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arXiv:0711.4938 (astro-ph)
[Submitted on 30 Nov 2007]

Title:De-biasing interferometric visibilities in VLTI-AMBER data of low SNR observations

Authors:G. Li Causi, S. Antoniucci, E. Tatulli
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Abstract: AIMS: We have found that the interferometric visibilities of VLTI-AMBER observations, extracted via the standard reduction package, are significantly biased when faint targets are concerned. The visibility biases derive from a time variable fringing effect (correlated noise) appearing on the detector. METHODS: We have developed a method to correct this bias that consists in a subtraction of the extra power due to such correlated noise, so that the real power spectrum at the spatial frequencies of the fringing artifact can be restored. RESULTS: This pre-processing procedure is implemented in a software, called AMDC and available to the community, to be run before the standard reduction package. Results obtained on simulated and real observations are presented and discussed.
Comments: 7 pages, 9 figures
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0711.4938 [astro-ph]
  (or arXiv:0711.4938v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0711.4938
Related DOI: https://doi.org/10.1051/0004-6361%3A20077629

Submission history

From: Gianluca Li Causi [view email]
[v1] Fri, 30 Nov 2007 14:07:22 UTC (2,235 KB)
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