Unveiling the rebrightening mechanism of GRS 1915+105: Insights from a change in the quasi-periodic oscillations and from a wind analysis

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Volume 692 (December 2024)

A&A, 692 (2024) A117

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Table 1.

Joint fitting results of NICER (20 combined observations) and NuSTAR.

Component	Parameters	Phase-average	0.0 − 0.1	0.5 − 0.6
TBabs	n_H (10²² cm⁻²)	$4 . 78_{- 0.11}^{+ 0.09}$ $4.78_{-0.11}^{+0.09}$	4.78 (fixed)	4.78 (fixed)

gabs (Fe XXV He-α)	LineE (keV)	$6 . 662_{- 0.006}^{+ 0.005}$ $6.662_{-0.006}^{+0.005}$	6.7 (fixed)	6.7 (fixed)
	Sigma (keV)	$0 . 039_{- 0.009}^{+ 0.007}$ $0.039_{-0.009}^{+0.007}$	0.03 (fixed)	0.03 (fixed)
	Strength (keV)	$0 . 055_{- 0.001}^{+ 0.002}$ $0.055_{-0.001}^{+0.002}$	$0 . 060_{- 0.003}^{+ 0.008}$ $0.060_{-0.003}^{+0.008}$	$0 . 054_{- 0.004}^{+ 0.005}$ $0.054_{-0.004}^{+0.005}$

gabs (Fe XXVI Ly-α)	LineE (keV)	$6 . 977_{- 0.008}^{+ 0.007}$ $6.977_{-0.008}^{+0.007}$	6.97 (fixed)	6.97 (fixed)
	Sigma (keV)	$0 . 007_{- 0.002}^{+ 0.002}$ $0.007_{-0.002}^{+0.002}$	0.01 (fixed)	0.01 (fixed)
	Strength (keV)	$0 . 046_{- 0.016}^{+ 0.016}$ $0.046_{-0.016}^{+0.016}$	$0 . 034_{- 0.003}^{+ 0.008}$ $0.034_{-0.003}^{+0.008}$	$0 . 032_{- 0.007}^{+ 0.010}$ $0.032_{-0.007}^{+0.010}$

gabs (Fe XXV He-β)	LineE (keV)	$7 . 797_{- 0.016}^{+ 0.016}$ $7.797_{-0.016}^{+0.016}$	7.80 (fixed)	7.80 (fixed)
	Sigma (keV)	$0 . 070_{- 0.013}^{+ 0.016}$ $0.070_{-0.013}^{+0.016}$	0.06 (fixed)	0.06 (fixed)
	Strength (keV)	$0 . 062_{- 0.007}^{+ 0.006}$ $0.062_{-0.007}^{+0.006}$	$0 . 066_{- 0.006}^{+ 0.009}$ $0.066_{-0.006}^{+0.009}$	$0 . 060_{- 0.006}^{+ 0.006}$ $0.060_{-0.006}^{+0.006}$

gabs (Fe XXVI Ly-β)	LineE (keV)	$8 . 31_{- 0.025}^{+ 0.023}$ $8.31_{-0.025}^{+0.023}$	8.27 (fixed)	8.27 (fixed)
	Sigma (keV)	$0 . 20_{- 0.03}^{+ 0.02}$ $0.20_{-0.03}^{+0.02}$	0.19 (fixed)	0.19 (fixed)
	Strength (keV)	$0 . 11_{- 0.01}^{+ 0.01}$ $0.11_{-0.01}^{+0.01}$	$0 . 11_{- 0.01}^{+ 0.01}$ $0.11_{-0.01}^{+0.01}$	$0 . 10_{- 0.01}^{+ 0.01}$ $0.10_{-0.01}^{+0.01}$

