What is a galaxy?

1. What is a galaxy survey

 
Welcome to the survey for your opinion on the definition of a galaxy. We assume that a galaxy needs to be a gravitationally bound stellar system. But such a definition would include globular star clusters. Thus additional criteria are needed. Please cast your vote below.
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1. Have you read the paper by Forbes and Kroupa accepted for publication in Publications of the Astronomical Society of Australia entitled "What is a galaxy? Cast your vote here..." (its available at http://arxiv.org/abs/1101.3309)
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2. Which of the following are the minimum criteria to define a galaxy?
[You may pick one or multiple choices.]
3. Do you have different criteria for the definition of a galaxy? If so, brief ideas can be written below. If you would like to take part in ongoing discussion of this topic then open this link in a browser window:
http://www.scilogs.eu/en/blog/the-dark-matter-crisis/2011-01-19/question-b-what-is-a-galaxy
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