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Proceedings Paper

Variation of the near-IR sky continuum background from long-slit spectroscopy
Author(s): Y. B. Yang; M. Puech; H. Flores; F. Hammer; M. Rodrigues; K. Disseau
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Paper Abstract

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.

Paper Details

Date Published: 24 September 2012
PDF: 6 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84467Q (24 September 2012); doi: 10.1117/12.925945
Show Author Affiliations
Y. B. Yang, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
National Astronomical Observatories (China)
M. Puech, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
H. Flores, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
F. Hammer, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)
M. Rodrigues, European Southern Observatory (Chile)
GEPI, Observatoire de Paris, CNRS (France)
CENTRA, Instituto Superior Tecnico, Observatorio do Valongo (Brazil)
K. Disseau, GEPI, Observatoire de Paris, CNRS, Univ. Paris Diderot (France)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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