edge (Fe XXV K-edge)	edgeE (keV)	$8 . 73_{- 0.02}^{+ 0.01}$ $8.73_{-0.02}^{+0.01}$	$8 . 70_{- 0.02}^{+ 0.03}$ $8.70_{-0.02}^{+0.03}$	$8 . 72_{- 0.01}^{+ 0.02}$ $8.72_{-0.01}^{+0.02}$
	MaxTau	$0 . 44_{- 0.01}^{+ 0.01}$ $0.44_{-0.01}^{+0.01}$	$0 . 49_{- 0.02}^{+ 0.03}$ $0.49_{-0.02}^{+0.03}$	$0 . 41_{- 0.01}^{+ 0.02}$ $0.41_{-0.01}^{+0.02}$

comptt (seed photon)	T₀ (keV)	0.24 ^(a)	0.23 ^(a)	0.24 ^(a)
	kT (keV)	$1 . 09_{- 0.01}^{+ 0.01}$ $1.09_{-0.01}^{+0.01}$	$1 . 05_{- 0.01}^{+ 0.01}$ $1.05_{-0.01}^{+0.01}$	$1 . 12_{- 0.01}^{+ 0.01}$ $1.12_{-0.01}^{+0.01}$
	τ₀	$49_{- 3}^{+ 2}$ $49_{-3}^{+2}$	50 (fixed)	50 (fixed)
	norm	$0 . 66_{- 0.02}^{+ 0.01}$ $0.66_{-0.02}^{+0.01}$	$0 . 59_{- 0.01}^{+ 0.01}$ $0.59_{-0.01}^{+0.01}$	$0 . 73_{- 0.01}^{+ 0.01}$ $0.73_{-0.01}^{+0.01}$

thcomp	τ	$5 . 0_{- 0.2}^{+ 0.3}$ $5.0_{-0.2}^{+0.3}$	$4 . 4_{- 0.3}^{+ 0.3}$ $4.4_{-0.3}^{+0.3}$	$6 . 0_{- 0.6}^{+ 0.2}$ $6.0_{-0.6}^{+0.2}$
	kT_e (keV)	$3 . 8_{- 0.1}^{+ 0.2}$ $3.8_{-0.1}^{+0.2}$	$4 . 3_{- 0.3}^{+ 0.2}$ $4.3_{-0.3}^{+0.2}$	$3 . 3_{- 0.2}^{+ 0.1}$ $3.3_{-0.2}^{+0.1}$
	f_cov	$1 . 00_{- 0.01}^{+ 0.01}$ $1.00_{-0.01}^{+0.01}$	1 (fixed)	1 (fixed)

Crabcorr	ΔΓ_FPMA	$0 . 23_{- 0.01}^{+ 0.01}$ $0.23_{-0.01}^{+0.01}$	$0 . 19_{- 0.03}^{+ 0.03}$ $0.19_{-0.03}^{+0.03}$	$0 . 25_{- 0.01}^{+ 0.03}$ $0.25_{-0.01}^{+0.03}$
(plabs)	K_FPMA	$1 . 53_{- 0.04}^{+ 0.03}$ $1.53_{-0.04}^{+0.03}$	$1 . 39_{- 0.07}^{+ 0.08}$ $1.39_{-0.07}^{+0.08}$	$1 . 58_{- 0.04}^{+ 0.09}$ $1.58_{-0.04}^{+0.09}$
	ΔΓ_FPMB	$0 . 22_{- 0.02}^{+ 0.01}$ $0.22_{-0.02}^{+0.01}$	$0 . 18_{- 0.03}^{+ 0.03}$ $0.18_{-0.03}^{+0.03}$	$0 . 25_{- 0.02}^{+ 0.02}$ $0.25_{-0.02}^{+0.02}$
	K_FPMB	$1 . 62_{- 0.05}^{+ 0.04}$ $1.62_{-0.05}^{+0.04}$	$1 . 34_{- 0.08}^{+ 0.08}$ $1.34_{-0.08}^{+0.08}$	$1 . 54_{- 0.07}^{+ 0.07}$ $1.54_{-0.07}^{+0.07}$

Fitting (System error 1%)	$χ_{red}^{2}$ $\chi_{\mathrm{red}}^{2}$ /d.o.f.	1.04/1027	1.12/685	1.06/740

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

^(a)

T₀ is linked to kT/2.7f_col, where f_col = 1.7.

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