The high-energy cyclotron line in 2S 1417-624 discovered with Insight-HXMT during the 2018 outburst

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Volume 691 (November 2024)

A&A, 691 (2024) A215

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Table 1.

Best-fitting parameters in different models.

	Cut-off PL		HIGHECUT

	gabs ⁽¹⁾	cyclabs ⁽²⁾	gabs	cyclabs
E_cyc (keV)	$102 . 7_{- 3.6}^{+ 4.7}$ $102.7_{-3.6}^{+4.7}$	$99 . 5_{- 3.3}^{+ 4.2}$ $99.5_{-3.3}^{+4.2}$	$102 . 5_{- 3.7}^{+ 4.5}$ $102.5_{-3.7}^{+4.5}$	$99 . 7_{- 2.0}^{+ 2.8}$ $99.7_{-2.0}^{+2.8}$
σ_cyc (keV)/W_f (keV)	$11 . 7_{- 2.8}^{+ 3.7}$ $11.7_{-2.8}^{+3.7}$	$12 . 6_{- 4.7}^{+ 4.6}$ $12.6_{-4.7}^{+4.6}$	$12 . 0_{- 2.4}^{+ 3.3}$ $12.0_{-2.4}^{+3.3}$	$11 . 6_{- 3.5}^{+ 3.0}$ $11.6_{-3.5}^{+3.0}$
d_cyc (keV)/D_f	$14 . 2_{- 3.6}^{+ 3.5}$ $14.2_{-3.6}^{+3.5}$	$0 . 6_{- 0.1}^{+ 0.2}$ $0.6_{-0.1}^{+0.2}$	$14 . 7_{- 3.3}^{+ 4.3}$ $14.7_{-3.3}^{+4.3}$	$0 . 6_{- 0.1}^{+ 0.2}$ $0.6_{-0.1}^{+0.2}$
N_H	$1 . 6_{- 0.2}^{+ 0.2}$ $1.6_{-0.2}^{+0.2}$	$1 . 7_{- 0.3}^{+ 0.3}$ $1.7_{-0.3}^{+0.3}$	$2 . 4_{- 0.3}^{+ 0.3}$ $2.4_{-0.3}^{+0.3}$	$2 . 5_{- 0.3}^{+ 0.3}$ $2.5_{-0.3}^{+0.3}$
Γ	$0 . 21_{- 0.01}^{+ 0.01}$ $0.21_{-0.01}^{+0.01}$	$0 . 22_{- 0.01}^{+ 0.01}$ $0.22_{-0.01}^{+0.01}$	$0 . 21_{- 0.01}^{+ 0.01}$ $0.21_{-0.01}^{+0.01}$	$0 . 22_{- 0.01}^{+ 0.01}$ $0.22_{-0.01}^{+0.01}$
Norm	$0 . 033_{- 0.001}^{+ 0.001}$ $0.033_{-0.001}^{+0.001}$	$0 . 034_{- 0.001}^{+ 0.001}$ $0.034_{-0.001}^{+0.001}$	$0 . 027_{- 0.001}^{+ 0.001}$ $0.027_{-0.001}^{+0.001}$	$0 . 027_{- 0.001}^{+ 0.001}$ $0.027_{-0.001}^{+0.001}$
E_cut (keV)	$16 . 8_{- 0.2}^{+ 0.2}$ $16.8_{-0.2}^{+0.2}$	$17 . 1_{- 0.2}^{+ 0.1}$ $17.1_{-0.2}^{+0.1}$	$16 . 9_{- 0.1}^{+ 0.2}$ $16.9_{-0.1}^{+0.2}$	$17 . 1_{- 0.2}^{+ 0.1}$ $17.1_{-0.2}^{+0.1}$
E_f (keV)	...	...	$4 . 1_{- 0.3}^{+ 0.2}$ $4.1_{-0.3}^{+0.2}$	$4 . 1_{- 0.2}^{+ 0.2}$ $4.1_{-0.2}^{+0.2}$
E_Fe (keV)	$6 . 48_{- 0.03}^{+ 0.03}$ $6.48_{-0.03}^{+0.03}$	$6 . 47_{- 0.02}^{+ 0.03}$ $6.47_{-0.02}^{+0.03}$	$6 . 47_{- 0.03}^{+ 0.03}$ $6.47_{-0.03}^{+0.03}$	$6 . 46_{- 0.03}^{+ 0.04}$ $6.46_{-0.03}^{+0.04}$
σ_Fe (keV)	$0 . 16_{- 0.03}^{+ 0.03}$ $0.16_{-0.03}^{+0.03}$	$0 . 15_{- 0.02}^{+ 0.03}$ $0.15_{-0.02}^{+0.03}$	$0 . 15_{- 0.05}^{+ 0.04}$ $0.15_{-0.05}^{+0.04}$	$0 . 13_{- 0.05}^{+ 0.05}$ $0.13_{-0.05}^{+0.05}$
I_Fe (keV)	$0 . 0009_{- 0.0001}^{+ 0.0001}$ $0.0009_{-0.0001}^{+0.0001}$	$0 . 0009_{- 0.0001}^{+ 0.0001}$ $0.0009_{-0.0001}^{+0.0001}$	$0 . 0009_{- 0.0002}^{+ 0.0002}$ $0.0009_{-0.0002}^{+0.0002}$	$0 . 0009_{- 0.0001}^{+ 0.0001}$ $0.0009_{-0.0001}^{+0.0001}$
kT_bb (keV)	$0 . 57_{- 0.02}^{+ 0.02}$ $0.57_{-0.02}^{+0.02}$	$0 . 56_{- 0.02}^{+ 0.01}$ $0.56_{-0.02}^{+0.01}$	$0 . 53_{- 0.01}^{+ 0.01}$ $0.53_{-0.01}^{+0.01}$	$0 . 53_{- 0.01}^{+ 0.02}$ $0.53_{-0.01}^{+0.02}$
Cons_ME/LE	$1 . 03_{- 0.01}^{+ 0.01}$ $1.03_{-0.01}^{+0.01}$	$1 . 03_{- 0.01}^{+ 0.01}$ $1.03_{-0.01}^{+0.01}$	$1 . 03_{- 0.01}^{+ 0.01}$ $1.03_{-0.01}^{+0.01}$	$1 . 03_{- 0.01}^{+ 0.01}$ $1.03_{-0.01}^{+0.01}$
Cons_HE/LE	$1 . 01_{- 0.01}^{+ 0.01}$ $1.01_{-0.01}^{+0.01}$	$1 . 00_{- 0.01}^{+ 0.01}$ $1.00_{-0.01}^{+0.01}$	$1 . 00_{- 0.01}^{+ 0.01}$ $1.00_{-0.01}^{+0.01}$	$1 . 01_{- 0.01}^{+ 0.01}$ $1.01_{-0.01}^{+0.01}$
Reduced χ² (d.o.f.)	1.04 (1345)	1.04 (1345)	1.04 (1344)	1.04 (1344)

