Journal Article

Global disc models for galaxies NGC 1365, 6946, 7793 and UGC 6446

Joanna Jałocha, Łukasz Bratek, Marek Kutschera and Piotr Skindzier

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 4, pages 2805-2816
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI:
Global disc models for galaxies NGC 1365, 6946, 7793 and UGC 6446

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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 (H i+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 H i Nearby Galaxy Survey (THINGS) we also study galaxy NGC 4536 and compare the results with those we published elsewhere for the same galaxy.

Keywords: galaxies: kinematics and dynamics; galaxies: luminosity function, mass function; galaxies: spiral; galaxies: structure; dark matter

Journal Article.  9734 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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