Author ORCID Identifier
Document Type
Article
Publication Date
4-1-2008
Abstract
We present high-resolution optical velocity fields from DensePak integral field spectroscopy, along with derived rotation curves, for a sample of low surface brightness galaxies. In the limit of no baryons, we fit the NFW and pseudoisothermal halo models to the data and find the rotation curve shapes and halo central densities to be better described by the isothermal halo. For those galaxies with photometry, we present halo fits for three assumptions of the stellar mass-to-light ratio, Υ*. We find that the velocity contribution from the baryons is significant enough in the maximum disk case that maximum disk and the NFW halo are mutually exclusive. We find a substantial cusp mass excess at the centers of the galaxies, with at least 2 times more mass expected in the cuspy CDM halo than is allowed by the data. We also find that to reconcile the data with ACDM, ∼20 km s-1 noncircular motions are needed and/or the power spectrum has a lower amplitude on the scales that we probe. © 2008. The American Astronomical Society. All rights reserved. All rights reserved.
Keywords
dark matter, galaxies: fundamental parameters, galaxies: kinematics and dynamics
Language
English
Publication Title
Astrophysical Journal
Grant
702496
Rights
© The American Astronomical Society. All rights reserved. This content is free to access, download, and share. For all other uses, you must obtain permission to reuse content: https://journals.aas.org/article-charges-and-copyright/#AAS_material
Recommended Citation
Rachel Kuzio de Naray et al 2008. Mass Models for Low Surface Brightness Galaxies with High-Resolution Optical Velocity Fields. ApJ 676 920
Manuscript Version
Final Publisher Version