The neutral hydrogen content of early type disk galaxies

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Astronomical Journal; (United States)

DOI:https://doi.org/10.1086/115894· OSTI ID:5257547

Eder, J; Giovanelli, R; Haynes, M P ^[1]

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1. Yale University, New Haven, CT (United States) Carnegie Institution of Washington, Washington, DC (United States) Arecibo Observatory, PR (United States) Cornell University, Ithaca, NY (United States)

This paper presents the results of a sensitive 21-cm survey of massive early type galaxies made with the Arecibo radio telescope. Of the 81 galaxies observed, the detections comprise 48 percent of the S0s, 73 percent of the S0a's, and 96 percent of the Sa's. The values of the hybrid, distance-independent H I surface densities of the S0 galaxies in the sample ranged continuously from amounts comparable to the most gas-rich Sa galaxies to low estimated upper limts of the H I content. CCD images of most of the gas-rich S0s revealed either faint spiral features or patchy structure in the disks. While no firm correlation between H I content and environmental density is apparent for the galaxies in the sample, two-sample statistics suggest a difference between the highest and the lowest density bins. Early-type disk galaxies within low density environments tend to have higher gas surface densities than those within high-density environments. 62 refs.

• OSTI ID: 5257547
• Journal Information: Astronomical Journal; (United States), Journal Name: Astronomical Journal; (United States) Vol. 102; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTENNAS
COSMIC GASES
COSMIC RADIO SOURCES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FAR INFRARED RADIATION
FLUIDS
GALAXIES
GASES
H1 REGIONS
IMAGES
INFRARED RADIATION
LIMITING VALUES
LUMINOSITY
MASS
MORPHOLOGY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIO EQUIPMENT
RADIO TELESCOPES
SPECTROSCOPY
STAR EVOLUTION
SURVEYS
TELESCOPES