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Home All issues Volume 624 (April 2019) A&A, 624 (2019) A66 Full HTML
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Table 1.

Outcome of our model variations.

Physical assumptions Parameter Value ⟨L⟩ ⟨Lrun⟩ ⟨Lwalk⟩ ⟨v⟩ vmed ⟨M2⟩ ℛMS ℛ7.5 ℛ15 ℳ 𝒟
[pc] [pc] [pc] [km s−1] [km s−1] [M⊙] [M⊙] [M⊙] [%] [%]
Fiducial population See Sect. 2 126 584 103 12.4 10.4 10.8 9.8 10.9 20.1 19.9 26.7 0.22 0.86 0.5 10.1
Mass transfer efficiency βRLOF 0 139 493 98 15.1 11.6 7.7 8.6 7.6 10.3 8.7 5.8 0.23 0.86 0.3 1.5
0.5 122 363 111 12.8 10.5 10.2 12.0 10.1 21.7 20.7 11.0 0.22 0.87 1.2 8.6
1 82 214 80 11.2 9.8 12.1 11.9 12.1 33.0 46.9 26.6 0.21 0.87 0.7 14.7
Angular momentum loss γRLOF γdisk 72 544 64 10.7 9.8 10.5 6.4 10.7 22.6 59.0 53.1 0.36 0.85 0.2 7.3
1 129 592 104 12.6 10.5 10.8 10.0 10.9 19.3 18.5 25.3 0.22 0.86 0.6 9.9
Common envelope efficiency αCE 0.1 126 581 103 12.4 10.3 10.9 11.3 10.9 23.8 19.8 26.3 0.23 0.86 0.5 10.1
10 135 730 103 12.7 10.5 10.6 7.5 10.9 12.6 18.7 26.5 0.16 0.84 0.5 10.0
Mass ratio for case A merger qcrit,  A 0.80 128 593 104 12.3 10.3 10.7 9.6 10.7 20.1 19.9 27.5 0.24 0.86 0.5 10.2
0.25 134 637 102 13.0 9.4 11.1 10.3 11.1 17.5 15.9 23.0 0.17 0.86 0.6 9.4
Mass ratio for case B merger qcrit,  B 1.0 100 407 100 9.5 10.8 8.6 3.5 8.8 – – – 0.43 0.89 – 5.0
0.5 103 717 102 9.1 9.3 8.3 3.0 8.4 – – – 0.48 0.89 – 5.0
0.0 167 870 107 13.8 10.1 10.7 9.4 10.8 12.4 11.6 24.5 0.16 0.85 0.6 10.1
Mass ratio for case C merger qcrit,  RSG 1.0 123 509 82 14.6 11.4 9.9 8.1 10.2 7.9 9.5 17.0 0.31 0.80 0.6 6.3
Mass ratio for case C merger and (qcrit,  RSG, αCE) (1.0, 0.1) 109 626 79 13.3 10.5 10.4 12.3 10.3 23.7 17.7 19.4 0.41 0.82 0.5 6.4
Common Envelope efficiency (1.0, 10) 177 764 91 17.9 13.2 9.6 7.9 9.9 6.0 6.8 12.2 0.18 0.78 0.7 6.4
Natal kick amplitude σkick (km s−1) 0 66 – 66 3.8 10.2 1.6 – 1.6 – – – 0.22 0.16 – –
300 128 572 103 12.7 10.4 11.0 10.3 11.0 18.7 18.0 22.9 0.22 0.87 0.6 10.3
1000 132 490 102 13.9 10.9 11.7 13.8 11.5 13.8 12.0 11.6 0.22 0.91 1.2 11.2
BH kicks 100 km s−1, (fb = 0) for BH 2*121 2*395 2*97 2*13.9 2*10.7 2*12.8 2*18.7 2*12.4 2*13.7 2*11.3 2*9.0 2*0.22 2*0.97 2*0.1 2*12.1
265 km s−1 for NS
Double maxwellian with 30 km s−1 for MNS ≤ 1.35 M⊙ 2*105 2*423 2*87 2*12.2 2*9.5 2*10.2 2*14.5 2*10.0 2*30.0 2*17.5 2*15.5 2*0.22 2*0.65 2*0.5 2*4.9
265 km s−1 for MNS >  1.35 M⊙
Restricted kick directions α <  10 deg 127 582 103 12.5 10.5 10.9 9.7 11.0 19.8 19.4 27.4 0.22 0.87 0.6 10.3
90 deg − α <  45 deg 128 572 102 12.5 10.4 10.8 10.7 10.8 18.1 17.2 19.4 0.22 0.86 0.5 10.0
Fallback fraction fb 0 121 395 97 13.9 10.7 12.8 18.7 12.4 13.7 11.3 9.0 0.22 0.97 1.5 12.1
Period distribution slope π −1 128 581 102 12.9 10.7 10.6 10.1 10.6 18.7 17.6 22.8 0.28 0.89 0.6 8.9
0 120 593 102 11.5 9.8 10.8 9.0 10.9 23.8 26.4 35.9 0.17 0.85 0.4 10.7
Initial mass function slope α −1.9 125 554 101 12.8 10.5 11.8 10.9 11.8 18.9 18.0 23.9 0.24 0.80 0.6 9.1
−3 125 626 104 11.7 10.1 9.6 8.3 9.6 22.6 24.2 32.7 0.20 0.93 0.5 11.6
Mass ratio slope κ −1 163 629 130 13.2 11.1 7.8 6.8 7.9 14.5 14.5 20.7 0.36 0.86 0.4 6.3
1 99 526 84 11.7 9.7 13.0 12.7 13.1 28.3 27.4 33.2 0.14 0.87 0.5 12.4
Metallicity Z 0.0002 279 706 163 21.6 16.9 9.2 10.8 8.9 4.4 3.7 3.0 0.15 0.77 2.6 7.7
0.0047 190 718 130 15.9 12.5 10.5 11.0 10.4 10.7 8.8 11.1 0.19 0.84 1.2 10.3
0.008 164 682 123 14.4 11.9 10.5 9.9 10.6 13.7 12.8 17.4 0.21 0.84 0.1 11.0
0.03 109 576 87 11.6 9.7 11.2 9.9 11.3 22.5 21.6 32.6 0.24 0.88 0.5 10.0
Initial spin distribution R-A15 126 582 103 12.4 10.4 10.9 9.8 10.9 20.1 19.8 26.5 0.22 0.86 0.5 10.1

Notes. Average distance traveled from the ejection to CC for all massive companions ejected, for massive runaways only, and massive walkaways only (⟨L⟩, ⟨Lrun⟩, ⟨Lwalk⟩), average and median velocity ⟨v⟩ and vmed, average masses for ejected main sequence companions, runaways only, and walkaways only (⟨M2⟩, , ), produced ratio ℛ of walkaways to runaways for all masses, above 7.5 M⊙, and above 15 M⊙, fraction of all the binaries simulated resulting in a merger ℳ, disruption fraction among the non-merging binaries 𝒟, and fraction of runaways and walkaways with masses larger than 15 M⊙ from the disruption of binaries in a steady state population (, ).

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