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Creating lenticular galaxies with mergers
- Source :
- Formation and Evolution of Galaxy Outskirts, Proceedings of the International Astronomical Union, IAU Symposium, 321, 114-116. Cambridge University Press
- Publication Year :
- 2016
- Publisher :
- Cambridge University Press, 2016.
-
Abstract
- Lenticular galaxies (S0s) represent the majority of early-type galaxies in the local Universe, but their formation channels are still poorly understood. While galaxy mergers are obvious pathways to suppress star formation and increase bulge sizes, the marked parallelism between spiral and lenticular galaxies (e.g. photometric bulge–disc coupling) seemed to rule out a potential merger origin. Here, we summarise our recent work in which we have shown, throughN-body numerical simulations, that disc-dominated lenticulars can emerge from major mergers of spiral galaxies, in good agreement with observational photometric scaling relations. Moreover, we show that mergers simultaneously increase the light concentration and reduce the angular momentum relative to their spiral progenitors. This explains the mismatch in angular momentum and concentration between spirals and lenticulars recently revealed by CALIFA observations, which is hard to reconcile with simple fading mechanisms (e.g. ram-pressure stripping).
- Subjects :
- Physics
Angular momentum
Spiral galaxy
Star formation
media_common.quotation_subject
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Galaxy merger
Galaxy
Universe
Space and Planetary Science
Bulge
galaxies: interactions
galaxies: structure
galaxies: elliptical and lenticular
galaxies: evolution
Lenticular galaxy
Astrophysics::Galaxy Astrophysics
galaxies: kinematics and dynamics
media_common
Subjects
Details
- Language :
- English
- ISSN :
- 23522186 and 17439213
- Volume :
- 321
- Database :
- OpenAIRE
- Journal :
- International Astronomical Union Symposium
- Accession number :
- edsair.doi.dedup.....205000eb6ce99bec6e8ed0cdc0fe73e6