Probing multi-band variability and mode switching in the candidate transitional millisecond pulsar 3FGL J1544.6–1125

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Volume 700 (August 2025)

A&A, 700 (2025) A130

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Table 2.

Results of the model fit of the SED in the high mode for J1544 (this work) and J1023 (Baglio et al. 2023).

Component	Parameter	Posterior		Prior bounds

		J1544	J1023^( * )	J1544	J1023^( * )
Irradiated star	T_* (K)	$4115_{- 98}^{+ 103}$ $4115^{+103}_{-98}$	$6141_{- 30}^{+ 33}$ $6141^{+33}_{-30}$	𝒩(4100, 100)^( ⋆ )	𝒩(6128, 33)
	Log [L_irr/1 erg/s]	33.7 ± 0.1	33.8^( † )	𝒰(30, 40)	–
Accretion disk	Log [r_in, opt/UV/1 cm]	9.09 ± 0.2	9.49 ± 0.02	𝒰(7, 12)	𝒰(7, 12)
Boundary emission	Log [ν_sync/1 Hz]	$15 . 2_{- 0.1}^{+ 0.4}$ $15.2^{+0.4}_{-0.1}$	$14 . 3_{- 0.3}^{+ 0.4}$ $14.3^{+0.4}_{-0.3}$	𝒰(10, 16)	𝒰(12, 16)
	α_sync	−0.723 ± 0.003	−0.61 ± 0.01	𝒰(0.4, 1.0)	𝒰(−0.9, −0.4)
	Log [F_sync/1 mJy]	$- 1 . 6_{- 0.3}^{+ 0.1}$ $-1.6^{+0.1}_{-0.3}$	$- 1 . 1_{- 0.3}^{+ 0.2}$ $-1.1_{-0.3}^{+0.2}$	𝒰(−5, 5)	𝒰(−3, 2)
Compact jet	Log [ν_break/1 Hz]	–	13.4 ± 0.3	–	𝒰(10, 14)
	α₁	–	0.18 ± 0.06	–	𝒩(0.2, 0.2)
	α₂	–	−0.78 ± 0.04	–	𝒩(−0.7, 0.2)
	Log [F₀/1 mJy]	–	−0.6 ± 0.2	–	𝒰(−2, 0)

Notes. We report the median values of the posterior distributions for the model parameters, along with their lower and upper uncertainties, for J1023 (from Baglio et al. (2023) and indicated as ^( * ), including prior assumptions from references therein) and J1544 (this work). These uncertainties correspond to the 15.9th and 84.1st percentiles of the posterior distributions for each parameter. The final column provides the prior bounds applied to all parameters, where 𝒩(μ, σ) represents a normal distribution with a mean μ and variance σ², and 𝒰(a, b) denotes a uniform distribution in the (a, b) interval. ^( † ) Fixed at 6.5 × 10³³ erg/s (Baglio et al. 2023). ^( ⋆ ) From Britt et al. (2017); see Sect. 4 for a detailed discussion on the irradiation component.

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