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• 1611.05039v1

Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Ana Paulino-Afonso, David Sobral, Fernando Buitrago, José Afonso; The structural and size evolution of star-forming galaxies over the last 11 Gyr. Mon Not R Astron Soc 2017; 465 (3): 2717-2733. doi: 10.1093/mnras/stw2933 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2933

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## The structural and size evolution of star-forming galaxies over the last 11 Gyrs

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Journal publication date 03/2017 Monthly Notices of the Royal Astronomical Society 3 465 17 2717-2733 Published 14/11/16 English

### Abstract

We present new results on the evolution of rest-frame blue/UV sizes and Sersic indices of H$\alpha$-selected star-forming galaxies over the last 11 Gyrs. We investigate how the perceived evolution can be affected by a range of biases and systematics such as cosmological dimming and resolution effects. We use GALFIT and an artificial redshifting technique, which includes the luminosity evolution of H$\alpha$-selected galaxies, to quantify the change on the measured structural parameters with redshift. We find typical sizes of 2 to 3 kpc and Sersic indices of n~1.2, close to pure exponential disks all the way from z=2.23 to z=0.4. At z=0 we find typical sizes of 4-5 kpc. Our results show that, when using GALFIT, cosmological dimming has a negligible impact on the derived effective radius for galaxies with n

### Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Ana Paulino-Afonso, David Sobral, Fernando Buitrago, José Afonso; The structural and size evolution of star-forming galaxies over the last 11 Gyr. Mon Not R Astron Soc 2017; 465 (3): 2717-2733. doi: 10.1093/mnras/stw2933 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2933