Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..962l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, July 1983, p. 962-971.
Astronomy and Astrophysics
Astronomy
33
Astrometry, Hydrogen Clouds, Spiral Galaxies, Velocity Measurement, Astronomical Models, Gas Density, Monte Carlo Method, Signal To Noise Ratios, Spectral Energy Distribution, Statistical Analysis
Scientific paper
A procedure for estimating the internal reliability of the systemic velocity and the velocity width of galaxies inferred from observations of H I profiles is presented. A Monte Carlo approach is used to analyze the mean widths and variances of a single observation, regarding the signal as a peak in the profile, with noise being the rms variation in the flux. Attention is given to the S/N ratio, with gaussian noise added at an equal magnitude to the rms noise in the original profile. A Monte Carlo simulation then represents the effects of noise on the velocity measurements. A bias towards overestimation of the widths of narrow profiles was found, together with the correlation between predicted errors and S/N ratios. It is recommended that observers set S/N criteria for all observations, and that rms noise present in H I observations be published.
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