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Estimation of Confusion in SIM Targets With a Detailed Focal Plane Model

机译:详细焦平面模型估计SIM目标中的混淆

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The Space Interferometry Mission is an unique interferometer capable of performing narrow and wide angle astrometry on a few thousands of stars, distributed all over the Galaxy. It will be designed to achieve a single epoch precision of 10 micro arc seconds and an end of mission accuracy of 4 micro arc seconds in position and a similar accuracy in parallax and proper motions. The presence of confusing background and foreground stars might impose a limitation on the astrometric accuracy. We estimate the expected single measurement position uncertainty of the targets, owing to the presence of the confusing stars, from the knowledge of the dispositions and the spectral energy distributions (SEDs) of the stars within and just outside the field-of-view (FOV) of SIM. Our model also includes details of the instrumental parameters and the measurement process. The estimated uncertainties can in turn be used to correct the bias in the single measurement astrometric delay and, thus the final astrometric accuracy can be improved. We estimate the offsets from the zero delay position of the instrument and the projected separation of the components of binary stars in an elemental observation, following an one-dimensional synthesis imaging approach and a model fit to the absolute visibility data. These simulations help us to explore the strategies that can be followed to extract the details of the field through suitable model parameters in future.
机译:空间干涉测量特派团是一种独特的干涉仪,能够在几千颗恒星上进行狭窄和广角的星形,分布在星系上。它将旨在实现10个微电弧秒的单个时期精度,并且在位置的4微电弧秒的任务精度的结束以及视差和适当的运动中具有类似的准确性。令人困惑的背景和前景恒星的存在可能对天数精度施加限制。由于存在令人困惑的恒星,从令人困惑的明星的存在,令人困惑的恒星的存在和在视野范围之外的恒星(FOV)的情况下,估计目标的预期单一测量位置不确定性)sim。我们的模型还包括仪器参数和测量过程的详细信息。估计的不确定性又可以用于校正单个测量天体延迟中的偏差,因此可以提高最终的横梁精度。在一维合成成像方法和拟合到绝对可见性数据的模型之后,我们从仪器的零延迟位置和二元恒星组件的预计分离的偏移分离。这些模拟有助于我们探讨通过未来合适的模型参数提取现场细节的策略。

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