Comparative properties of Virgo Cluster dwarf irregulars and spirals

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165881· OSTI ID:5438424

Hoffman, G L; Helou, G; Salpeter, E E

The optical and neutral hydrogen data for all spiral and late-type dwarf irregular galaxies in the Virgo Cluster catalog are analyzed. In particular, the continuity of optical properties, hydrogen masses, and dynamical properties are examined as functions of morphology and luminosity from the largest spirals through the faintest dwarfs (omitting blue compact dwarf galaxies); the effects of environment on H I content; mass segregation; and the Tully-Fisher relations. The spiral plus dwarf sample forms a continuous but nonhomologous sequence. Indicative dynamical mass-to-light ratios are relatively constant throughout; hydrogen mass-to-light ratios show only a slight increase with decreasing luminosity. The Tully-Fisher relations extend with continuous slope from spirals through dwarfs. The dwarfs show some evidence of ram-pressure stripping by the intracluster medium, but as a group do not seem to be stripped more heavily than spirals. There is no evidence of mass segregation even for the very low mass dwarfs versus giant spirals. 88 references.

• Research Organization: Lafayette College, Easton, PA (USA); California Institute of Technology, Pasadena (USA); Cornell Univ., Ithaca, NY (USA)
• OSTI ID: 5438424
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 324; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
H1 REGIONS
LUMINOSITY
MASS
MORPHOLOGY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPIRAL CONFIGURATION
VISIBLE RADIATION