Monthly Notices of the Royal Astronomical Society
Galaxies: statistics, Galaxies: structure
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.
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.
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.
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.
Mosenkov, A. V., Sotnikova, N. Y., Reshetnikov, V. P., Bizyaev, D. V., & Kautsch, S. (2015). Does the Stellar Disc Flattening Depend on the Galaxy Type. Monthly Notices of the Royal Astronomical Society, 451, (3), 2376 - 2389. https://doi.org/10.1093/mnras/stv1085. Retrieved from https://nsuworks.nova.edu/cnso_chemphys_facarticles/106