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24 September 2012 Variation of the near-IR sky continuum background from long-slit spectroscopy
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The amplitudes and scales of spatial variations of the sky continuum background can be a potential limit of the telescope performance, because the study of the extremely faint objects requires the subtraction accuracy below 1%. Thus, studying its statistical properties is essential for the design of next generation instruments, especially the fiber-fed instruments, as well as their observation strategies. Using ESO archive data of VLT/FORS2 long-slit observations, we analyzed the auto-correlation function of the sky continuum. As preliminary results, we find that the sky continuum background has multi-scale spatial variations at scales from 2" to 150" with total amplitude of ~0.5%, for an given exposure time of 900s. This can be considered as the upper limit of sky continuum background variation over a field-of-view of few arcmins. The origin of these variations need further studies.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. B. Yang, M. Puech, H. Flores, F. Hammer, M. Rodrigues, and K. Disseau "Variation of the near-IR sky continuum background from long-slit spectroscopy", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84467Q (24 September 2012); doi: 10.1117/12.925945;

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