The intrinsic ellipticity of dwarf spheroidal galaxies: constraints from the Andromeda system
| Autor: | Nicolas F. Martin, Benoit Famaey, J.-B. Salomon, Rodrigo A. Ibata |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Physics
education.field_of_study Andromeda Galaxy Dwarf galaxy problem Population FOS: Physical sciences Local Group Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Dwarf spheroidal galaxy Andromeda Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics education Astrophysics::Galaxy Astrophysics Dwarf galaxy |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 450:1409-1419 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stv741 |
| Popis: | We present a study of the intrinsic deprojected ellipticity distribution of the satellite dwarf galaxies of the Andromeda galaxy, assuming that their visible components have a prolate shape, which is a natural outcome of simulations. Different possibilities for the orientation of the major axis of the prolate dwarf galaxies are tested, pointing either as close as possible to the radial direction towards the centre of Andromeda, or tangential to the radial direction, or with a random angle in the plane that contains the major axis and the observer. We find that the mean intrinsic axis ratio is ~ 1/2, with small differences depending on the assumed orientation of the population. Our deprojections also suggest that a significant fraction of the satellites, ~ 10%, are tidally disrupted remnants. We find that there is no evidence of any obvious difference in the morphology and major axis orientation between satellites that belong to the vast thin plane of co-rotating galaxies around Andromeda and those that do not belong to this structure. Comment: 12 pages, 17 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|