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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, p. stx005

DOI: 10.1093/mnras/stx005

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Quenching vs. Quiescence: forming realistic massive ellipticals with a simple starvation model

Journal article published in 2017 by Thales A. Gutcke ORCID, Andrea V. Macciò, Aaron A. Dutton, Greg S. Stinson
This paper is available in a repository.
This paper is available in a repository.

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Preprint: archiving allowed
Green circle
Postprint: archiving allowed
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Published version: archiving allowed
Data provided by SHERPA/RoMEO

Abstract

The decrease in star formation (SF) and the morphological change necessary to produce the $z=0$ elliptical galaxy population are commonly ascribed to a sudden quenching event, which is able to rid the central galaxy of its cold gas reservoir in a short time. Following this event, the galaxy is able to prevent further SF and stay quiescent via a maintenance mode. We test whether such a quenching event is truly necessary using a simple model of quiescence. In this model, hot gas (all gas above a temperature threshold) in a $∼10^{12} M_{⊙}$ halo mass galaxy at redshift $z∼3$ is prevented from cooling. The cool gas continues to form stars at a decreasing rate and the galaxy stellar mass, morphology, velocity dispersion and position on the color magnitude diagram (CMD) proceed to evolve. By $z=0$, the halo mass has grown to $10^{13} M_{⊙}$ and the galaxy has attained characteristics typical of an observed $z=0$ elliptical galaxy. Our model is run in the framework of a cosmological, smooth particle hydrodynamic code which includes SF, early stellar feedback, supernova feedback, metal cooling and metal diffusion. Additionally, we post-process our simulations with a radiative transfer code to create a mock CMD. In contrast to previous assumptions that a pure "fade away" model evolves too slowly to account for the sparsity of galaxies in the "green valley", we demonstrate crossing times of $