Digital Repository at the University of Maryland (DRUM)  >
College of Computer, Mathematical & Natural Sciences  >
Astronomy  >
Astronomy Research Works 

Please use this identifier to cite or link to this item: http://hdl.handle.net/1903/8715

Title: Simulating Observations of Dark Matter Dominated Galaxies: Towards the Optimal Halo Profile
Authors: de Blok, W.J.G.
Bosma, Albert Bosma
McGaugh, Stacy
Type: Article
Keywords: galaxies: kinematics and dynamics
galaxies: fundamental parameters
dark matter
Issue Date: 2007
Publisher: Blackwell
Citation: Simulating Observations of Dark Matter Dominated Galaxies: Towards the Optimal Halo Profile. de Blok, W.J.G., Bosma, A., & McGaugh, S.S. 2003, MNRAS, 340, 657-678.
Abstract: Low Surface Brightness (LSB) galaxies are dominated by dark matter, and their rotation curves thus reflect their dark matter distribution. Recent high-resolution rotation curves suggest that their dark matter mass-density distributions are dominated by a constant-density core. This seems inconsistent with the predictions of Cold Dark Matter (CDM) models which produce halos with compact density cusps and steep mass-density profiles. However, the observationally determined mass profiles may be affected by non-circular motions, asymmetries and offsets between optical and dynamical centres, all of which tend to lower the observed slopes. Here we determine the impact of each of these effects on a variety of halo models, and compare the results with observed mass-density profiles. Our simulations suggest that no single systematic effect can reconcile the data with the cuspy CDM halos. The data are best described by a model with a soft core with an inner power-law mass-density slope = −0.2±0.2. However, no single universal halo profile provides a completely adequate description of the data.
Required Publisher Statement: The definitive version is available at www.blackwell-synergy.com.
URI: http://hdl.handle.net/1903/8715
Appears in Collections:Astronomy Research Works

Files in This Item:

File Description SizeFormatNo. of Downloads
0212102v2.pdf1.27 MBAdobe PDF283View/Open

All items in DRUM are protected by copyright, with all rights reserved.

 

DRUM is brought to you by the University of Maryland Libraries
University of Maryland, College Park, MD 20742-7011 (301)314-1328.
Please send us your comments