101 spiral galaxies: neutral hydrogen distribution

Journal Article · Wed Oct 01 04:00:00 EDT 1980 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/112801· OSTI ID:6848296

Krumm, N; Salpeter, E E

This is a first report on a survey of the H I distributions in a large sample of spiral galaxies, using the 21-cm spectral-line system at Arecibo Observatory. One hundred and thirty galaxies have been observed, and 101 have been detected and roughly mapped in H I. The data have been used to determine systemic velocity, H I content, gravitational mass, and an approximate measure of the diameter of the H I distribution. There is a very high detection rate for galaxies brighter than 13.6 mag, and/or later than Hubble type Sab. Evidence is presented to show that the velocity widths of weak profiles measured at Green Bank are often overestimated because of noise. Our primary result is that there is a large scatter in H I diameters within each Hubble type. We find a weak suggestion that Sc galaxies have smaller H I diameters, on the average, than Sb galaxies. In addition, many Sb galaxies exhibit a highly asymmetric H I distribution. There appears to be no correlation between optical luminosity and H I extent.

• Research Organization: Astronomy Department, The University of Michigan, Ann Arbor, Michigan 48109
• OSTI ID: 6848296
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 85:10; 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
DATA
DISTRIBUTION FUNCTIONS
EXPERIMENTAL DATA
FUNCTIONS
GALAXIES
H1 REGIONS
INFORMATION
LUMINOSITY
MASS
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES