Specific mass and radial growth rates of galaxy disks at z ~ 1

Luggenhorst, Thijs (2021) Specific mass and radial growth rates of galaxy disks at z ~ 1. Master's Thesis / Essay, Astronomy.

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Abstract

In this thesis we aim to quantify the growth of galaxies at z ~ 1 by applying the SFRD fitting method from Pezzulli et al. (2015). We adopt a sample of 12 star-forming galaxies (of which 10 are included in our final analysis) from the KMOS Redshift One Spectroscopic Survey (KROSS) (Stott et al., 2016) at z ~ 1, which was previously studied by Di Teodoro et al. (2016) and Marasco et al. (2019). Maps of Hα emission are extracted from KROSS data cubes for each galaxy, which are used as a tracer of the SFRD in our sample. We find that the specific mass growth rates of our sample are in agreement with findings for the star formation main sequence relation at z ~ 1 in the corresponding stellar mass range, found by Elbaz et al. (2007). 8/10 galaxies in our sample show positive radial growth rates, and only two show negative radial growth rates. We conclude that our results are consistent with the general picture of inside-out growth occurring at z ~ 1. With a median nu_M of 0.763 Gyr^(-1) and median nu_R of 0.109 Gyr^(-1) we find that galaxies at z ~ 1 grow ~7.5 times faster in mass and ~7 times faster in radius than their Local Universe counterparts. These results are in agreement with the main sequence of star formation. Furthermore, our results seem to be consistent with a model in which the mass-size relation is not strongly evolving with time.

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Fraternali, F. and Pezzulli, G.
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	03 Aug 2021 09:14
Last Modified:	03 Aug 2021 09:14
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/25445

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