论文标题
持续积聚的脉冲频率波动
Pulse Frequency Fluctuations of Persistent Accretion Powered Pulsars
论文作者
论文摘要
在这项研究中，我们检查了持续Xray二进制的长期扭矩噪声波动，她的X-1，Vela X-1，GX 301-2，CEN X-3，CEN X-3，4U 1538-53，OAO 1657-415和4U 1626-67使用CGRO/BATSE/BATSE/BATSE/FERMI/FERMI/GBM/gBM。我们发现已知的磁盘馈电源在其功率密度光谱中显示出$ 1/ω^{2} $红色噪声组件，该光谱在长时间尺寸上饱和。另一方面，风馈电源形成了清晰的白噪声组件，而偶尔瞬时磁盘构成$ 1/ω$类型的闪烁噪声的风源。我们根据模型讨论他们的长期正时噪声特性，以描述用单色和有色噪声过程来描述脉冲频率衍生物波动的功率密度谱。此外，我们研究了测得的时间噪声强度与其他独立测量的物理参数之间的关系。尽管样品源数量较少，但我们建议这些来源的噪声强度与它们的亮度相关，并且与它们的磁场强度不相关，这意味着主要的噪声产生机制是积聚
In this study, we examine the long term torque noise fluctuations of persistent Xray binaries Her X-1, Vela X-1, GX 301-2, CEN X-3, 4U 1538-53, OAO 1657-415 and 4U 1626-67 using the historical pulse frequency measurements provided by CGRO/BATSE and Fermi/GBM. We find that known disk-fed sources exhibit $1/ω^{2}$ red noise component in their power density spectra which is saturated over long timescales. On the other hand, wind-fed sources form a clear white noise component and the wind-fed sources with occasional transient disk formation imprint $1/ω$ type flicker noise. We discuss their long-term timing noise properties based on the models to describe the power density spectrum of pulse frequency derivative fluctuations in terms of monochromatic and colored noise processes. Furthermore, we investigate the relation between measured timing noise strengths and other independently measured physical parameters. Despite the low number of sample sources, we suggest that noise strengths of these sources are correlated with their luminosities and uncorrelated with their magnetic fields strengths, implying that the dominant noise generating mechanism is accretion
