标题： 盖亚近红外：关于处理和光度学的注记 显示英文标题

标题： GaiaNIR: Note on processing and photometry

摘要： 提出了一些关于载荷处理和天文测量卫星光电测光的想法，特别是为可能于2045年作为盖亚卫星继任者的GaiaNIR设计的。 - 如果实施探测器数据的建议初始处理，则GaiaNIR的灵敏度会提高，图像重叠减少，并且PSF校准更简单，因为跨扫描方向的拖尾效应将变得微不足道。 - 高角分辨率所需的滤波器测光对于天文学和天体物理学的原因是必需的。 低色散光谱受到质疑，因为在高恒星密度下它们表现不佳。 由于预计GaiaNIR的恒星数量更多，这将成为一个比Gaia更大的问题。 本文的目的在于以书面形式收集所有关于GaiaNIR测光的所有论据，以便与读者交流。 为了定义卫星上的测光设备，还需要进一步定量评估和比较各种选项。 最后，1) 滤光片的一个优点是，测光观测也可以用于天文学； 2) Gaia中的XP光谱将为大约4亿颗G <~ 18.5等单星提供非常好的天体物理数据，但滤光片对于所有较暗的星以及所有多重星会更好； 3) 目前尚不清楚在近红外低色散光谱相对于滤光片对天文学有哪些优势。 显示英文摘要

摘要： Some ideas for onboard processing and photometry with an astrometry satellite are presented, especially designed for GaiaNIR which may be launched about 2045 as a successor of Gaia. - Increased sensitivity, reduced image overlap, and simpler PSF calibration in GaiaNIR will result if the proposed initial processing of data from the detectors is implemented, because the across-scan smearing will become insignificant. - Filter photometry is required for high angular resolution as needed for astrometric and astrophysical reasons. Low-dispersion spectra are questioned because they fail at high star density. This will be a much greater problem with GaiaNIR than it is with Gaia because of the larger number of stars expected. It was the aim to collect in this note all arguments about GaiaNIR photometry which can be stated with words only, in correspondence with readers. The remaining work to be done for the definition of photometric equipment on the satellite requires further quantitative assessments and comparison of various options. Finally, 1) an advantage of filters is that the photometric observations can also be used for astrometry, 2) the XP spectra in Gaia will give very good astrophysical data for about 400 million single stars with G <~ 18.5 mag, but filters would have been better for all fainter and for all multiple stars, and 3) it is presently not clear which advantages for astrophysics low-dispersion spectra in the NIR might have over filters.