NGC 3259: A signal for an untapped population of slowly accreting intermediate-mass black holes

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Volume 702 (October 2025)

A&A, 702 (2025) A42

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Table 5.

Parameters of the best-fitting model for two XMM-Newton X-ray datasets.

Date/component	Γ	N_H	F_{0.2 − 10 keV}	L_{0.2 − 10 keV}	λ
		10²² cm⁻²	10⁻¹⁴ erg cm⁻² s⁻¹	10⁴⁰ erg s⁻¹	10⁻²

Const (soft)	$3 . 21_{- 0.40}^{+ 0.50}$ $3.21_{-0.40}^{+0.50}$	$0 . 10_{- 0.03}^{+ 0.05}$ $0.10_{-0.03}^{+0.05}$	$6 . 24_{- 3.82}^{+ 15.79}$ $6.24_{-3.82}^{+15.79}$	$0 . 54_{- 0.33}^{+ 1.38}$ $0.54_{-0.33}^{+1.38}$
2006-05-06	$0 . 74_{- 0.30}^{+ 0.32}$ $0.74_{-0.30}^{+0.32}$	$5 . 71_{- 1.74}^{+ 2.11}$ $5.71_{-1.74}^{+2.11}$	$9 . 37_{- 4.50}^{+ 9.94}$ $9.37_{-4.50}^{+9.94}$	$0 . 82_{- 0.39}^{+ 0.87}$ $0.82_{-0.39}^{+0.87}$	$0 . 49_{- 0.24}^{+ 0.52}$ $0.49_{-0.24}^{+0.52}$
2011-10-10			$20 . 07_{- 12.32}^{+ 21.07}$ $20.07_{-12.32}^{+21.07}$	$1 . 75_{- 1.07}^{+ 1.84}$ $1.75_{-1.07}^{+1.84}$	$1 . 05_{- 0.64}^{+ 1.10}$ $1.05_{-0.64}^{+1.10}$

Notes. Columns are: 1. Date of observation (for the hard component) or component name; 2. Powerlaw slope Γ; 3. Atomic hydrogen column density on the line of sight (N_H); 4. Unabsorbed flux in 0.2−10 keV band (F_{0.2 − 10 keV}); 5. Unabsorbed luminosity in 0.2−10 keV band (L_{0.2 − 10 keV}); 6. Eddington ratio for the hard component from unabsorbed fluxes (λ).

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