论文标题
改进的大面积X射线比例计数器（LAXPC）仪器的背景模型在板载Astrosat
Improved background model for the Large Area X-ray Proportional Counter (LAXPC) instrument on-board AstroSat
论文作者
论文摘要
我们为大面积X射线比例计数器（LAXPC）探测器提供了改进的背景模型。由于收集面积和高压较大，LAXPC仪器的背景计数速率很高，在轨道期间有所不同。除了在轨道期间具有纬度和经度的变化外，还有一个显着的准二个变化，尚未建模。使用超过5年的背景观察，我们确定了准抑制变化的周期为84495 s，并且使用此期间，可以考虑变化，并确定拟合不好的时间间隔。这些导致背景模型的显着改善。准二一个变化可以归因于近地球轨道中带电粒子通量的变化。
We present an improved background model for the Large Area X-ray Proportional Counter (LAXPC) detectors on-board AstroSat. Because of the large collecting area and high pressure, the LAXPC instrument has a large background count rate, which varies during the orbit. Apart from the variation with latitude and longitude during the orbit there is a prominent quasi-diurnal variation which has not been modelled earlier. Using over 5 years of background observations, we determined the period of the quasi-diurnal variation to be 84495 s and using this period, it is possible to account for the variation and also identify time intervals where the fit is not good. These lead to a significant improvement in the background model. The quasi-diurnal variation can be ascribed to the changes in charged particle flux in the near Earth orbit.
