Star formation in high redshift galaxies including Supernova feedback: effect on stellar mass and luminosity functions

Abstract

We present a semi-analytical model of high redshift galaxy formation. In our model the star formation inside a galaxy is regulated by the feedback from supernova (SNe) driven outflows. We derive a closed analytical form for star formation rate in a single galaxy taking account of the SNe feedback in a self-consistent manner. We show that our model can explain the observed correlation between the stellar mass and the circular velocity of galaxies from dwarf galaxies to massive galaxies of $10^{12}{M}_{\odot }$. For small mass dwarf galaxies additional feedback other than supernova feedback is needed to explain the spread in the observational data. Our models reproduce the observed 3-D fundamental correlation between the stellar mass, gas phase metallicity and star formation rate in galaxies establishing that the SNe feedback plays a major role in building this relation. Further, the observed UV luminosity functions of Lyman-Break galaxies (LBGs) are well explained by our feedback induced star formation model for a vast redshift range of $1.5\le z\le 8$. In particular, the flattening of the luminosity functions at the low luminosity end naturally arises due to our explicit SNe feedback treatment.

21 pages, 7 figures, Accepted for publication in New Astronomy

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• Dark-ages reionization and galaxy formation simulation XI: Clustering and halo masses of high redshift galaxies
• Probing the fluctuating Ultra-violet background using the Hubble Frontier Fields
• Impact of cosmic rays on the global 21-cm signal during cosmic dawn
• Episodic Model For Star Formation History and Chemical Abundances in Giant and Dwarf Galaxies
• A physical model for the redshift evolution of high-z Lyman-Break Galaxies
• On the star formation efficiency in high redshift Lyman-α emitters
• Exploring the Voids: Luminosity Functions and Magnetic Field