Table 9.
Investigation of a narrow absorption feature in RGS1 data.
| obsida | S/N | kT∞ | EW1 | ϵ2 | σ2 | EW2 |
|---|---|---|---|---|---|---|
| (eV) | ||||||
| (A) | 45 |
 |
 |
 |
< 5 | 8 |
| (B) | 40 |
 |
70 | − | − | < 3 |
| (C) | 40 |
 |
70 | − | − | < 1.2 |
| (D) | 50 |
 |
< 100 | − | − | < 2.1 |
| 2012 | 50 |
 |
 |
 |
< 10 | 2.6 |
| 201 | 90 |
 |
< 60 | − | − | < 9 |
| 301 | 65 |
 |
50 | − | − | < 4 |
| 401 | 60 |
 |
< 50 | < 560 | < 10 | 2.4 |
| 501 | 60 |
 |
30 | − | − | < 9 |
| Old | 90 |
 |
70 | 575(4) |
 |
3 |
| New | 150 | 93(3) | 35 | < 560 |
 |
4 |
Notes. Errors are 1σ confidence levels. The model fitted to the data in XSPEC is tbabs(bbody-gauss-gauss). The subscripts “1” and “2” in the labels refer to the properties of the broad and narrow features, respectively. The energy, ϵ1 = 410 eV, and FWHM, σ1 = 100 eV, of the broad absorption feature, and the hydrogen column density, NH = 2.4 × 1020 cm−2, are held fixed during spectral fitting. The chi-squared values are within χ2 ∼ 25−50, for 76 degrees of freedom (NHP ∼100%).
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