DOI: 10.5281/zenodo.7599871
title: Dataset for Runaway and Hypervelocity Stars from Compact Object Encounters in Globular Clusters

description: The dataset used for Cabrera & Rodriguez 2023. If building from the showyourwork-enabled GitHub, the file can be directly unzipped into the <code>src/data</code> folder. The top-level contains folders for <code>CMC</code> model- and Milky Way globular cluster-delineated data (<code>cmc</code> and <code>mwgcs</code>, respectively), and some auxiliary files, including the composite catalogs. Within the two folders are subfolders for each of the <code>CMC</code> models and MWGCs. The <code>CMC</code> model folders contain some of the output files from the <code>CMC Cluster Catalog</code> (Kremer+20) (used in this project to examine GC evolution), and also two files <code>output_N-10.txt</code> (which has data for all <code>Fewbody</code> realizations for the model) and <code>output_N-10_ejections.txt</code> (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 <code>Fewbody</code> arguments: # Parameter Description Units 1 time Physical time of encounter in <code>CMC </code>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 <code>CMC </code>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 <code>Fewbody</code> - 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<code> Fewbody </code>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 <code>Fewbody </code>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 <code>Fewbody </code>object indices to specify if objects end up in a binary ((a,b)) or if they merge (a:b) (note that <code>Fewbody</code> initializes all binary-single encounters in the <code>type_f=3</code> 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 <code>output_N-10_ejections.txt</code> 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 <code>mf</code> and <code>rf</code>, which indicate the mass and radius of the ejected object. Each of the <code>mwgcs</code> folders contain the FITS files described in Appendix B of the text. There are also <code>output_N-10_ejections.txt</code> files similar to the ones for the <code>CMC</code> 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