Table 2
Recent cyclotron line energy measurements during Main-Ons of Her X-1 by INTEGRAL, RXTE, Suzaku, and NuSTAR.
| Satellite | Observation | 35 d | Center | 35 d | observed | max. Flux | Flux normalized | References |
| year/month | cycle | [MJD] | phase | Ecyc [keV] | [ASM cts/s]1 | Ecyc [keV]3 | ||
|
|
||||||||
| RXTE | 2009 Feb. | 388 | 54 866.60 | 0.11 | 37.76 ± 0.70 | 5.94 ± 0.50 | 38.14 ± 0.71 | this work |
| Suzaku | 2005 Oct. | 353 | 53 648.00 | 0.11 | 38.70 ± 1.00 | 5.03 ± 0.20 | 39.47 ± 1.02 | Enoto et al. (2008) 2 |
| 2006 Mar. | 358 | 53 824.20 | 0.19 | 38.20 ± 1.00 | 4.70 ± 0.35 | 39.12 ± 1.02 | Enoto et al. (2008) 2 | |
| 2010 Sep. | 405 | 55 462.00 | 0.07 | 37.83 ± 0.22 | 7.56 ± 0.23 | 37.50 ± 0.22 | this work | |
| 2010 Sep. | 405 | 55 468.00 | 0.25 | 36.50 ± 1.05 | 7.56 ± 0.23 | 35.17 ± 1.04 | this work | |
| 2012 Sep. | 426 | 56 192.23 | 0.09 | 37.03 ± 0.50 | 6.60 ± 0.50 | 37.12 ± 0.50 | this work | |
| INTEGRAL | 2010 July | 403 | 55 390.00 | 0.05 | 37.50 ± 0.30 | 6.67 ± 0.20 | 37.56 ± 0.30 | this work |
| 2011 June | 413 | 55 738.26 | 0.08 | 37.34 ± 0.28 | 6.03 ± 0.20 | 37.68 ± 0.28 | this work | |
| 2007 July/Aug. | 373 | 54 348.00 | 0.25 | 36.50 ± 0.60 | 4.50 ± 0.48 | 37.51 ± 0.62 | this work | |
| 2011 July | 413 | 55 744.50 | 0.25 | 38.53 ± 0.78 | 7.00 ± 0.20 | 38.44 ± 0.78 | this work | |
| 2012 Aug. | 421 | 56 019.50 | 0.09 | 38.97 ± 0.38 | 5.03 ± 0.20 | 39.74 ± 0.39 | this work | |
| NuSTAR | 2012 Sep. | 426 | 56 192.20 | 0.09 | 37.33 ± 0.17 | 6.60 ± 0.20 | 37.42 ± 0.17 | Fürst et al. (2013) |
Notes. Uncertainties are at the 68% level. 35 d cycle numbering and 35 d phase is according to Staubert et al. (1983, 2013).
The maximum Main-On flux was determined using the monitoring data of RXTE/ASM and Swift/BAT (since 2012 from BAT only); the conversion is: (2–10 keV ASM-cts/s) = 89 × (15–50 keV BAT-cts cm-2 s-1).
The two Suzaku data points from 2005 and 2006 are from Enoto et al. (2008), adjusted to describing the cyclotron line by a Gaussian line profile (see text).
These values refer to this work: normalization to an ASM flux of 6.8 (ASM-cts/s) using the Ecyc/flux relationship (slope of 0.44 keV/ASM-cts/s) of the two-variable fit to the 1996–2012 data set (see Table 4).
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