Chemistry and Physics Faculty Articles

Document Type

Article

Publication Title

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publication Date

8-11-2015

Keywords

Galaxies: statistics, Galaxies: structure

Abstract

We analyse the dependence of the stellar disc flatness on the galaxy morphological type using 2D decomposition of galaxies from the reliable subsample of the Edge-on Galaxies in SDSS catalogue. Combining these data with the retrieved models of the edge-on galaxies from the Two Micron All Sky Survey and the Spitzer Survey of Stellar Structure in Galaxies catalogue, we make the following conclusions.

  1. The disc relative thickness z0/h in the near- and mid-infrared passbands correlates weakly with morphological type and does not correlate with the bulge-to-total luminosity ratio B/T in all studied bands.

  2. Applying a 1D photometric profile analysis overestimates the disc thickness in galaxies with large bulges making an illusion of the relationship between the disc flattening and the ratio B/T.

  3. In our sample, the early-type disc galaxies (S0/a) have both flat and ‘puffed’ discs. The early spirals and intermediate-type galaxies have a large scatter of the disc flatness, which can be caused by the presence of a bar: barred galaxies have thicker stellar discs, on average. On the other hand, the late-type spirals are mostly thin galaxies, whereas irregular galaxies have puffed stellar discs.

DOI

10.1093/mnras/stv1085

Volume

451

Issue

3

First Page

2376

Last Page

2389

Comments

© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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