Energy spectral parameters of Suzaku (combined spectra of XIS (0.8–10 keV) and HXD/PIN (15–35 keV)) and NuSTAR + Swift (combined spectra of NuSTAR and Swift/XRT), fitted with different model combinations. Quoted errors are at 90 per cent confidence level.
| Component . | Parameter . | Suzaku . | NuSTAR + Swift/XRT . | . | ||||
|---|---|---|---|---|---|---|---|---|
| . | . | Model 0A . | Model 3A . | Model 3B . | Model 0A . | Model 0B . | Model 3A . | Model 3B . |
| . | . | (+2 edges) . | (+2 edges) . | (+2 edges) . | . | . | . | . |
| tbabs | NH(× 1022 cm−2) | 0.19 ± 0.004 | 0.18 ± 0.004 | 0.21 ± 0.03 | 0.15 (f) | 0.15 (f) | 0.16 (f) | 0.15 (f) |
| edge(1) | Eedge | 7.67 ± 0.14 | 7.67 ± 0.13 | 7.66 ± 0.14 | – | – | – | – |
| τmax (× 10−2) | 3.4 ± 1.1 | 3.6 ± 1.0 | |$3.2_{-1.1}^{+0.6}$| | – | – | – | – | |
| edge(2) | Eedge | 6.93 ± 0.07 | 6.92 ± 0.06 | 6.92 ± 0.07 | – | – | – | – |
| τmax (× 10−2) | 3.3 ± 1.0 | 3.6 ± 0.9 | |$3.4_{-0.5}^{+0.9}$| | – | – | – | – | |
| diskbb | kTdisc(keV) | 0.93 ± 0.03 | 0.98 ± 0.03 | |$0.44_{-0.06}^{+0.10}$| | |$0.66_{-0.07}^{+0.09}$| | – | |$0.85_{-0.17}^{+0.09}$| | 0.84 ± 0.08 |
| NDBBa | 142 ± 5 | |$115_{-109}^{+45}$| | |$1951_{-942}^{+1421}$| | 105.5|$^{+50.5}_{-36.9}$| | – | |$160_{-39}^{+67}$| | |$183_{-65}^{+72}$| | |
| blackbody | kTbb( keV) | – | |$2.46_{-0.08}^{+0.04}$| | 0.65 ± 0.05 | – | 0.53±0.04 | |$1.64_{-0.28}^{+0.23}$| | |$1.59_{-0.05}^{+0.07}$| |
| NBBb(× 10−2) | – | |$6.04_{-1.40}^{+0.91}$| | |$1.35_{-0.17}^{+0.19}$| | – | 0.25 ± 0.01 | |$1.50_{-0.50}^{+2.30}$| | |$1.10_{-0.40}^{+1.90}$| | |
| nthcomp | Γ | 1.43 ± 0.03 | |$2.16_{-0.93}^{+1.50}$| | 1.47 ± 0.04 | 1.78 ± 0.03 | 1.77 ± 0.03 | |$1.58_{-0.05}^{+0.22}$| | |$1.97_{-0.25}^{+0.15}$| |
| kTe (keV) | 2.80 ± 0.02 | ≥2.08 | 2.82 ± 0.02 | 2.95 ± 0.04 | |$2.93_{-0.04}^{+0.02}$| | |$3.04_{-0.22}^{+0.15}$| | |$2.98_{-0.19}^{+0.25}$| | |
| kTseed (keV) | =kTdisc | =kTdisc | =kTbb | =kTdisc | =kTbb | =kTdisc | =kTbb | |
| inp type | 1.0(f) | 1.0 (f) | 0.0 (f) | 1.0 (f) | 0.0(f) | 1.0 (f) | 0.0(f) | |
| nnthcompc | 0.38 ± 0.04 | 0.37 ± 0.11 | 0.22 ± 0.05 | |$0.42_{-0.11}^{+0.33}$| | |$0.48_{-0.05}^{+0.03}$| | 0.11 ± 0.05 | 0.05 ± 0.02 | |
