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 1.

Spectral parameters of joint fitting of NICER+NuSTAR.

Component	Parameters	Model 1	Model 2	Model 3
TBabs	n_H (10²² cm⁻²)	$5 . 7_{- 0.1}^{- 0.1}$ $5.7_{-0.1}^{-0.1}$	$4 . 9_{- 0.1}^{+ 0.1}$ $4.9_{-0.1}^{+0.1}$	$5 . 2_{- 0.1}^{+ 0.1}$ $5.2_{-0.1}^{+0.1}$

zxipcf	N_h (10²² cm⁻²)	$81_{- 16}^{+ 19}$ $81_{-16}^{+19}$	$41_{- 11}^{+ 7}$ $41_{-11}^{+7}$	$47_{- 11}^{+ 29}$ $47_{-11}^{+29}$
	log ξ	$4 . 1_{- 0.1}^{+ 0.1}$ $4.1_{-0.1}^{+0.1}$	$4 . 0_{- 0.1}^{+ 0.1}$ $4.0_{-0.1}^{+0.1}$	$4 . 1_{- 0.1}^{+ 0.1}$ $4.1_{-0.1}^{+0.1}$
	f	1 (fixed)	1 (fixed)	1 (fixed)
	Redshift	0 (fixed)	0 (fixed)	0 (fixed)

pcfabs	n_H (10²² cm⁻²)	$7 . 5_{- 1.1}^{+ 0.6}$ $7.5_{-1.1}^{+0.6}$	…	…
	f_cov	$0 . 46_{- 0.02}^{+ 0.04}$ $0.46_{-0.02}^{+0.04}$	…	…

edge1	E_edge1 (keV)	$7 . 62_{- 0.03}^{+ 0.03}$ $7.62_{-0.03}^{+0.03}$	$7 . 59_{- 0.01}^{+ 0.04}$ $7.59_{-0.01}^{+0.04}$	$7 . 60_{- 0.04}^{+ 0.05}$ $7.60_{-0.04}^{+0.05}$
	τ_edge1	$0 . 09_{- 0.01}^{+ 0.01}$ $0.09_{-0.01}^{+0.01}$	$0 . 11_{- 0.01}^{+ 0.01}$ $0.11_{-0.01}^{+0.01}$	$0 . 12_{- 0.02}^{+ 0.01}$ $0.12_{-0.02}^{+0.01}$

edge2	E_edge2 (keV)	$8 . 75_{- 0.04}^{+ 0.03}$ $8.75_{-0.04}^{+0.03}$	$8 . 76_{- 0.01}^{+ 0.02}$ $8.76_{-0.01}^{+0.02}$	$8 . 76_{- 0.02}^{+ 0.02}$ $8.76_{-0.02}^{+0.02}$
	τ_edge2	$0 . 19_{- 0.04}^{+ 0.04}$ $0.19_{-0.04}^{+0.04}$	$0 . 25_{- 0.01}^{+ 0.02}$ $0.25_{-0.01}^{+0.02}$	$0 . 25_{- 0.03}^{+ 0.02}$ $0.25_{-0.03}^{+0.02}$

nthComp	Γ	…	…	$3 . 3_{- 0.1}^{+ 0.1}$ $3.3_{-0.1}^{+0.1}$
	kT_e (keV)	…	…	$3 . 9_{- 0.8}^{+ 0.4}$ $3.9_{-0.8}^{+0.4}$
	T_bb (keV)	…	…	$1 . 07_{- 0.01}^{+ 0.01}$ $1.07_{-0.01}^{+0.01}$
	Norm	…	…	$0 . 15_{- 0.01}^{+ 0.01}$ $0.15_{-0.01}^{+0.01}$

thcomp	Γ	$1 . 3_{- 0.1}^{+ 0.1}$ $1.3_{-0.1}^{+0.1}$	$3 . 2_{- 0.1}^{+ 0.1}$ $3.2_{-0.1}^{+0.1}$	…
	kT_e (keV)	$2 . 8_{- 0.1}^{+ 0.1}$ $2.8_{-0.1}^{+0.1}$	$3 . 8_{- 0.1}^{+ 0.2}$ $3.8_{-0.1}^{+0.2}$	…
	f_cov	$0 . 05_{- 0.01}^{+ 0.01}$ $0.05_{-0.01}^{+0.01}$	$0 . 9_{- 0.2}^{+ 0.1}$ $0.9_{-0.2}^{+0.1}$	…

diskbb	kT_in (keV)	$1 . 77_{- 0.02}^{+ 0.03}$ $1.77_{-0.02}^{+0.03}$	…	…
	Norm	$30 . 4_{- 2.2}^{+ 1.9}$ $30.4_{-2.2}^{+1.9}$	…	…

comptt	T₀ (keV)	…	0.23 ^(a)	…
	kT (keV)	…	$1 . 06_{- 0.01}^{+ 0.01}$ $1.06_{-0.01}^{+0.01}$	…
	τ	…	$57_{- 3}^{+ 2}$ $57_{-3}^{+2}$	…
	Norm	…	$0 . 74_{- 0.03}^{+ 0.02}$ $0.74_{-0.03}^{+0.02}$	…

Crabcorr	ΔΓ_FPMA	$0 . 15_{- 0.02}^{+ 0.02}$ $0.15_{-0.02}^{+0.02}$	$0 . 15_{- 0.01}^{+ 0.02}$ $0.15_{-0.01}^{+0.02}$	$0 . 16_{- 0.03}^{+ 0.02}$ $0.16_{-0.03}^{+0.02}$
(plabs)	K_FPMA	$1 . 3_{- 0.1}^{+ 0.1}$ $1.3_{-0.1}^{+0.1}$	$1 . 3_{- 0.1}^{+ 0.1}$ $1.3_{-0.1}^{+0.1}$	$1 . 3_{- 0.1}^{+ 0.1}$ $1.3_{-0.1}^{+0.1}$
	ΔΓ_FPMB	$0 . 14_{- 0.02}^{+ 0.02}$ $0.14_{-0.02}^{+0.02}$	$0 . 15_{- 0.01}^{+ 0.02}$ $0.15_{-0.01}^{+0.02}$	$0 . 16_{- 0.02}^{+ 0.02}$ $0.16_{-0.02}^{+0.02}$
	K_FPMB	$1 . 2_{- 0.1}^{+ 0.1}$ $1.2_{-0.1}^{+0.1}$	$1 . 3_{- 0.1}^{+ 0.1}$ $1.3_{-0.1}^{+0.1}$	$1 . 3_{- 0.1}^{+ 0.1}$ $1.3_{-0.1}^{+0.1}$

Fitting	$χ_{red}^{2}$ $\chi_{\mathrm{red}}^{2}$ /d.o.f.	1.1/339	1.1/340	1.1/341

Unabsorbed L_x	ergs s⁻¹	5.25 × 10³⁷	3.77 × 10³⁷	3.89 × 10³⁷
(1 − 10 keV)

Unabsorbed L_x	ergs s⁻¹	5.53 × 10³⁶	5.37 × 10³⁶	5.45 × 10³⁶
(10 − 25 keV)

Notes. Uncertainties are reported at the 90% confidence interval and were computed using a MCMC of length 10 000. ^(a)T₀ is linked to kT/2.7f_col, where f_col = 1.7.

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