What is a galaxy?
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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.

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)

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) Yes

2. Which of the following are the minimum criteria to define a galaxy?
[You may pick one or multiple choices.]

Which of the following are the minimum criteria to define a galaxy? [You may pick one or multiple choices.] A relaxation time that is greater than the age of the Universe

A half-light radius greater than 100 pc

The presence of complex stellar populations

The presence of dark matter

Hosts a satellite stellar system

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

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

What is a galaxy?Exit this survey

1. What is a galaxy survey

What is a galaxy?
Exit this survey