De-biasing interferometric visibilities in VLTI-AMBER data of low SNR observations
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.
Keywords
Cite
@article{arxiv.0711.4938,
title = {De-biasing interferometric visibilities in VLTI-AMBER data of low SNR observations},
author = {G. Li Causi and S. Antoniucci and E. Tatulli},
journal= {arXiv preprint arXiv:0711.4938},
year = {2009}
}
Comments
7 pages, 9 figures