Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
High-resolution rotation curves and galaxy mass models from things
Astronomical Journal, Volume 136, No. 6, Year 2008
Notification
URL copied to clipboard!
Description
We present rotation curves of 19 galaxies from The H I Nearby Galaxy Survey (THINGS). The high spatial and velocity resolution of THINGS make these the highest quality H I rotation curves available to date for a large sample of nearby galaxies, spanning a wide range of H I masses and luminosities. The high quality of the data allows us to derive the geometric and dynamical parameters using H I data alone. We do not find any declining rotation curves unambiguously associated with a cut-off in the mass distribution out to the last measured point. The rotation curves are combined with 3.6 μm data from the Spitzer Infrared Nearby Galaxies Survey to construct mass models. Our best-fit dynamical disk masses, derived from the rotation curves, are in good agreement with photometric disk masses derived from the 3.6 μm images in combination with stellar population synthesis arguments and two different assumptions for the stellar initial mass function (IMF). We test the cold dark matter (CDM) motivated cusp model, and the observationally motivated central density core model and find that (independent of IMF) for massive, disk-dominated galaxies, all halo models fit apparently equally well; for low-mass galaxies, however, a core-dominated halo is clearly preferred over a cusp-like halo. The empirically derived densities of the dark matter halos of the late-type galaxies in our sample are half of what is predicted by CDM simulations, again independent of the assumed IMF. © 2008. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
de Blök, Willem J.G.
South Africa, Cape Town
University of Cape Town
Walter, Fabian W.
Germany, Heidelberg
Max Planck Institute for Astronomy
Brinks, Elias
United Kingdom, Hatfield
University of Hertfordshire
Trachternach, Clemens
Germany, Bochum
Ruhr-universitat Bochum
Oh, Se-heon
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Kennicutt, Robert C.
United Kingdom, Cambridge
Institute of Astronomy
Statistics
Citations: 694
Authors: 6
Affiliations: 6
Identifiers
Doi:
10.1088/0004-6256/136/6/2648
ISSN:
00046256
Study Design
Cross Sectional Study
Study Approach
Quantitative