The first cyclotron harmonic of 4U 1538–52 | Astronomy & Astrophysics (A&A)

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Table 4:

Fitted parameters for the fundamental and the first harmonic CRSF.
Parameter	SPI	ISGRI	HEXTE
Fundamental
E_c₁ (keV)	$\rm 22.7^{+0.9}_{-2.4}$	$\rm 22.0^{+1.0}_{-1.6}$	$\rm 20.7^{+1.3}_{-3}$
$\tau_{c_1}$	$\rm0.8^{+0.4}_{-0.3}$	$\rm0.5^{+1.6}_{-0.18}$	$\rm0.5^{+1.3}_{-0.13}$
$\sigma_{c_1}$ (keV)	$\rm 3^{+4}_{-1.7}$	$\rm 3^{+5}_{-2}$	$\rm 4^{+6}_{-3}$
1st Harmonic
E_c₂ (keV)	$\rm 42^{+4}_{-1.5}$	$\rm 47^{+3}_{-10}$	$\rm 48^{+9}_{-7}$
$\tau_{c_2}$	$\rm0.9^{+1.0}_{-0.5}$	$\rm0.8^{+0.5}_{-0.21}$	$\rm0.6^{+1.7}_{-0.3}$
$\sigma_{c_2}$ (keV)	$\rm 3^{+11}_{-1.9}$	$\rm 10^{+22}_{-6}$	$\rm 8^{+24}_{-7}$
$\chi^2_{\nu}$ (d.o.f.)	1.0(14)	1.1(18)	0.8(16)

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