EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 591 (July 2016) A&A, 591 (2016) A29 Full HTML
Free Access

Table 2

Best-fit models for the sample of sources analysed in this paper.

Source Cen X-3 (LL) Cen X-3 (HL) 4U 0115+63 (Obs. 1) 4U 0115+63 (Obs. 2) Her X-1
Parameter
Continuum and derived parameters
N H a 0.65 0.71 1.12 1.19 [ 10-4 ]
N H b 6.3 – 5.3 4.3± 0.9 –
Cov. Fract. 0.76 – 0.54 0.51 –
kTe (keV) 1.83 1.43 0.77 0.89 3.09
ṁ c 0.83 11.7 0.92 0.47 4.02
B 12 d 2.62 ± 0.09 2.51 ± 0.06 0.99 ± 0.01 0.97± 0.01 3.22± 0.02
σcyc (keV) [3] 1.6 ± 0.4 2.4 ± 0.3 2.3 ± 0.2 3.1 ± 0.4
R0 (km) 1.02 1.72 0.44 0.34 1.70
H (km) 7.3± 0.4 3.4 ± 0.2 2.5 ± 0.1 2.6 ± 0.1 4.6 ± 0.3
N comp [65] 65 ± 5 4.4 4.4 13 ± 2
Cyclotron absorption features
E1 (keV) 30 ± 1 29.1 ± 0.7 12.2 ± 0.1 11.9 ± 0.1 37.2 ± 0.2
σ1 (keV) [5] 6.0 1.7 ± 0.2 1.5 5.7
N 1 e 9 ± 2 7.4 0.9 0.6 ± 0.1 9.5
E2 (keV) – – 23.0 ± 0.2 22.6 ± 0.1 –
σ2 (keV) – – 2.1 2.0 ± 0.2 –
N 2 e – – 1.3 1.3 –
E3 (keV) – – 35.2 ± 0.6 36.0 –
σ3 (keV) – – [2] [2] –
N 3 e – – 1.3 0.4 ± 0.2 –
E4 (keV) – – 46.4 – –
σ4 (keV) – – 3.6 – –
N 4 e – – 2.0 – –
Iron emission line
EFe (keV) 6.58 ± 0.01 6.60 ± 0.03 – – 6.61 ± 0.03
σFe (keV) 0.33 ± 0.02 0.31 ± 0.05 – – 0.35
N Fe f 5.2 ± 0.2 8.7 – – 5.7
F cyc / F tot g 0.78 0.28 0.58 0.67 0.62
L X g,h 1.2 11.0 11.7 7.8 4.6
χ2/d.o.f. 449/312 167/238 363/415 583/522 3769/3727

Notes. For the compmag parameters, the emission geometry defined in Eq. (26) combined with velocity profile in Eq. (18) is assumed.

(a)

Absorption of the phabs model in units of 1022 cm-2.

(b)

Absorption of the pcfabs model in units of 1022 cm-2.

(c)

In units of 1.5 × 1017m gr s-1, with m = 1.4.

(d)

In units of 1012 G, and linked to the centroid of the scattering features: the fundamental for Her X-1 and Cen X-3, the first harmonic for 4U 0115+63.

(e)

Normalization corresponding to the parameter τn in Eq. (28).

(f)

In units of 10-3 photons cm-2.

(g)

Computed in the energy range 0.5–100 keV for Cen X-3 and 4U 0115+63, 3–100 keV for Her X-1, and corrected for absorption.

(h)

In units of 1037 erg s-1 assuming a distances of 8 kpc, 7.5 kpc, and 6.5 kpc for Cen X-3, 4U 0115+63, and Her X-1, respectively.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.