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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
H I studies of the sculptor group galaxies. VIII. The background galaxies: NGC 24 and NGC 45
Astronomical Journal, Volume 132, No. 6, Year 2006
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Description
In order to complete our H I survey of galaxies in the Sculptor group area, Very Large Array observations of NGC 24 and NGC 45 are presented. These two galaxies of similar magnitude, MB ∼17.4, lie in the background of the Sculptor group and are low surface brightness galaxies, especially NGC 45. The H I distribution and kinematics are regular for NGC 24, while NGC 45 exhibits a kinematical twist of its major axis. A tilted-ring model shows that the position angle of the major axis changes by ∼25°. A best-fit model of their mass distributions gives mass-to-light ratios for the stellar disk of 2.5 and 5.2 for NGC 24 and NGC 45, respectively. These values are higher than those expected from stellar population synthesis models. Despite the large dark matter contribution, the galaxy mass is still dominated by the stellar component in their very inner regions. These high mass-to-light ratios are typical of what is seen in low surface brightness galaxies and may indicate that, in those galaxies, disks are far from the maximum disk case. The halo parameters derived from the best-fit models are thus lower limits. © 2006. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Chemin, Laurent
Canada, Montreal
University of Montreal
France, Paris
Université Paris Cité
Carignan, Claude
Canada, Montreal
University of Montreal
Freeman, Kenneth C.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Statistics
Citations: 122
Authors: 3
Affiliations: 3
Identifiers
Doi:
10.1086/508859
ISSN:
00046256
Study Design
Cross Sectional Study
Study Approach
Quantitative