Likely detection of magnetic field related LFQPO in the soft X-ray rebrightening of GRS 1915+105

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Volume 686 (June 2024)

A&A, 686 (2024) A211

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Table 2.

Spectral parameters of joint fitting of NICER.

Component	Parameters	4647012001	4647012001	4647012501	4647012501
TBabs	n_H (10²² cm⁻²)	$5 . 1_{- 0.1}^{+ 0.1}$ $5.1_{-0.1}^{+0.1}$	$5 . 1_{- 0.1}^{+ 0.1}$ $5.1_{-0.1}^{+0.1}$	$4 . 9_{- 0.1}^{+ 0.1}$ $4.9_{-0.1}^{+0.1}$	$4 . 9_{- 0.1}^{+ 0.1}$ $4.9_{-0.1}^{+0.1}$

zxipcf	N_h (10²² cm⁻²)	$51_{- 17}^{+ 47}$ $51_{-17}^{+47}$	$49_{- 13}^{+ 26}$ $49_{-13}^{+26}$	$10_{- 3}^{+ 4}$ $10_{-3}^{+4}$	$10_{- 2}^{+ 11}$ $10_{-2}^{+11}$
	log ξ	$4 . 1_{- 0.1}^{+ 0.1}$ $4.1_{-0.1}^{+0.1}$	$4 . 1_{- 0.1}^{+ 0.1}$ $4.1_{-0.1}^{+0.1}$	$3 . 5_{- 0.1}^{+ 0.1}$ $3.5_{-0.1}^{+0.1}$	$3 . 5_{- 0.1}^{+ 0.3}$ $3.5_{-0.1}^{+0.3}$
	f	1 (fixed)	1 (fixed)	1 (fixed)	1 (fixed)
	Redshift	0 (fixed)	0 (fixed)	0 (fixed)	0 (fixed)

edge1	E_edge1 (keV)	$7 . 6_{- 0.1}^{+ 0.1}$ $7.6_{-0.1}^{+0.1}$	7.7 (fixed)	$7 . 5_{- 0.1}^{+ 0.2}$ $7.5_{-0.1}^{+0.2}$	7.7 (fixed)
	τ_edge1	$0 . 10_{- 0.02}^{+ 0.02}$ $0.10_{-0.02}^{+0.02}$	0.1 (fixed)	$0 . 09_{- 0.06}^{+ 0.06}$ $0.09_{-0.06}^{+0.06}$	0.1 (fixed)

edge2	E_edge2 (keV)	$8 . 8_{- 0.1}^{+ 0.1}$ $8.8_{-0.1}^{+0.1}$	8.8 (fixed)	$8 . 6_{- 0.1}^{+ 0.1}$ $8.6_{-0.1}^{+0.1}$	8.8 (fixed)
	τ_edge2	$0 . 18_{- 0.04}^{+ 0.04}$ $0.18_{-0.04}^{+0.04}$	0.18 (fixed)	$0 . 23_{- 0.1}^{+ 0.1}$ $0.23_{-0.1}^{+0.1}$	0.18 (fixed)

nthComp	Γ	$3 . 7_{- 0.3}^{+ 0.2}$ $3.7_{-0.3}^{+0.2}$	$3 . 7_{- 0.2}^{+ 0.2}$ $3.7_{-0.2}^{+0.2}$	$4 . 5_{- 0.5}^{+ 1.0}$ $4.5_{-0.5}^{+1.0}$	$4 . 8_{- 0.5}^{+ 0.8}$ $4.8_{-0.5}^{+0.8}$
	kT_e (keV)	4 (fixed)	4 (fixed)	4 (fixed)	4 (fixed)
	T_bb (keV)	$1 . 12_{- 0.03}^{+ 0.02}$ $1.12_{-0.03}^{+0.02}$	$1 . 12_{- 0.02}^{+ 0.02}$ $1.12_{-0.02}^{+0.02}$	$1 . 08_{- 0.03}^{+ 0.04}$ $1.08_{-0.03}^{+0.04}$	$1 . 10_{- 0.04}^{+ 0.03}$ $1.10_{-0.04}^{+0.03}$
	Norm	$0 . 14_{- 0.01}^{+ 0.01}$ $0.14_{-0.01}^{+0.01}$	$0 . 14_{- 0.01}^{+ 0.01}$ $0.14_{-0.01}^{+0.01}$	$0 . 08_{- 0.01}^{+ 0.01}$ $0.08_{-0.01}^{+0.01}$	$0 . 08_{- 0.01}^{+ 0.01}$ $0.08_{-0.01}^{+0.01}$

Unabsorbed luminosity (1 − 10 keV)	ergs s⁻¹	3.84 × 10³⁷	3.83 × 10³⁷	2.01 × 10³⁷	1.99 × 10³⁷

Fitting (system error 1%)	$χ_{red}^{2}$ $\chi_{\mathrm{red}}^{2}$ /d.o.f.	1.13/135	1.12/139	1.25/119	1.28/119

Notes. Uncertainties are reported at the 90% confidence interval and were computed using a MCMC of length 10 000.

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