Table 1.
Constraints on the spectral fits to the nine supersoft sources.
| Lab. | Date | Blackbody |
Powerlaw |
Blackbody+powerlaw |
log10L | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| C/ν | kT | C/ν | NH | Γ | C/ν | kT | Γ | |||
| D1 | 2010-8-20 | 155/162 |
 |
179/162 | 0.0 |
 |
159/160 |
 |
 |
 |
| 2013-8-17 |
 |
|||||||||
| 2015-5-30 | ||||||||||
| D2 | 2007-1-8 | 281/267 |
 |
279/267 | 0.0 |
 |
278/265 | 0.12 |
 |
 |
| 2008-7-3 | ||||||||||
| 2015-2-6 |
 |
|||||||||
| P1 | 2011-5-8 | 104/49 |
 |
106/49 | 0.0 |
 |
87/47 |
 |
 |
 |
| P2 | 2004-7-7 | 39/51 |
 |
34/50 |
 |
 |
– | – | – |
 |
| 2010-12-8 | 375/158 |
 |
292/158 | 0.0 |
 |
182/155 |
 |
 |
 |
|
| 2010-12-16 |
 |
|||||||||
| 2010-12-18 | ||||||||||
| P3 | 2001-7-4 | 126/140 |
 |
134/140 | 0.0 |
 |
164/138 |
 |
 |
 |
| 2016-7-30 |
 |
 |
 |
|||||||
| 2016-8-13 |
 |
 |
 |
|||||||
| 2017-1-4 | 0.12 | 3.0 | ||||||||
| T1 | 2006-11-29 | 104/92 |
 |
110/91 |
 |
 |
101/89 |
 |
 |
 |
| T2 | 2018-1-6 | 97/95 |
 |
112/95 | 0.0 |
 |
124/93 |
 |
 |
 |
| T3 | 2009-10-31 | – | – | – | – | – | – | – | – | 42.56 |
| 2012-12-3 | 51/41 |
 |
70/41 | 0.0 |
 |
45/39 |
 |
 |
 |
|
| T4 | 2010-8-8 | 224/234 |
 |
230/234 | 0.0 |
 |
224/233 |
 |
3.0 |
 |
| 2022-1-17 |
 |
|||||||||
Notes. The quantities in italics are fixed during the fit procedure; boldface indicates the statistically favoured model. C is the value of C-statistic and ν are the degrees of freedom. The blackbody temperature is in keV, the intrinsic absorption hydrogen column density is in units of 1020 atoms cm−2. The intrinsic absorption columns are omitted for the blackbody model and blackbody+powerlaw models as no intrinsic absorption was required in any source. The unabsorbed luminosity, expressed in erg/s, is computed over the 0.5 − 2 keV range and adopts the best-fitting model. The luminosity of the first observation of the source labelled T3 is a 3σ upper limit. The uncertainties reported correspond to a change in the fit statistics of ΔC = 1.
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