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Article
Does the Stellar Disc Flattening Depend on the Galaxy Type
Monthly Notices of the Royal Astronomical Society
  • A. V. Mosenkov, Universiteit Gent; Central Astronomical Observatory of RAS; St Petersburg State University
  • N. Ya. Sotnikova, St Petersburg State University; Isaac Newton Institute of Chile
  • V. P. Reshetnikov, St Petersburg State University; Isaac Newton Institute of Chile
  • D. V. Bizyaev, Apache Point Observatory and New Mexico State University; Moscow State University
  • Stefan Kautsch, Nova Southeastern University
Publication Date
8-11-2015
Keywords
  • Galaxies: statistics,
  • Galaxies: structure
Peer Reviewed
1
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
Citation Information
A. V. Mosenkov, N. Ya. Sotnikova, V. P. Reshetnikov, D. V. Bizyaev, et al.. "Does the Stellar Disc Flattening Depend on the Galaxy Type" Monthly Notices of the Royal Astronomical Society Vol. 451 Iss. 3 (2015) p. 2376 - 2389 ISSN: 0035-8711
Available at: http://works.bepress.com/stefan-kautsch/13/