Global disk model for galaxies NGC 1365, NGC 6946, NGC 7793, UGC 6446

Details Global disk model for galaxies NGC 1365, NGC 6946, NGC 7793, UGC 6446 Global disk model for galaxies NGC 1365, NGC 6946, NGC 7793, UGC 6446

2009-06-24

arxiv.org/abs/0906.4448v3

Mon.Not.Roy.Astron.Soc.406:2805-2816,2010

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

12 pages, 11 figures

Scientific paper

10.1111/j.1365-2966.2010.16887.x

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.

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