Frequency of occurrence of thin edge-on spiral galaxies

Details Frequency of occurrence of thin edge-on spiral galaxies Frequency of occurrence of thin edge-on spiral galaxies

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..318k&link_type=abstract

Astronomy Letters, Volume 25, Issue 5, May 1999, pp.318-321

Astronomy and Astrophysics

Astronomy

6

Scientific paper

The relative number of flat galaxies with apparent axial ratios a/b > or = 7 is estimated by using the FGC catalog. The fractions of such galaxies in angular-diameter and apparent-magnitude-limited samples have been found to differ markedly (1/17 and 1/61, respectively). In order to explain this difference, we must assume that for edge-on Sc and Sd galaxies, the angular diameter is 35% larger and the luminosity is 0.77 mag lower than their respective values for face-on galaxies. Flat galaxies are encountered a factor of 2 more frequently among isolated galaxies and IRAS sources. The fraction of FGC galaxies among the active Markarian galaxies and low surface brightness dwarf systems (DDO) is an order of magnitude lower than the expected value, which is probably attributable to peculiarities of the evolution of thin spiral disks.

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