An application of the bispectrum to intensity measurements of point sources using a millimetre array.

Details An application of the bispectrum to intensity measurements of point sources using a millimetre array. An application of the bispectrum to intensity measurements of point sources using a millimetre array.

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jelco..81...51k&link_type=abstract

Electron. Commun. Jpn. 1, Commun. (USA), Vol. 81, No. 5, p. 51 - 61

Astronomy and Astrophysics

Astronomy

Radio Interferometers: Mm Radiation, Radio Interferometers: Methods Of Reduction

Scientific paper

In astronomical observations with millimetre-wave radio interferometers, signal-to-noise ratios cannot be increased by data integration due to disturbances in the phase of measured data by atmospheric fluctuations. To alleviate this problem, an observation quantity called the bispectrum has drawn attention recently. Since, in principle, the bispectrum is not affected by atmospheric phase fluctuations, it is possible to enhance the signal-to-noise ratio by integration over a long period of time. It is proposed to use the bispectrum for intensity measurement of astronomical bodies with a millimetre-wave interferometer. For intensity measurements using a conventional interferometer, the phase error of the data is first corrected and then the entire data set is averaged to estimate the intensity. In the new method, the entire bispectrum is averaged and then the astronomical intensity is estimated from the third root of its real part. In order to discuss the accuracy of the new method, the statistical nature of the bispectrum is elucidated analytically. By comparing the conventional method and the method using the bispectrum in computer simulations, it is shown that the new method can realize higher accuracy. This conclusion is confirmed by observations.

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