Spurious source generation in mapping from noisy phase-self-calibrated data

Details Spurious source generation in mapping from noisy phase-self-calibrated data Spurious source generation in mapping from noisy phase-self-calibrated data

2008-01-08

arxiv.org/abs/0801.1272v1

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures. Accepted in A&A on 12 December 2007

Scientific paper

10.1051/0004-6361:20078690

Phase self-calibration (or selfcal) is an algorithm often used in the calibration of interferometric observations in astronomy. Although a powerful tool, this algorithm presents strong limitations when applied to data with a low signal-to-noise ratio. We analyze the artifacts that the phase selfcal algorithm produces when applied to extremely noisy data. We show how the phase selfcal may generate a spurious source in the sky from a distribution of completely random visibilities. This spurious source is indistinguishable from a real one. We numerically and analytically compute the relationship between the maximum spurious flux density generated by selfcal from noise and the particulars of the interferometric observations. Finally, we present two simple tests that can be applied to interferometric data for checking whether a source detection is real or whether the source is an artifact of the phase self-calibration algorithm.

Affiliated with

Also associated with

No associations

Rating

Spurious source generation in mapping from noisy phase-self-calibrated data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spurious source generation in mapping from noisy phase-self-calibrated data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spurious source generation in mapping from noisy phase-self-calibrated data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-421599