| diskbb | Rin(km) | 10.3 ± 0.2 | |$9.3^{+1.9}_{-6.1}$| | |$38.3^{+12.0}_{-10.8}$| | |$8.9^{+1.9}_{-1.7}$| | – | |$11.0^{+2.1}_{-1.5}$| | |$11.7^{+2.1}_{-2.3}$| |
| fdiskbb(× 10−9 cgs) | 2.3 ± 0.01 | 2.4 ± 0.01 | 1.6 ± 0.01 | 0.4 ± 0.05 | – | 1.8 ± 0.07 | 2.1 ± 0.05 | |
| fbb(× 10−9 cgs) | – | 5.1 ± 0.01 | 1.2 ± 0.01 | – | 0.21 ± 0.03 | 1.3 ± 0.08 | 1.6 ± 0.07 | |
| BB area fractiond | Abb | – | 0.08 ± 0.01 | 3.68 ± 0.98 | – | 1.45 ± 0.37 | 0.10 ± 0.04 | 0.14 ± 0.02 |
| fseed(× 10−9 cgs) | 2.2 ± 0.01 | 1.9 ± 0.01 | 3.4 ± 0.01 | 1.7 ± 0.05 | 2.2 ± 0.03 | 0.5 ± 0.07 | 0.9 ± 0.05 | |
| fnthcomp(× 10−9 cgs) | 9.1 ± 0.02 | 4.2 ± 0.01 | 8.8 ± 0.02 | 4.9 ± 0.02 | 5.5 ± 0.01 | 2.7 ± 0.01 | 2.4 ± 0.01 | |
| Amp. fac.e | A | 4.1 ± 0.01 | 2.2 ± 0.01 | 2.6 ± 0.002 | 2.9 ± 0.07 | 2.5 ± 0.03 | 4.5 ± 0.74 | 2.6 ± 0.14 |
| χ2/dof | 436.6/328 | 405/326 | 430/326 | 717/701 | 716/701 | 712/699 | 711/699 | |
| Component . | Parameter . | Suzaku . | NuSTAR + Swift/XRT . | . | ||||
|---|---|---|---|---|---|---|---|---|
| . | . | Model 0A . | Model 3A . | Model 3B . | Model 0A . | Model 0B . | Model 3A . | Model 3B . |
| . | . | (+2 edges) . | (+2 edges) . | (+2 edges) . | . | . | . | . |
| tbabs | NH(× 1022 cm−2) | 0.19 ± 0.004 | 0.18 ± 0.004 | 0.21 ± 0.03 | 0.15 (f) | 0.15 (f) | 0.16 (f) | 0.15 (f) |
| edge(1) | Eedge | 7.67 ± 0.14 | 7.67 ± 0.13 | 7.66 ± 0.14 | – | – | – | – |
| τmax (× 10−2) | 3.4 ± 1.1 | 3.6 ± 1.0 | |$3.2_{-1.1}^{+0.6}$| | – | – | – | – | |
| edge(2) | Eedge | 6.93 ± 0.07 | 6.92 ± 0.06 | 6.92 ± 0.07 | – | – | – | – |
| τmax (× 10−2) | 3.3 ± 1.0 | 3.6 ± 0.9 | |$3.4_{-0.5}^{+0.9}$| | – | – | – | – | |
| diskbb | kTdisc(keV) | 0.93 ± 0.03 | 0.98 ± 0.03 | |$0.44_{-0.06}^{+0.10}$| | |$0.66_{-0.07}^{+0.09}$| | – | |$0.85_{-0.17}^{+0.09}$| | 0.84 ± 0.08 |
| NDBBa | 142 ± 5 | |$115_{-109}^{+45}$| | |$1951_{-942}^{+1421}$| | 105.5|$^{+50.5}_{-36.9}$| | – | |$160_{-39}^{+67}$| | |$183_{-65}^{+72}$| | |
| blackbody | kTbb( keV) | – | |$2.46_{-0.08}^{+0.04}$| | 0.65 ± 0.05 | – | 0.53±0.04 | |$1.64_{-0.28}^{+0.23}$| | |$1.59_{-0.05}^{+0.07}$| |
| NBBb(× 10−2) | – | |$6.04_{-1.40}^{+0.91}$| | |$1.35_{-0.17}^{+0.19}$| | – | 0.25 ± 0.01 | |$1.50_{-0.50}^{+2.30}$| | |$1.10_{-0.40}^{+1.90}$| | |
