Comparing galaxy morphology at high and low redshift
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Message boards : News : Comparing galaxy morphology at high and low redshift

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Profile David Thilker
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Message 4828 - Posted: 29 Feb 2016, 15:09:33 UTC

Hopefully everyone has been enjoying the latest set of galaxies. These objects are galaxy mergers identified by citizen scientist volunteers at galaxyzoo. We are going to be using them as part of an experiment contrasting different indicators of galaxy morphology at high and low redshift, so early and late epochs in the universe, respectively. A control sample of non-mergers is also being run at lower priority. In particular, working with my colleagues at JHU, we are measuring what is called non-parametric morphological indicators -- things like concentration, asymmetry, Gini coefficient, and many more -- both on the observed telescope images and on the physical parameter maps your CPUs are generating. This is normally done only on the observed images, and by working with derived physical quantities we hope to eliminate potential bias. Also, such measurements (for a complete set of non-parametric indicators) have never yet been compiled for the low redshift universe, though done frequently at high z. By working with the galaxies you are now processing we will establish a 'baseline' for galaxy morphology in the present day universe. Thanks!

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Message 4829 - Posted: 29 Feb 2016, 21:19:55 UTC - in response to Message 4828.

Thanks for the great update! Glad to know this project is continuing to do great science.


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Message 4830 - Posted: 1 Mar 2016, 14:09:53 UTC

Thanks for the information! Always interesting to hear where your data comes from, who you're working with and what you plan to do with the data, particularly if it's not been done before. You're welcome to my CPU cycles :-)

Message boards : News : Comparing galaxy morphology at high and low redshift

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