Computer approximation of the spectrograms of radio sources

Details Computer approximation of the spectrograms of radio sources Computer approximation of the spectrograms of radio sources

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982azh....59.1020s&link_type=abstract

(Astronomicheskii Zhurnal, vol. 59, Sept.-Oct. 1982, p. 1020-1029) Soviet Astronomy (ISSN 0038-5301), vol. 26, Sept.-Oct. 1982,

Astronomy and Astrophysics

Astronomy

10

Computer Programs, Radio Sources (Astronomy), Radio Spectra, Spectrograms, Algorithms, H Alpha Line, Orion Nebula, Root-Mean-Square Errors, Spectral Line Width

Scientific paper

The paper describes a procedure for the rms approximation of the spectrograms of radio sources. The max-neighborhood algorithm, having a high convergence rate, is employed to minimize the sum of squares of deviations; and an analytical approximation of the Voigt function is employed as the universe profile to describe spectral lines. Systematic errors in determining line widths and amplitudes do not exceed tenths of a percent for any form of line profile from Gaussian to Lorentzian, while for lines with extended wings the uncertainty in the zero-line shape introduces errors an order of magnitude smaller than those in the case of the Gaussian function usually used. This approach was implemented on the BIFIT program for approximating spectrograms of radio sources; the program was realized in FORTRAN on an M-6000 computer which is part of the RT-22 radio telescope system. By way of illustration, the use of the present approach to isolate the Stark wings in the profile of the H 110-alpha recombination line from the Orion Nebula, to separate overlapping spectral lines, and to analyze the effect of stray noise interference in the multiple-mirror antenna of the radio telescope is shown.

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