| nthcomp | Γ | 1.43 ± 0.03 | |$2.16_{-0.93}^{+1.50}$| | 1.47 ± 0.04 | 1.78 ± 0.03 | 1.77 ± 0.03 | |$1.58_{-0.05}^{+0.22}$| | |$1.97_{-0.25}^{+0.15}$| |
| kTe (keV) | 2.80 ± 0.02 | ≥2.08 | 2.82 ± 0.02 | 2.95 ± 0.04 | |$2.93_{-0.04}^{+0.02}$| | |$3.04_{-0.22}^{+0.15}$| | |$2.98_{-0.19}^{+0.25}$| | |
| kTseed (keV) | =kTdisc | =kTdisc | =kTbb | =kTdisc | =kTbb | =kTdisc | =kTbb | |
| inp type | 1.0(f) | 1.0 (f) | 0.0 (f) | 1.0 (f) | 0.0(f) | 1.0 (f) | 0.0(f) | |
| nnthcompc | 0.38 ± 0.04 | 0.37 ± 0.11 | 0.22 ± 0.05 | |$0.42_{-0.11}^{+0.33}$| | |$0.48_{-0.05}^{+0.03}$| | 0.11 ± 0.05 | 0.05 ± 0.02 | |
| diskbb | Rin(km) | 10.3 ± 0.2 | |$9.3^{+1.9}_{-6.1}$| | |$38.3^{+12.0}_{-10.8}$| | |$8.9^{+1.9}_{-1.7}$| | – | |$11.0^{+2.1}_{-1.5}$| | |$11.7^{+2.1}_{-2.3}$| |
| fdiskbb(× 10−9 cgs) | 2.3 ± 0.01 | 2.4 ± 0.01 | 1.6 ± 0.01 | 0.4 ± 0.05 | – | 1.8 ± 0.07 | 2.1 ± 0.05 | |
| fbb(× 10−9 cgs) | – | 5.1 ± 0.01 | 1.2 ± 0.01 | – | 0.21 ± 0.03 | 1.3 ± 0.08 | 1.6 ± 0.07 | |
| BB area fractiond | Abb | – | 0.08 ± 0.01 | 3.68 ± 0.98 | – | 1.45 ± 0.37 | 0.10 ± 0.04 | 0.14 ± 0.02 |
| fseed(× 10−9 cgs) | 2.2 ± 0.01 | 1.9 ± 0.01 | 3.4 ± 0.01 | 1.7 ± 0.05 | 2.2 ± 0.03 | 0.5 ± 0.07 | 0.9 ± 0.05 | |
| fnthcomp(× 10−9 cgs) | 9.1 ± 0.02 | 4.2 ± 0.01 | 8.8 ± 0.02 | 4.9 ± 0.02 | 5.5 ± 0.01 | 2.7 ± 0.01 | 2.4 ± 0.01 | |
| Amp. fac.e | A | 4.1 ± 0.01 | 2.2 ± 0.01 | 2.6 ± 0.002 | 2.9 ± 0.07 | 2.5 ± 0.03 | 4.5 ± 0.74 | 2.6 ± 0.14 |
| χ2/dof | 436.6/328 | 405/326 | 430/326 | 717/701 | 716/701 | 712/699 | 711/699 | |
Spectral models – Model 0A: TBabs×(diskbb + nthcomp); Model 0B: TBabs×(bbody + nthcomp); Model 3A: TBabs×(diskbb + bbody + nthcomp) with kTseed = kTdisc; Model 3B: TBabs×(diskbb + blackbody + nthcomp) with kTseed = kTbb
Model 3A/3B(+2 edges): TBabs×edge×edge(diskbb + blackbody + nthcomp) with kTseed = kTdisc/kTseed = kTbb.
a, b, cNormalization parameter of the diskbb, blackbody and nthcomp component, respectively.
dBB area fraction is the fraction of the NS surface area that is emitting as a blackbody (assuming a 10 km radius of the NS.)
eAmplification factor which is the ratio of the Comptonized luminosity to the seed photon luminosity.
Energy spectral parameters of Suzaku (combined spectra of XIS (0.8–10 keV) and HXD/PIN (15–35 keV)) and NuSTAR + Swift (combined spectra of NuSTAR and Swift/XRT), fitted with different model combinations. Quoted errors are at 90 per cent confidence level.
| Component . | Parameter . | Suzaku . | NuSTAR + Swift/XRT . | . | ||||
|---|---|---|---|---|---|---|---|---|
| . | . | Model 0A . | Model 3A . | Model 3B . | Model 0A . | Model 0B . | Model 3A . | Model 3B . |
| . | . | (+2 edges) . | (+2 edges) . | (+2 edges) . | . | . | . | . |
| tbabs | NH(× 1022 cm−2) | 0.19 ± 0.004 | 0.18 ± 0.004 | 0.21 ± 0.03 | 0.15 (f) | 0.15 (f) | 0.16 (f) | 0.15 (f) |
| edge(1) | Eedge | 7.67 ± 0.14 | 7.67 ± 0.13 | 7.66 ± 0.14 | – | – | – | – |
| τmax (× 10−2) | 3.4 ± 1.1 | 3.6 ± 1.0 | |$3.2_{-1.1}^{+0.6}$| | – | – | – | – | |
| edge(2) | Eedge | 6.93 ± 0.07 | 6.92 ± 0.06 | 6.92 ± 0.07 | – | – | – | – |
| τmax (× 10−2) | 3.3 ± 1.0 | 3.6 ± 0.9 | |$3.4_{-0.5}^{+0.9}$| | – | – | – | – | |
| diskbb | kTdisc(keV) | 0.93 ± 0.03 | 0.98 ± 0.03 | |$0.44_{-0.06}^{+0.10}$| | |$0.66_{-0.07}^{+0.09}$| | – | |$0.85_{-0.17}^{+0.09}$| | 0.84 ± 0.08 |
| NDBBa | 142 ± 5 | |$115_{-109}^{+45}$| | |$1951_{-942}^{+1421}$| | 105.5|$^{+50.5}_{-36.9}$| | – | |$160_{-39}^{+67}$| | |$183_{-65}^{+72}$| | |
| blackbody | kTbb( keV) | – | |$2.46_{-0.08}^{+0.04}$| | 0.65 ± 0.05 | – | 0.53±0.04 | |$1.64_{-0.28}^{+0.23}$| | |$1.59_{-0.05}^{+0.07}$| |
| NBBb(× 10−2) | – | |$6.04_{-1.40}^{+0.91}$| | |$1.35_{-0.17}^{+0.19}$| | – | 0.25 ± 0.01 | |$1.50_{-0.50}^{+2.30}$| | |$1.10_{-0.40}^{+1.90}$| | |
| nthcomp | Γ | 1.43 ± 0.03 | |$2.16_{-0.93}^{+1.50}$| | 1.47 ± 0.04 | 1.78 ± 0.03 | 1.77 ± 0.03 | |$1.58_{-0.05}^{+0.22}$| | |$1.97_{-0.25}^{+0.15}$| |
| kTe (keV) | 2.80 ± 0.02 | ≥2.08 | 2.82 ± 0.02 | 2.95 ± 0.04 | |$2.93_{-0.04}^{+0.02}$| | |$3.04_{-0.22}^{+0.15}$| | |$2.98_{-0.19}^{+0.25}$| | |
| kTseed (keV) | =kTdisc | =kTdisc | =kTbb | =kTdisc | =kTbb | =kTdisc | =kTbb | |
| inp type | 1.0(f) | 1.0 (f) | 0.0 (f) | 1.0 (f) | 0.0(f) | 1.0 (f) | 0.0(f) | |
| nnthcompc | 0.38 ± 0.04 | 0.37 ± 0.11 | 0.22 ± 0.05 | |$0.42_{-0.11}^{+0.33}$| | |$0.48_{-0.05}^{+0.03}$| | 0.11 ± 0.05 | 0.05 ± 0.02 | |
