Neutral hydrogen observations of 14 nearly edge-on spiral galaxies

Journal Article · Wed Aug 01 04:00:00 EDT 1979 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/112521· OSTI ID:6130977

Krumm, N; Salpeter, E E

H I spectra were taken along the major axes of 14 large, relatively edge-on spiral galaxies with the 21 cm circular feed at Arecibo Observatory. A procedure is developed to subtract out contributions from the first sidelobe of the beam, at least approximately. From the corrected profiles isophotal hydrogen diameters and (for the seven more extended cases) rotation curves are derived. Velocity disturbances seem to be more common for galaxies with close companions than for isolated galaxies. As found by other authors, rotation curves tend to be flat at least to the Holmberg radius, suggesting the presence of dark material in the outer regions of spiral galaxies. Comparison with early-type disk galaxies shows that (a) H I diameters vary much less with Hubble type than do H I masses, (b) the surface density of gravitational mass tends to be higher in the earlier systems, and (c) the ratio of gravitational mass to luminosity varies little with Hubble type.

• Research Organization: Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz 95064
• OSTI ID: 6130977
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 84:8; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
DISTRIBUTION
EMISSION SPECTRA
GALAXIES
H1 REGIONS
INTERFEROMETRY
MASS
MOTION
ROTATION
SPATIAL DISTRIBUTION
SPECTRA
SPECTROSCOPY