H I observations of supermassive spiral galaxies

Details H I observations of supermassive spiral galaxies H I observations of supermassive spiral galaxies

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..451l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 15, 1985, p. 451-459.

Other

10

Extragalactic Radio Sources, Galactic Structure, Hydrogen Clouds, Interstellar Gas, Radial Velocity, Spiral Galaxies, Diameters, H Lines, Magnitude, Mass Distribution

Scientific paper

H I observations are presented for 13 supermassive spirals. The 20 percent profile width of UGC 9255 (NGC 5619) at 750 km/s is among the largest reliably recorded for any galaxy and is the largest for an Sb. Comparison with the other well-observed objects with wide profiles, NGC 4594 and NGC 5635, shows that it has a diameter 50 percent larger than the first and a more than 1.5 mag greater brightness than the second. In relation to a comparison group of supermassive galaxies, however, UGC 9255 is normal. An improved adjustment to the Zwicky apparent magnitude is derived for low-surface brightness galaxies.

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