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arXiv 0811.0843astro-ph
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用NICMOS进行高精度成像偏振测量

High Accuracy Imaging Polarimetry with NICMOS

D. Batcheldor, G. Schneider, D. C. Hines, G. D. Schmidt, D. J. Axon, A. Robinson, W. Sparks, C. Tadhunter

摘要:

NICMOS进行高精度偏振测定的能力目前受到未校准的剩余仪器偏振在1.2- 1.5%水平的阻碍。为了更好地量化和表征这一残差,我们获得了三个偏振标准恒星在三个不同的航天器滚转角的观测结果。结合档案数据,这些观测结果被用来表征剩余的仪器极化,使NICMOS达到其充分的极化潜力。使用这些数据,我们计算的并行传输系数,再现地面的结果极化标准的值。与平行透射系数相关的不确定性,观测的光度重复性的结果,主导了p和θ的准确性。然而,新的系数现在能够以+/-0.6%和+/-15度的精度对p~1.0%的目标进行成像偏振测量。

英文摘要:

The ability of NICMOS to perform high accuracy polarimetry is currently hampered by an uncalibrated residual instrumental polarization at a level of 1.2-1.5%. To better quantify and characterize this residual we obtained observations of three polarimetric standard stars at three separate space-craft roll angles. Combined with archival data, these observations were used to characterize the residual instrumental polarization to enable NICMOS to reach its full polarimetric potential. Using these data, we calculate values of the parallel transmission coefficients that reproduce the ground-based results for the polarimetric standards. The uncertainties associated with the parallel transmission coefficients, a result of the photometric repeatability of the observations, dominate the accuracy of p and theta. However, the new coefficients now enable imaging polarimetry of targets with p~1.0% at an accuracy of +/-0.6% and +/-15 degrees.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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