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What Can We Learn from the Local Group About the Role of Interactions in Galaxy Formation

Published online by Cambridge University Press:  25 May 2016

K.C. Freeman
K.C. Freeman*
Affiliation:
Mount Stromlo and Siding Spring Observatories, The Australian National University, Canberra, AUSTRALIA

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This talk is mainly about the halos and bulges of Local Group galaxies, in particular those of the Milky Way and M31, and what they can tell us about the role of interactions in galaxy formation. Bulges are potentially of particular interest for galaxy formation because they are widely suspected to be the seeds for galaxy formation. Sites of active star formation at high redshift are often regarded as spheroids in the process of formation. In this talk, I will say little about disks because their formation is conceptually understood, although many details remain uncertain. To form such flat systems, a fairly undisturbed dissipative process is needed. This process occurred fairly early: the disks appear to be in place by a redshift z = 1 (Ellis 1997), with a distribution of scalelengths that is similar to the distribution at z = 0.

Type
Local Group
Information
Symposium - International Astronomical Union , Volume 186: Galaxy Interactions at High and Low Redshift , 1999 , pp. 23 - 29
Copyright
Copyright © Kluwer 1999 

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