论文标题
CEN X-3中回旋线能量的新测量
New measurements of the cyclotron line energy in Cen X-3
论文作者
论文摘要
我们报告了来自两个观测值的数据分析的结果，该数据对宽带X射线观测器Suzaku和Nustar进行了二进制X射线Pulsar CEN X-3。脉冲轮廓由一个宽的单个峰支配，并显示出一些能量依赖性，而在15和25 KEV以下的能量分别为两个额外的弱脉冲峰。用于Suzaku的0.8-60.0 keV的宽带X射线频谱和Nustar的3.0-60.0 KeV与高能量截止的强力法模型一起拟合，以及软孔，多个铁发射线和旋风吸收。发现回旋线能量为$ 30.29^{+0.68} _ { - 0.61} $ keV和$ 29.22^{+0.28} _ { - 0.27} $ kev在Suzaku和Nustar Spectra中。我们将这两种测量值与用牙龈，bepposax和RXTE获得的CEN X-3中的CRSF进行了比较。我们没有发现CRSF对光度的依赖性的证据。除了用bepposax进行一次CRSF测量外，其余的测量与CRSF的能量在29.5-30.0 keV范围内的亮度范围为1.1-5.4 $ \ times 10^{37} $ ergs s $^{ - 1} $与其他几个来源相同的crsf variforition cons umin uminsf varriviation cons uminsf ins umin crssf ins umInIn conse crsf varifier的范围为1.1-5.4 $ \ times 10^{37} $ ergs s $^{-1} $。
We report results from the analysis of data from two observations of the accreting binary X-ray pulsar Cen X-3 carried out with the broadband X-ray observatories Suzaku and NuSTAR. The pulse profile is dominated by a broad single peak and show some energy dependence with two additional weak pulse peaks at energies below 15 and 25 keV respectively. The broadband X-ray spectrum for 0.8-60.0 keV for Suzaku and 3.0-60.0 keV for NuSTAR is fitted well with high energy cut-off power-law model along with soft-excess, multiple iron emission lines and a cyclotron absorption. The cyclotron line energy is found to be $30.29^{+0.68}_{-0.61}$ keV and $29.22^{+0.28}_{-0.27}$ keV respectively in the Suzaku and NuSTAR spectra. We make a comparison of these two measurements with four previous measurements of CRSF in Cen X-3 obtained with Ginga, BeppoSAX and RXTE. We find no evidence for a dependence of the CRSF on luminosity. Except for one CRSF measurement with BeppoSAX, the remaining measurements are consistent with a CRSF energy in the range of 29.5 - 30.0 keV over a luminosity range of 1.1-5.4 $\times 10^{37}$ ergs s$^{-1}$ different from several other sources that show considerable CRSF variation in the same luminosity range.
