Comparisons between 21 CM data from Effelsberg and Greenbank

Details Comparisons between 21 CM data from Effelsberg and Greenbank Comparisons between 21 CM data from Effelsberg and Greenbank

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...84...47t&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 84, no. 1, July 1990, p. 47-58.

Astronomy and Astrophysics

Astronomy

19

Galaxies, Radio Astronomy, Red Shift, Astronomical Observatories, Radio Telescopes, Spectral Line Width

Scientific paper

Comparison of 21-cm data from the Effelsberg 100-m and NRAO Greenbank 91-m telescopes are used to find the limiting precision for redshift measurement. At SNR levels of 10 or above, the random uncertainty actually achieved in a single redshift measurement is demonstrated to be 0.85 km/s at a bandwidth of 6.25 MHz. Uncertainty in other bands scales as the square root of the bandwidth relative to 6.25 MHz. Random error is also found to be independent of which telescope or software is used as long as the SNR is large. At low SNR the choice of software affects precision. Substantial systematic errors are shown to be present in some existing systems or software, due to errors in specifying the location of the center frequency. Such errors can easily be eliminated with standardized intercomparisons.

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