Detection of a cyclotron line in the Be X-ray pulsar IGR J06074+2205

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Volume 686 (June 2024)

A&A, 686 (2024) A145

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Table 1.

The best-fit spectral parameters of the IGR J0607.4+2205 for both observations.

Spectral parameter	ObsID 02	ObsID 04
N_H [×10²² cm⁻²]	$1 . 78_{- 0.24}^{+ 0.27}$ $1.78_{-0.24}^{+0.27}$	0.43 (frozen)
Γ	$1 . 29_{- 0.01}^{+ 0.01}$ $1.29_{-0.01}^{+0.01}$	$1 . 43_{- 0.07}^{+ 0.06}$ $1.43_{-0.07}^{+0.06}$
Γ_Norm [×10⁻²]	$5 . 33_{- 0.15}^{+ 0.17}$ $5.33_{-0.15}^{+0.17}$	$0 . 41_{- 0.01}^{+ 0.01}$ $0.41_{-0.01}^{+0.01}$
E_cut (keV)	$15 . 89_{- 0.63}^{+ 0.65}$ $15.89_{-0.63}^{+0.65}$	$30 . 93_{- 1.95}^{+ 3.03}$ $30.93_{-1.95}^{+3.03}$
E_fold (keV)	$40 . 14_{- 6.02}^{+ 7.00}$ $40.14_{-6.02}^{+7.00}$	$11 . 81_{- 2.89}^{+ 6.98}$ $11.81_{-2.89}^{+6.98}$
Width	$10 . 18_{- 3.24}^{+ 2.57}$ $10.18_{-3.24}^{+2.57}$	5.0 (frozen)
kT_BB (keV)	−	$1 . 18_{- 0.03}^{+ 0.03}$ $1.18_{-0.03}^{+0.03}$
Radius_BB (km)	−	$0 . 17_{- 0.01}^{+ 0.01}$ $0.17_{-0.01}^{+0.01}$
E_Fe (keV)	$6 . 3_{- 0.1}^{+ 0.1}$ $6.3_{-0.1}^{+0.1}$	−
EW_Fe (eV)	$16_{- 4}^{+ 5}$ $16_{-4}^{+5}$	−
E_CRSF (keV)	$50 . 62_{- 1.20}^{+ 0.97}$ $50.62_{-1.20}^{+0.97}$	−
σ_CRSF (keV)	$11 . 08_{- 1.18}^{+ 0.93}$ $11.08_{-1.18}^{+0.93}$	−
τ_CRSF	$1 . 31_{- 0.16}^{+ 0.14}$ $1.31_{-0.16}^{+0.14}$	−
Cross norm.	0.99 ± 0.01	0.99 ± 0.01

χ² (d.o.f.)	481 (456)	256 (242)
Flux [×10⁻¹⁰] ^(a)	$12 . 55_{- 0.01}^{+ 0.01}$ $12.55_{-0.01}^{+0.01}$	$0 . 86_{- 0.11}^{+ 0.01}$ $0.86_{-0.11}^{+0.01}$
Luminosity [×10³⁵] ^(b)	$30 . 42_{- 0.34}^{+ 0.16}$ $30.42_{-0.34}^{+0.16}$	$2 . 09_{- 0.26}^{+ 0.02}$ $2.09_{-0.26}^{+0.02}$

Notes. The errors are quoted at 90% confidence intervals.

^(a)

The flux is given in the energy range of 3−78 keV in units of erg cm⁻² s⁻¹.

^(b)

The luminosity is given in the energy range of 3−78 keV in units of erg s⁻¹.

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