Chemistry and Physics Faculty Articles

Document Type

Article

Publication Date

8-11-2015

Publication Title

Monthly Notices of the Royal Astronomical Society

Keywords

Galaxies: statistics, Galaxies: structure

ISSN

0035-8711

Volume

451

Issue/No.

3

First Page

2376

Last Page

2389

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.

Comments

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

DOI

10.1093/mnras/stv1085

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