Flux_{2 − 140}	$7 . 89_{- 0.02}^{+ 0.02}$ $7.89_{-0.02}^{+0.02}$

Notes. The flux is given in units of 10⁻⁹ erg cm⁻² s⁻¹, and the column density N_H is listed in units of 10²² atoms cm⁻². For the normalization constants, we fixed the constant to one for the LE instrument and kept the Cons_ME/LE and Cons_HE/LE free.

⁽¹⁾

gabs(E) = $exp (- \frac{d_{cyc}}{\sqrt{2 π} σ_{cyc}} e^{- 0.5 {[(E - E_{cyc}) / σ_{cyc}]}^{2}})$ $\exp \left(-\frac{d_{\mathrm{cyc}}}{\sqrt{2 \pi} \sigma_{\mathrm{cyc}}} e^{-0.5 \left[\left(E-E_{\mathrm{cyc}}\right) / \sigma_{\mathrm{cyc}}\right]^2}\right)$ .

^(b)

cyclabs(E) = $exp [- D_{f} \frac{{(W_{f} E / E_{cyc})}^{2}}{{(E - E_{cyc})}^{2} + W_{f}^{2}}]$ $\exp \left[-D_{\mathrm{f}} \frac{\left(W_{\mathrm{f}} E / E_{\mathrm{cyc}}\right)^{2}}{\left(E-E_{\mathrm{cyc}}\right)^{2} +W_{\mathrm{f}}^{2}}\right]$ .

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