| diskbb | Rin(km) | 10.3 ± 0.2 | |$9.3^{+1.9}_{-6.1}$| | |$38.3^{+12.0}_{-10.8}$| | |$8.9^{+1.9}_{-1.7}$| | – | |$11.0^{+2.1}_{-1.5}$| | |$11.7^{+2.1}_{-2.3}$| |
| fdiskbb(× 10−9 cgs) | 2.3 ± 0.01 | 2.4 ± 0.01 | 1.6 ± 0.01 | 0.4 ± 0.05 | – | 1.8 ± 0.07 | 2.1 ± 0.05 | |
| fbb(× 10−9 cgs) | – | 5.1 ± 0.01 | 1.2 ± 0.01 | – | 0.21 ± 0.03 | 1.3 ± 0.08 | 1.6 ± 0.07 | |
| BB area fractiond | Abb | – | 0.08 ± 0.01 | 3.68 ± 0.98 | – | 1.45 ± 0.37 | 0.10 ± 0.04 | 0.14 ± 0.02 |
| fseed(× 10−9 cgs) | 2.2 ± 0.01 | 1.9 ± 0.01 | 3.4 ± 0.01 | 1.7 ± 0.05 | 2.2 ± 0.03 | 0.5 ± 0.07 | 0.9 ± 0.05 | |
| fnthcomp(× 10−9 cgs) | 9.1 ± 0.02 | 4.2 ± 0.01 | 8.8 ± 0.02 | 4.9 ± 0.02 | 5.5 ± 0.01 | 2.7 ± 0.01 | 2.4 ± 0.01 | |
| Amp. fac.e | A | 4.1 ± 0.01 | 2.2 ± 0.01 | 2.6 ± 0.002 | 2.9 ± 0.07 | 2.5 ± 0.03 | 4.5 ± 0.74 | 2.6 ± 0.14 |
| χ2/dof | 436.6/328 | 405/326 | 430/326 | 717/701 | 716/701 | 712/699 | 711/699 | |
| Component . | Parameter . | Suzaku . | NuSTAR + Swift/XRT . | . | ||||
|---|---|---|---|---|---|---|---|---|
| . | . | Model 0A . | Model 3A . | Model 3B . | Model 0A . | Model 0B . | Model 3A . | Model 3B . |
| . | . | (+2 edges) . | (+2 edges) . | (+2 edges) . | . | . | . | . |
| tbabs | NH(× 1022 cm−2) | 0.19 ± 0.004 | 0.18 ± 0.004 | 0.21 ± 0.03 | 0.15 (f) | 0.15 (f) | 0.16 (f) | 0.15 (f) |
| edge(1) | Eedge | 7.67 ± 0.14 | 7.67 ± 0.13 | 7.66 ± 0.14 | – | – | – | – |
| τmax (× 10−2) | 3.4 ± 1.1 | 3.6 ± 1.0 | |$3.2_{-1.1}^{+0.6}$| | – | – | – | – | |
| edge(2) | Eedge | 6.93 ± 0.07 | 6.92 ± 0.06 | 6.92 ± 0.07 | – | – | – | – |
| τmax (× 10−2) | 3.3 ± 1.0 | 3.6 ± 0.9 | |$3.4_{-0.5}^{+0.9}$| | – | – | – | – | |
| diskbb | kTdisc(keV) | 0.93 ± 0.03 | 0.98 ± 0.03 | |$0.44_{-0.06}^{+0.10}$| | |$0.66_{-0.07}^{+0.09}$| | – | |$0.85_{-0.17}^{+0.09}$| | 0.84 ± 0.08 |
| NDBBa | 142 ± 5 | |$115_{-109}^{+45}$| | |$1951_{-942}^{+1421}$| | 105.5|$^{+50.5}_{-36.9}$| | – | |$160_{-39}^{+67}$| | |$183_{-65}^{+72}$| | |
| blackbody | kTbb( keV) | – | |$2.46_{-0.08}^{+0.04}$| | 0.65 ± 0.05 | – | 0.53±0.04 | |$1.64_{-0.28}^{+0.23}$| | |$1.59_{-0.05}^{+0.07}$| |
| NBBb(× 10−2) | – | |$6.04_{-1.40}^{+0.91}$| | |$1.35_{-0.17}^{+0.19}$| | – | 0.25 ± 0.01 | |$1.50_{-0.50}^{+2.30}$| | |$1.10_{-0.40}^{+1.90}$| | |
