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

Open Access

Table 2.

Best-fit parameters of the Gaussian feature detected at high energies for the PFS and its first harmonic (A₁).

High Energy
	Obs. A		Obs. C		Obs. D

	PFS	A₁	PFS	A₁	PFS	A₁
E (keV)	34.9 ± 0.5 [−1.6, +1.9]	$37 . 9_{- 5.4}^{+ 2.3}$ $Mathematical equation: $ 37.9_{-5.4}^{+2.3} $$	23.1 ± 0.5 [−1.9, +5.2]	34.9 ± 0.6 [±2.0]	35.22 ± 0.34 [±1.0]	36.46 ± 0.19 [±0.56]
σ (keV)	$2 . 8_{- 0.3}^{+ 0.1} [- 1.14, + 0.19]$ $Mathematical equation: $ 2.8^{+0.1}_{-0.3} \; [-1.14, +0.19] $$	$2 . 3_{- 0.8}^{+ 0.5}$ $Mathematical equation: $ 2.3_{-0.8}^{+0.5} $$	$1 . 7_{- 0.4}^{+ 0.5} [- 1.6, + 0.9]$ $Mathematical equation: $ 1.7_{-0.4}^{+0.5}\, [-1.6, +0.9] $$	$3 . 5_{- 0.5}^{+ 0.3} [- 1.6, + 0.5]$ $Mathematical equation: $ 3.5^{+0.3}_{-0.5} \; [-1.6, +0.5] $$	$1 . 94_{- 0.09}^{+ 0.04} [- 0.40, + 0.06]$ $Mathematical equation: $ 1.94^{+0.04}_{-0.09} \; [-0.40, +0.06] $$	$2 . 95_{- 0.08}^{+ 0.04} [- 0.33, + 0.05]$ $Mathematical equation: $ 2.95^{+0.04}_{-0.08} \; [-0.33, +0.05] $$
Amplitude	−0.9 ± 0.2 [±0.6]	$0 . 1_{- 0.3}^{+ 0.7}$ $Mathematical equation: $ 0.1_{-0.3}^{+0.7} $$	$0 . 13_{- 0.04}^{+ 0.05} [- 0.24, + 0.15]$ $Mathematical equation: $ 0.13_{-0.04}^{+0.05}\, [-0.24, +0.15] $$	−0.8 ± 0.2 [−0.6, +0.5]	−0.9 ± 0.1 [±0.3]	−1.80 ± 0.09 [−0.20, +0.27]

Δ (BIC)	23.3	1.4	34.6	21.7	28.4	61.0

Notes. Reported are the medians with 68% credible intervals (99.7% in square brackets) and the model significance of the model with the Gaussian with respect to simple polynomial Δ(BIC); Obs B is omitted as its PFS shows no significant features.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.