.dat (0.94)

Halo black holes in binary systems:
Halo_binary_A.dat (0.94)
Halo_binary_B.dat (0.94)


4. Galactic neutron stars (NS) database

We have also created a similar database for Galactic neutron stars.

Bulge single neutron stars:
Bulge_single_stars_NS.dat (1.33)
Bulge_single_mergers_A_NS.dat (1.11)
Bulge_single_dis_sys_A_NS.dat (1.11)
Bulge_single_mergers_B_NS.dat (1.11)
Bulge_single_dis_sys_B_NS.dat (1.11)

Bulge neutron stars in binary systems:
Bulge_binary_A_NS.dat (1.11)
Bulge_binary_B_NS.dat (1.11)

Disk single neutron stars:
Disk_single_stars_NS.dat (0.97)
Disk_single_mergers_A_NS.dat (0.99)
Disk_single_dis_sys_A_NS.dat (0.99)
Disk_single_mergers_B_NS.dat (0.99)
Disk_single_dis_sys_B_NS.dat (0.99)

Disk neutron stars in binary systems:
Disk_binary_A_NS.dat (0.99)
Disk_binary_B_NS.dat (0.99)

Halo single neutron stars:
Halo_single_stars_NS.dat (0.77)
Halo_single_mergers_A_NS.dat (0.94)
Halo_single_dis_sys_A_NS.dat (0.94)
Halo__single_mergers_B_NS.dat (0.94)
Halo_single_dis_sys_B_NS.dat (0.94)

Halo neutron stars in binary systems:
Halo_binary_A_NS.dat (0.94)
Halo_binary_B_NS.dat (0.94)


If you have any questions please contact us:

Aleksandra Olejak: a.olejak@student.uw.edu.pl, aleksandra.olejak@wp.pl
Chris Belczynski: chrisbelczynski@gmail.com