| nthcomp | Γ | 1.43 ± 0.03 | |$2.16_{-0.93}^{+1.50}$| | 1.47 ± 0.04 | 1.78 ± 0.03 | 1.77 ± 0.03 | |$1.58_{-0.05}^{+0.22}$| | |$1.97_{-0.25}^{+0.15}$| |
| kTe (keV) | 2.80 ± 0.02 | ≥2.08 | 2.82 ± 0.02 | 2.95 ± 0.04 | |$2.93_{-0.04}^{+0.02}$| | |$3.04_{-0.22}^{+0.15}$| | |$2.98_{-0.19}^{+0.25}$| | |
| kTseed (keV) | =kTdisc | =kTdisc | =kTbb | =kTdisc | =kTbb | =kTdisc | =kTbb | |
| inp type | 1.0(f) | 1.0 (f) | 0.0 (f) | 1.0 (f) | 0.0(f) | 1.0 (f) | 0.0(f) | |
| nnthcompc | 0.38 ± 0.04 | 0.37 ± 0.11 | 0.22 ± 0.05 | |$0.42_{-0.11}^{+0.33}$| | |$0.48_{-0.05}^{+0.03}$| | 0.11 ± 0.05 | 0.05 ± 0.02 | |
| diskbb | Rin(km) | 10.3 ± 0.2 | |$9.3^{+1.9}_{-6.1}$| | |$38.3^{+12.0}_{-10.8}$| | |$8.9^{+1.9}_{-1.7}$| | – | |$11.0^{+2.1}_{-1.5}$| | |$11.7^{+2.1}_{-2.3}$| |
| fdiskbb(× 10−9 cgs) | 2.3 ± 0.01 | 2.4 ± 0.01 | 1.6 ± 0.01 | 0.4 ± 0.05 | – | 1.8 ± 0.07 | 2.1 ± 0.05 | |
| fbb(× 10−9 cgs) | – | 5.1 ± 0.01 | 1.2 ± 0.01 | – | 0.21 ± 0.03 | 1.3 ± 0.08 | 1.6 ± 0.07 | |
| BB area fractiond | Abb | – | 0.08 ± 0.01 | 3.68 ± 0.98 | – | 1.45 ± 0.37 | 0.10 ± 0.04 | 0.14 ± 0.02 |
| fseed(× 10−9 cgs) | 2.2 ± 0.01 | 1.9 ± 0.01 | 3.4 ± 0.01 | 1.7 ± 0.05 | 2.2 ± 0.03 | 0.5 ± 0.07 | 0.9 ± 0.05 | |
| fnthcomp(× 10−9 cgs) | 9.1 ± 0.02 | 4.2 ± 0.01 | 8.8 ± 0.02 | 4.9 ± 0.02 | 5.5 ± 0.01 | 2.7 ± 0.01 | 2.4 ± 0.01 | |
| Amp. fac.e | A | 4.1 ± 0.01 | 2.2 ± 0.01 | 2.6 ± 0.002 | 2.9 ± 0.07 | 2.5 ± 0.03 | 4.5 ± 0.74 | 2.6 ± 0.14 |
| χ2/dof | 436.6/328 | 405/326 | 430/326 | 717/701 | 716/701 | 712/699 | 711/699 | |
Spectral models – Model 0A: TBabs×(diskbb + nthcomp); Model 0B: TBabs×(bbody + nthcomp); Model 3A: TBabs×(diskbb + bbody + nthcomp) with kTseed = kTdisc; Model 3B: TBabs×(diskbb + blackbody + nthcomp) with kTseed = kTbb
Model 3A/3B(+2 edges): TBabs×edge×edge(diskbb + blackbody + nthcomp) with kTseed = kTdisc/kTseed = kTbb.
a, b, cNormalization parameter of the diskbb, blackbody and nthcomp component, respectively.
dBB area fraction is the fraction of the NS surface area that is emitting as a blackbody (assuming a 10 km radius of the NS.)
eAmplification factor which is the ratio of the Comptonized luminosity to the seed photon luminosity.
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