An in-depth analysis of the variable cyclotron lines in GX 301−2

Open Access

Table 1.

Summary of NuSTAR observations of GX 301−2.

Date	φ_orb^(a)	$L_{37}^{NS}$ $\mathcal{L}_{37}^\mathrm{NS}$ ^(b)	Observation ID	Exposure [ks]	E_CRSF1 [keV]	E_CRSF2 [keV]	Reference
2014-10-29	0.67	0.71	30001041002	38.2	$34 . 7_{- 1.4}^{+ 2.1}$ $34.7^{+2.1}_{-1.4}$	$50 . 6_{- 1.7}^{+ 2.1}$ $50.6^{+2.1}_{-1.7}$	Fürst et al. (2018)
2015-10-04	0.87	1.08	30101042002	35.7	$34 . 5_{- 1.4}^{+ 1.6}$ $34.5^{+1.6}_{-1.4}$	$49 . 6_{- 1.2}^{+ 1.3}$ $49.6^{+1.3}_{-1.2}$	Fürst et al. (2018)
2019-03-03	0.93	3.69	90501306002	23.0	36.7 ± 0.3	$55 . 1_{- 0.6}^{+ 0.7}$ $55.1^{+0.7}_{-0.6}$	Nabizadeh et al. (2019)
2020-12-27	0.97	5.02	30601013002	48.5	$37 . 4_{- 1.0}^{+ 1.1}$ $37.4^{+1.1}_{-1.0}$	$51 . 5_{- 1.0}^{+ 1.1}$ $51.5^{+1.1}_{-1.0}$	This work
2022-02-02	0.67	0.55	30701001002	35.6	$35 . 4_{- 0.2}^{+ 0.6}$ $35.4^{+0.6}_{-0.2}$ ^(c)	54 ± 2 ^(c)	McCulloch et al. (in prep.)

Notes.

^(a)

Orbital phase, which is calculated in the same manner as described in the caption of Fig. 1.

^(b)

Absorbed luminosity in units of 10³⁷ erg s⁻¹ in the energy band 5–50 keV in the NS rest frame as obtained directly from the NuSTAR data. In order to transform the value from the observer’s frame to the NS frame, the obtained values are multiplied by (1 + z)⁴, where z = 0.3, which takes the gravitational red-shift, time dilatation, and surface magnification into account.

^(c)

The cyclotron line parameters for the most recent observation are preliminary results and subject to further analysis.

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