Table 1
Recent cyclotron line energy measurements in Her X-1 by NuSTAR and INTEGRAL.
| Observation | 35 d | Center | Obs. line | Max. flux |
| month/year | cycle | MJD | energy [keV] | [ASM-cts/s] |
|
|
||||
| NuSTAR | ||||
| 21 Aug. 2016 | 468 | 57 621 | 37.29 ± 0.14 | 6.09 ± 0.18 |
| INTEGRAL | ||||
| 03–04 Apr. 2016 | 464 | 57 481 | 37.31 ± 0.81 | 6.16 ± 0.36 |
| 19–21 Aug. 2016 | 468 | 57 621 | 38.16 ± 0.70 | 6.09 ± 0.18 |
Notes. Uncertainties are at the 68% level. The maximum flux in the respective 35-day cycle is given in units of ASM-cts/s, referring to the All Sky Monitor of RXTE. The flux was actually measured by Swift/BAT and converted according to (2–10 keV) ASM−cts s-1 = 93.0 × (15–50 keV) BAT−cts cm-2 s-1 (Staubert et al. 2016). 35-day cycle numbering is according to Staubert et al. (1983).
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