The dark side of NGC 3109

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115548· OSTI ID:6481833

Jobin, M; Carignan, C ^[1]

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1. Observatoire du Mont Megantic, Montreal (Canada)

Optical and radio observations of the Magellanic-type spiral galaxy NGC 3109 were carried out to obtain data on the kinematics and distribution of H I. I-band photometry, performed in order to determine the distribution of the old stellar disk population, more representative of the true mass distribution of the disk, is compared with the B-band photometry. H I spectral line imaging shows that the total neutral hydrogen content is 4.9 + or - 1.0 x 10 to the 8th solar masses; the systematic velocity is 406 + or - 2 km/s. The contribution from the dark component is found to dominate at nearly all radii, indicating a breakdown of the disk-halo conspiracy towards the low end of the luminosity function. 29 refs.

• OSTI ID: 6481833
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 100; 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
ASTRONOMY
CONFIGURATION
COSMIC RADIO SOURCES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
GALAXIES
H1 REGIONS
LUMINOSITY
MATHEMATICAL MODELS
MORPHOLOGY
MOTION
OPTICAL PROPERTIES
PARTICLE KINEMATICS
PHOTOMETRY
PHYSICAL PROPERTIES
RADIATIONS
RADIOASTRONOMY
RADIOWAVE RADIATION
ROTATION
SPATIAL DISTRIBUTION
SPIRAL CONFIGURATION
VISIBLE RADIATION