Table 1.
Count rates, detection significance, unabsorbed X-ray flux and luminosity, and hardness ratio (HR) of L 98-59 in each of the XMM-Newton observations during the quiescent intervals.
| ObsID | Year | Exp. time | Signif. | SAS_ML | Rate | fX | LX | HR |
|---|---|---|---|---|---|---|---|---|
| (ks) | σ | 10−3 ct s−1 | 10−14 erg s−1 cm−2 | 1026 erg s−1 | ||||
| 0863400601 | 2020 | 27.2 | 15.6 | 100.16 | 3.93 ± 0.53 | 3.06 ± 0.41 | 4.13 ± 0.6 | –0.12 (–0.60–0.32) |
| 0871800201 | 2021 | 11.6 | 17.3 | 159.25 | 9.87 ± 1.21 | 7.66 ± 0.80 | 10.34 ± 1.1 | 0.14 (–0.20–0.46) |
| 0871800301 | 2021 | 10.2 | 12.1 | 65.9 | 7.78 ± 1.26 | 6.05 ± 0.77 | 8.16 ± 1.05 | 0.08 (–0.39–0.50) |
| (087180-Sum | 2021 | 21.8 | 20.3 | – | 7.84 ± 0.82 | 6.10 ± 0.98 | 8.23 ± 1.32 | 0.11 (–0.15 ÷ 0.38) ) |
| 0940540301 | 2024 | 34.0 | 5.3 | 11.44 | 0.56 ± 0.16 | 0.44 ± 0.13 | 0.59 ± 0.17 | –0.27 (–1.00–0.53) |
| 0940540401 | 2025 | 15.6 | 13.3 | 110.48 | 6.0 ± 0.9 | 4.71 ± 0.67 | 6.33 ± 0.9 | –0.04 (–0.37–0.261) |
Notes. Exposure time is the sum of MOS and pn exposure times in quiescent intervals. Significance is in units of σ of local background. SAS_ML is the maximum likelihood value of the source detection performed with SAS. Count rates are scaled to the MOS effective area. Unabsorbed fluxes in 0.3–10 keV band were determined assuming a 1T APEC thermal model with solar abundances, kT = 0.17 keV and NH = 1018 cm−2. Luminosities are calculated assuming a distance of 10.6 pc. HR calculated from pn counts in the bands S = 0.3 − 0.7 keV (soft) and H = 0.7 − 8.0 keV (hard). We report the measurements from the sum of the observations 0871800201 and 0871800301.
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