Ultraluminous X-ray sources in Globular Clusters | Astronomy & Astrophysics (A&A)

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Volume 696 (April 2025)

A&A, 696 (2025) A90

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Table 2

Properties of ULXs by group.

Group	k_acc	k_don	M_acc	M_don	a	e	log₁₀L_X,max	∆t_ULX	t_phys,min
G_BH,MS	BH	MS	${27.64}_{- 19.43}^{+ 18.02}$ $27.64_{ - 19.43}^{ + 18.02}$	${45.72}_{- 42.83}^{+ 81.05}$ $45.72_{ - 42.83}^{ + 81.05}$	${40.05}_{- 32.82}^{+ 104.24}$ $40.05_{ - 32.82}^{ + 104.24}$	${0.00}_{- 0.00}^{+ 0.58}$ $0.00_{ - 0.00}^{ + 0.58}$	${40.36}_{- 1.11}^{+ 0.38}$ $40.36_{ - 1.11}^{ + 0.38}$	${0.41}_{- 0.41}^{+ 4.71}$ $0.41_{ - 0.41}^{ + 4.71}$	${6.16}_{- 2.86}^{+ 380.87}$ $6.16_{ - 2.86}^{ + 380.87}$
G_BH,HG	BH	HG	${22.70}_{- 14.22}^{+ 22.73}$ $22.70_{ - 14.22}^{ + 22.73}$	${56.64}_{- 51.47}^{+ 46.70}$ $56.64_{ - 51.47}^{ + 46.70}$	${119.21}_{- 88.52}^{+ 905.18}$ $119.21_{ - 88.52}^{ + 905.18}$	${0.00}_{- 0.00}^{+ 0.45}$ $0.00_{ - 0.00}^{ + 0.45}$	${40.35}_{- 0.84}^{+ 0.32}$ $40.35_{ - 0.84}^{ + 0.32}$	${0.13}_{- 0.13}^{+ 1.35}$ $0.13_{ - 0.13}^{ + 1.35}$	${5.63}_{- 2.74}^{+ 131.94}$ $5.63_{ - 2.74}^{ + 131.94}$
G_BH,CHeB	BH	CHeB	${16.88}_{- 8.38}^{+ 29.46}$ $16.88_{ - 8.38}^{ + 29.46}$	${32.52}_{- 18.12}^{+ 43.30}$ $32.52_{ - 18.12}^{ + 4.30}$	${233.71}_{- 179.54}^{+ 2887.84}$ $233.71_{ - 179.54}^{ + 288.54}$	${0.03}_{- 0.03}^{+ 0.36}$ $0.03_{ - 0.03}^{ + 0.36}$	${40.18}_{- 0.60}^{+ 0.38}$ $40.18_{ - 0.60}^{ + 0.38}$	${0.10}_{- 0.09}^{+ 0.34}$ $0.10_{ - 0.09}^{ + 0.34}$	${7.52}_{- 4.29}^{+ 9.56}$ $7.52_{ - 4.29}^{ + 9.56}$
G_IMBH	BH	(*)	${9351.31}_{- 8738.78}^{+ 4162.72}$ $9351.31_{ - 8738.78}^{ + 4162.72}$	${0.96}_{- 0.73}^{+ 168.06}$ $0.96_{ - 0.73}^{ + 168.06}$	${28.54}_{- 28.26}^{+ 3054.93}$ $28.54_{ - 28.26}^{ + 3054.93}$	${0.56}_{- 0.56}^{+ 0.39}$ $0.56_{ - 0.56}^{ + 0.39}$	${40.84}_{- 1.76}^{+ 2.29}$ $40.84_{ - 1.76}^{ + 2.29}$	${0.00}_{- 0.00}^{+ 3.06}$ $0.00_{ - 0.00}^{ + 3.06}$	${2207.25}_{- 2195.75}^{+ 11595.73}$ $2207.25_{ - 2195.75}^{ + 11595.73}$
G_NS	NS	(**)	${1.27}_{- 0.16}^{+ 1.17}$ $1.27_{ - 0.16}^{ + 1.17}$	${0.78}_{- 0.51}^{+ 4.51}$ $0.78_{ - 0.51}^{ + 4.51}$	${0.45}_{- 0.43}^{+ 51.06}$ $0.45_{ - 0.43}^{ + 51.06}$	${0.00}_{- 0.00}^{+ 0.34}$ $0.00_{ - 0.00}^{ + 0.34}$	${39.22}_{- 0.21}^{+ 0.52}$ $39.22_{ - 0.21}^{ + 0.52}$	${0.05}_{- 0.05}^{+ 27.48}$ $0.05_{ - 0.05}^{ + 27.48}$	${331.03}_{- 258.73}^{+ 12959.06}$ $331.03_{ - 258.73}^{ + 12959.06}$
Other	NS or BH	(***)	${22.13}_{- 20.84}^{+ 22.42}$ $22.13_{ - 20.84}^{ + 22.42}$	${3.22}_{- 2.89}^{+ 32.80}$ $3.22_{ - 2.89}^{ + 32.80}$	${489.01}_{- 488.99}^{+ 3081.72}$ $489.01_{ - 488.99}^{ + 3081.72}$	${0.00}_{- 0.00}^{+ 0.64}$ $0.00_{ - 0.00}^{ + 0.64}$	${39.95}_{- 0.85}^{+ 0.87}$ $39.95_{ - 0.85}^{ + 0.87}$	${0.06}_{- 0.06}^{+ 32.44}$ $0.06_{ - 0.06}^{ + 32.44}$	${143.70}_{- 138.87}^{+ 13216.21}$ $143.70_{ - 138.87}^{ + 13216.21}$

Notes. Median properties and 95% confidence intervals for ULX groups identified in this study. Column definitions: k_acc – accretor type (BH – black hole, NS – neutron star); k_don – donor type; M_acc – accretor mass (M_⊙); M_don – donor mass (M_⊙); a – orbital separation (R_⊙); e – eccentricity; L_X,max – maximum X-ray luminosity (erg/s); ∆t_ULX – ULX lifetime (Myr); t_phys,_min – ULX phase onset age (Myr). Donor types: MS – main sequence, HG – Hertzsprung gap, RG – red giant, CHeB – core helium burning. For groups with mixed donor types:^(*) HG: 47%, MS: 41%, RG: 6%, CHeB: 3%; ^(**) RG: 83%, HG: 7%, MS: 6%; ^(,***) RG: 75%, CHeB: 21%; other companion types represent less then 5% of all companions.

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