Global disk model for galaxies NGC 1365, NGC 6946, NGC 7793, UGC 6446
Abstract
Spiral galaxies are studied using a simple global disc model as a means for approximate determination of mass profiles. Based on rotation curves and the amount of gas (HI+He), we find global surface mass densities consistent with measurements and compare them with B-band surface brightness profiles. As a result we obtain mass-to-light ratio profiles. We give some arguments for why our approach is reliable and sometimes better than those assuming ad hoc the presence of a massive non-baryonic dark matter halo. Using this model, we study galaxies NGC 7793, 1365, 6946 and UGC 6446. Based on a rotation curve from The HI Nearby Galaxy Survey (THINGS) we also study galaxy NGC 4536 and compare the results with those we published elsewhere for the same galaxy.
Keywords
Cite
@article{arxiv.0906.4448,
title = {Global disk model for galaxies NGC 1365, NGC 6946, NGC 7793, UGC 6446},
author = {Joanna Jałocha and Łukasz Bratek and Marek Kutschera and Piotr Skindzier},
journal= {arXiv preprint arXiv:0906.4448},
year = {2011}
}
Comments
12 pages, 11 figures