The elusive cyclotron line in 4U 1901+03: Hidden, yet present

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Table 4.

Posterior parameter estimates for the cyclotron resonance model.

Parameter	A	B	C	D
C_FPMB	0.938 ± 0.003	0.988 ± 0.004	0.985 ± 0.004	0.969 ± 0.003
Γ	$- 0 . 27_{- 0.08}^{+ 0.07}$ $Mathematical equation: $ -0.27 _{-0.08}^{+0.07} $$	0.2 ± 0.1	−0.1 ± 0.1	−0.8 ± 0.1
E_cut [keV]	6.2 ± 0.1	6.7 ± 0.2	6.1 ± 0.2	5.4 ± 0.1
Norm	0.057 ± 0.009	0.20 ± 0.06	0.06 ± 0.01	0.007 ± 0.002
E_cyc,[keV]	$32 . 1_{- 0.8}^{+ 1.2}$ $Mathematical equation: $ 32.1^{+1.2}_{-0.8} $$	32.2 ± 1.3	32.1 ± 0.8	31.7 ± 0.6
σ_CRSF [keV]	$4 . 5_{- 1.3}^{+ 1.4}$ $Mathematical equation: $ 4.5 _{-1.3}^{+1.4} $$	$6 . 0_{- 1.0}^{+ 0.7}$ $Mathematical equation: $ 6.0^{+0.7}_{-1.0} $$	$5 . 2_{- 0.8}^{+ 0.9}$ $Mathematical equation: $ 5.2 _{-0.8}^{+0.9} $$	5.8 ± 0.7
Depth_CRSF [keV]	$0 . 8_{- 0.3}^{+ 0.5}$ $Mathematical equation: $ 0.8^{+0.5}_{-0.3} $$	$1 . 6_{- 0.5}^{+ 0.6}$ $Mathematical equation: $ 1.6^{+0.6}_{-0.5} $$	$3 . 0_{- 0.8}^{+ 1.1}$ $Mathematical equation: $ 3.0^{+1.1}_{-0.8} $$	$2 . 7_{- 0.6}^{+ 0.8}$ $Mathematical equation: $ 2.7_{-0.6}^{+0.8} $$

log₁₀BF	0.98	5.1	25.0	23.8

Notes. We report the median and 68% credible intervals (16th and 84th percentiles) for each parameter. The final row provides the log-evidence (log₁₀BF) compared to a null model.

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