Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..272h&link_type=abstract
Astronomical Journal, vol. 88, Mar. 1983, p. 272-295.
Astronomy and Astrophysics
Astronomy
85
Galactic Evolution, Hydrogen, Interstellar Gas, Neutral Gases, Astronomical Catalogs, Centimeter Waves, Mapping, Radii, Radio Sources (Astronomy)
Scientific paper
Fifty-two of the large-angular-diameter (greater than or equal to 2.5 arcmin) galaxies included in the 21-cm survey of isolated galaxies being undertaken at Arecibo are mapped along their optical major axes using the 305-m telescope and the low sidelobe flat feed system. The observed fluxes are then compared with a numerical convolution of an assumed H I distribution and the beam pattern to produce an estimate of the characteristic size. The derived H I scale length is that radius interior to which 70% of the model's H I mass is contained. With still an appreciable scatter, the H I diameter is on the average about 1.2 times the UGC blue diameter (1), and exhibits no dependence on morphological type for types later than Sa. Applying the observed relationship between H I size and optical diameter and an assumed double Gaussian (centrally depressed) H I surface density distribution gives proper corrections for source-to-beam size.
Giovanelli Riccardo
Haynes Martha P.
Hewitt Jacqueline N.
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