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

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

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dc.contributor.author Martí Vidal, Iván
dc.contributor.author Marcaide Osoro, Juan María
dc.date.accessioned 2010-08-10T10:54:20Z
dc.date.available 2010-08-10T10:54:20Z
dc.date.issued 2008
dc.identifier.citation Martí-Vidal, I. and Marcaide, J. M. (2008): Spurious source generation in mapping from noisy phase-self-calibrated data, Astronomy and Astrophysics, núm. 480, vo. 1, pp. 289-295 en
dc.identifier.uri http://hdl.handle.net/10550/16811
dc.description.abstract 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. en
dc.language.iso en en
dc.subject Techniques : interferometric; Methods : data analysis; Techniques : image processing en
dc.title Spurious source generation in mapping from noisy phase-self-calibrated data en
dc.type journal article es_ES
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Otras especialidades astronómicas en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA en
dc.identifier.doi 10.1051/0004-6361:20078690 en
dc.identifier.idgrec 049801 en
dc.type.hasVersion VoR es_ES
dc.identifier.url http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361:20078690&Itemid=129 en

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