Luminosity function of low-mass X-ray binaries in the globular cluster system of NGC 1399

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Table 3

Differential slope β_L of the faint end of the GC XLF for the total and restricted samples, derived from Eq. (6), with upper and lower 3σ limits.

	β_L	β_L + 3σ	β_L − 3σ

Total sample: 60′′<r< 240′′
All GCs	−1.46	−1.36	−1.53
Red GCs	−1.44	−1.36	−1.50
Blue GCs	−1.53	−1.23	−1.67

Restricted sample: 120′′<r< 180′′
All GCs	−1.39	−1.23	−1.49
Red GCs	−1.38	−1.21	−1.48
Blue GCs	−1.36	indef.^a	−1.54

Notes.

^(a)

The lower limit on the differential XLF slope of blue GCs in the restricted sample is undefined since the stacking results are compatible within 3σ with a null flux and a flat cumulative XLF.

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