Martindale, Hazel, Thomas, Peter A, Henriques, Bruno M and Loveday, Jon (2017) Towards a consistent model for both the Hi and stellar mass functions of galaxies. Monthly Notices Of The Royal Astronomical Society, 472 (2). pp. 1981-1990. ISSN 0035-8711

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Abstract

Using the L-Galaxies semi-analytic model we simultaneously fit the H I mass function, stellar mass function and the fraction of red galaxies. We find good fits to all three observations at z = 0 and to the stellar mass function and red fraction at z = 2. Using Markov Chain Monte Carlo (MCMC) techniques we adjust the L-Galaxies parameters to best fit the constraining data. In order to fit the H I mass function we must greatly reduce the gas surface density threshold for star formation, thus lowering the number of low H I mass galaxies. A simultaneous reduction in the star formation efficiency prevents the overproduction of stellar content. A simplified model in which the surface density threshold is eliminated altogether also provides a good fit to the data. Unfortunately, these changes weaken the fit to the Kennicutt–Schmidt relation and raise the star formation rate density at recent times, suggesting that a change to the model is required to prevent accumulation of gas on to dwarf galaxies in the local Universe.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Depositing User:	Billy Wichaidit
Date Deposited:	07 Nov 2017 12:38
Last Modified:	07 Nov 2017 12:38
URI:	http://srodev.sussex.ac.uk/id/eprint/71041

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