Table 3
Spectral analysis of the X-ray emission from the Arches star cluster and associated cloud region with standard XSPEC models.
(Unit) | Star cluster | Cloud region | |||
model 1 | model 2 | model 3 | model 1 | ||
|
|||||
NH(2) | (1022 H cm-2) | – | =NH(1) | 8.3![]() |
– |
kT(2) | (keV) | – | 0.27 ± 0.04 | 0.92![]() |
– |
Z / Z⊙ | – | 1.7 (fixed) | 1.7 (fixed) | – | |
IkT(2) | (see notes below) | – | 1100![]() |
13![]() |
– |
|
|||||
NH(1) | (1022 H cm-2) | 9.5 ± 0.3 | 12.0![]() |
12.8![]() |
11.3![]() |
|
|||||
kT(1) | (keV) | 1.79![]() |
1.61![]() |
1.78![]() |
2.2![]() |
Z / Z⊙ | 1.7 (fixed) | 1.7 (fixed) | 1.7 (fixed) | 1.7 (fixed) | |
IkT(1) | (see notes below) | 20.4 ± 1.8 | 30 ± 4 | 23![]() |
5.2![]() |
|
|||||
E6.4 keV | (keV) | 6.41 ± 0.02 | 6.40 ± 0.02 | 6.40 ± 0.02 | 6.409 ± 0.005 |
F6.4 keV | (10-6 ph cm-2 s-1) | 1.2 ± 0.3 | 1.3 ± 0.3 | 1.3 ± 0.3 | 8.7![]() |
|
|||||
Γ | 0.7 ± 0.4 | 0.4![]() |
0.8![]() |
1.6![]() |
|
I p.l. | (10-5 cm-2 s-1 keV-1) | 1.3![]() |
0.62![]() |
1.3![]() |
16![]() |
|
|||||
E W6.4 keV | (keV) | 0.4 ± 0.1 | 0.4 ± 0.1 | 0.4 ± 0.1 | 1.2 ± 0.2 |
|
|||||
χ2/d.o.f. | 1222/978 | 1152/976 | 1129/975 | 560/491 |
Notes. Model 1: WABS × (APEC + Gaussian + powerlaw); model 2: WABS × (APEC + APEC + Gaussian + powerlaw); model 3: WABS × APEC + WABS × (APEC + Gaussian + powerlaw). NH: absorption column density. kT, Z / Z⊙, and IkT: temperature, metallicity relative to solar, and normalization of the APEC thermal plasma (IkT is in unit of , where ne and nH are the electron and proton number densities (cm-3) and D the distance to the source in cm). E6.4 keV and F6.4 keV: centroid energy and flux of the neutral or low-ionization Fe Kα line. Γ and Ip.l.: index and normalization at 1 keV of the power-law component. EW6.4 keV: EW of the 6.4 keV line with respect to the power-law continuum. χ2/d.o.f.: χ2 per degree of freedom.
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