Origin of the Baryonic j - M - fgas relation

Camilleri, Elise (2022) Origin of the Baryonic j - M - fgas relation. Bachelor's Thesis, Astronomy.

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Abstract

Galaxy scaling relations give important insight on the formation and evolution of galaxies by describing observable trends between their physical properties. One scaling relation of fundamental importance is that between a galaxy‘s baryonic mass (Mbar) and baryonic specific angular momentum (jbar) for disc galaxies, the scatter of which has been shown to correlate with variations in the gas fraction (fgas). This results in a tight linear relation between jbar,Mbar and fgas. By assuming an exponential accretion profile in space and time, and assuming the standard Kennicutt-Schmidt (K-S) star formation law and a non-evolving baryonic Tully-Fisher relation (BTFR), we explore for the first time quantitatively whether the tight correlation between the jbar, Mbar and fgas can be explained, in a scenario of gas accretion, as a result of the star formation efficiency being lower in the outer regions of the galactic discs. The simple model developed throughout this thesis is described by the accretion timescale (tacc) and radial scale-length of the accretion profile (racc). For a fixedMbar, these two parameters are varied and an analysis of the variation induced in both jbar and fgas is conducted. We show that, given the assumptions of our model, racc is a suitable candidate to explain the observed correlation between fgas and jbar at fixed Mbar.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Fraternali, F. and Pezzulli, G.
Degree programme:	Astronomy
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	20 Jul 2022 09:57
Last Modified:	20 Jul 2022 09:57
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/28062

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