Dataset for Runaway and Hypervelocity Stars from Compact Object Encounters in Globular Clusters

The dataset used for Cabrera & Rodriguez 2023.  If building from the showyourwork-enabled GitHub, the file can be directly unzipped into the src/data folder.

The top-level contains folders for CMC model- and Milky Way globular cluster-delineated data (cmc and mwgcs, respectively), and some auxiliary files, including the composite catalogs.  Within the two folders are subfolders for each of the CMC models and MWGCs.  The CMC model folders contain some of the output files from the CMC Cluster Catalog (Kremer+20) (used in this project to examine GC evolution), and also two files output_N-10.txt (which has data for all Fewbody realizations for the model) and output_N-10_ejections.txt (which has data for all ejections from the model).  The columns in the former file are regrettably not labeled, but correspond to the following parameters, many of which are direct Fewbody arguments:

#
Parameter
Description
Units

1
time
Physical time of encounter in CMC model
Myr

2
b
Impact parameter
a1

3
vinf
Velocity of single object at infinity
v_crit

4
a1
Initial semi-major axis of binary
AU

5
e1
Initial binary eccentricity
-

6
vesc
Local escape velocity in CMC model
km/s

7
m10
Mass of first binary component
Msun

8
m11
Mass of second binary component
Msun

9
m0
Mass of single object
Msun

10
r10
Radius of first binary component
Rsun

11
r11
Radius of second binary component
Rsun

12
r0
Radius of single object
Rsun

13
k10
BSE k-type of first binary component
-

14
k11
BSE k-type of second binary component
-

15
k0
BSE k-type of single object
-

16
s
Random seed for Fewbody
-

17
type_i

Index classifying initial system (see below)

-

18
type_f
Index classifying final system (see below)
-

19
v_crit
Critical velocity of encounter (Fregeau+04)
km/s

20
a_fin
Final semi-major axis of binary (0 if no binary is present)
AU

21
e_fin
Final binary eccentricity (identically 0 if no binary is present)
-

22
Lx
x-component of the initial angular momentum of the system
code

23
Ly
y-component of the initial angular momentum of the system
code

24
Lz
z-component of the initial angular momentum of the system
code

25
Lbinx
x-component of the angular momentum of the initial binary
code

26
Lbiny
y-component of the angular momentum of the initial binary
code

27
Lbinz
z-component of the angular momentum of the initial binary
code

28
Ei
Initial energy of the encounter
code

29
DeltaEfrac
Fractional change in energy by the time of termination
-

30/34/38
vfin0/1/2
Final velocity of the final top-level object with Fewbody index 0/1/2 (Fregeau+04)
v_crit

31/35/39
kf0/1/2
BSE k-type of the same
-

32/36/40
Rmin0/1/2
Minimum distance between this object and any other object during the encounter
AU

33/37/41
Rmin_j0/1/2
Fewbody index of the other object at closest passage
AU

The initial encounter classifying indices are as follows, where "C" denotes a compact object and "S" a star:

type_i
Configuration

1
(C,C)+S

2
(C,S)+C

3
(C,S)+S

4
(S,S)+C

The final encounter classifying indices are as follows, using the initial Fewbody object indices to specify if objects end up in a binary ((a,b)) or if they merge (a:b) (note that Fewbody initializes all binary-single encounters in the type_f=3 configuration, i.e. the object index 0 is assigned to the single):

type_f
Configuration

0
0+1+2 (Ionization)

1
(0,1)+2

2
(0,2)+1

3
0+(1,2)

4
0:1+2

5
0:2+1

6
1:2+0

7
0:1:2

-2
binary

-3
hierarchical triple

The columns in output_N-10_ejections.txt are labeled, and use many of the same headers in the first table; the object indices for fields 30-41 are dropped because each row in this file corresponds to an escaper.  The two additions are mf and rf, which indicate the mass and radius of the ejected object.

Each of the mwgcs folders contain the FITS files described in Appendix B of the text. There are also output_N-10_ejections.txt files similar to the ones for the CMC models; the MWGC versions contain the additional fields below:

Parameter
Description
Units

vout
Velocity of object at the time of ejection from the representative model
km/s

X/Y/Z
Galactocentric X/Y/Z coordinate of object at the present day
kpc

U/V/W
Galactocentric U/V/W velocity of object at the present day
km/s