Journal Article

Disc heating agents across the Hubble sequence*

J. Gerssen and K. Shapiro Griffin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 3, pages 2726-2735
Published in print July 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI:
Disc heating agents across the Hubble sequence*

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We measure the shape of the velocity ellipsoid in two late-type spiral galaxies (Hubble types Sc and Scd) and combine these results with our previous analyses of six early-type spirals (Sa to Sbc) to probe the relation between galaxy morphology and the ratio of the vertical and radial dispersions. We confirm at much higher significance (99.9 per cent) our prior detection of a tight correlation between these quantities. We explore the trends of the magnitude and shape of the velocity ellipsoid axes with galaxy properties (colour, gas surface mass density and spiral arm structure). The observed relationships allow for an observational identification of the radial and vertical disc heating agents in external disc galaxies.

Keywords: galaxies: fundamental parameters; galaxies: individual: NGC 2280; galaxies: individual: NGC 3810; galaxies: kinematics and dynamics; galaxies: structure

Journal Article.  7410 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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