We have developed a method to explore the detailed structure of the mean pulse profile of pulsars—namely, the Gaussian fit separation of the average profile (GFSAP) method—in which we model the total profile as a superposition of several Gaussian-shaped components. PSR B1451-68 has been observed at six frequencies, 170, 271, 400, 649, 950, and 1612 MHz, providing an excellent basis for a multifrequency analysis. Applying the GFSAP method to PSR 1451-68's ostensibly triple profile, we find strong evidence that it has five components in its profile. Based on this and other evidence, we conclude that PSR 1451-68 must be a member of the five-component (M) species. Benefiting from the separation, we are able to discuss the geometric properties of the three distinct emission zones: the core, the inner cone, and the outer cone. The first implies an inclination angle of 38°, and the 1 GHz widths of the conal radii are compatible with those found in 1993 by Rankin for the pulsar population at large. The radius of the outer cone increases markedly with decreasing frequency. Finally, the spectrum of the core component exhibits a strong break near 800 MHz and, probably, a turnover at about 150 MHz. At low frequency the core component dominates the pulsar's emission, whereas at high frequency the inner conal component pair is the strongest contributor to the emission.
展开▼
机译：我们已经开发出一种方法来探索脉冲星平均脉冲轮廓的详细结构，即平均轮廓的高斯拟合分离（GFSAP）方法，在该模型中，我们将总轮廓建模为几个高斯形分量的叠加。 PSR B1451-68已在170、271、400、649、950和1612 MHz六个频率上观察到，为多频率分析提供了极好的基础。将GFSAP方法应用于PSR 1451-68表面上的三重轮廓，我们发现有力的证据表明它的轮廓包含五个组成部分。基于此证据和其他证据，我们得出结论，PSR 1451-68必须是五组分（M）物种的成员。受益于分离，我们能够讨论三个不同发射区的几何特性：纤芯，内锥和外锥。第一个隐含着38°的倾斜角，圆锥半径的1 GHz宽度与Rankin在1993年发现的大部分脉冲星种群的宽度兼容。外锥的半径随着频率的降低而显着增加。最后，核心组件的频谱在800 MHz附近表现出很强的断裂能力，并且可能在150 MHz附近发生了周转。在低频时，核心成分主导脉冲星的发射，而在高频时，内部圆锥形成分对是最强的发射源。
展开▼
