| Title | Neutral hydrogen in isolated galaxies. II. The large angular diameter galaxies. |
| Authors | Hewitt, J. N.; Haynes, M. P.; Giovanelli, R. |
| Bibcode | 1983AJ.....88..272H Search ADS ↗ |
| Abstract | 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. |
| Objects | 93 Objects Search NED ↙ |
