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
GHASP: An Hα kinematic survey of spiral and irregular galaxies - V. Dark matter distribution in 36 nearby spiral galaxies
Monthly Notices of the Royal Astronomical Society, Volume 383, No. 1, Year 2008
Notification
URL copied to clipboard!
Description
The results obtained from a study of the mass distribution of 36 spiral galaxies are presented. The galaxies were observed using Fabry-Perot interferometry as part of the GHASP survey. The main aim of obtaining high-resolution Hα 2D velocity fields is to define more accurately the rising part of the rotation curves which should allow to better constrain the parameters of the mass distribution. The Hα velocities were combined with low resolution H i data from the literature, when available. Combining the kinematical data with photometric data, mass models were derived from these rotation curves using two different functional forms for the halo: an isothermal sphere (ISO) and a Navarro-Frenk-White (NFW) profile. For the galaxies already modelled by other authors, the results tend to agree. Our results point at the existence of a constant density core in the centre of the dark matter haloes rather than a cuspy core, whatever the type of the galaxy from Sab to Im. This extends to all types the result already obtained by other authors studying dwarf and low surface brightness galaxies but would necessitate a larger sample of galaxies to conclude more strongly. Whatever model is used (ISO or NFW), small core radius haloes have higher central densities, again for all morphological types. We confirm different halo scaling laws, such as the correlations between the core radius and the central density of the halo with the absolute magnitude of a galaxy: low-luminosity galaxies have small core radius and high central density. We find that the product of the central density with the core radius of the dark matter halo is nearly constant, whatever the model and whatever the absolute magnitude of the galaxy. This suggests that the halo surface density is independent from the galaxy type. © 2007 The Authors.
Authors & Co-Authors
Marcelin, Michel
France, Marseille
Laboratoire D'astrophysique de Marseille
Amram, Phillippe
France, Marseille
Laboratoire D'astrophysique de Marseille
Carignan, Claude
Canada, Montreal
University of Montreal
Épinat, Benoît
France, Marseille
Laboratoire D'astrophysique de Marseille
Hernandez, Olivier
Canada, Montreal
University of Montreal
Statistics
Citations: 170
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1111/j.1365-2966.2007.12545.x
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative