Do bulges stop stars forming?
Stephen Eales, Oliver Eales, Pieter de Vis

TL;DR
This study investigates whether bulges suppress star formation in galaxies, finding that while bulges may contribute to reduced star-formation efficiency, other processes also play significant roles.
Contribution
It provides observational evidence that bulges can reduce star-formation efficiency but are not the sole factor, highlighting the complexity of galaxy evolution.
Findings
Galaxies with prominent bulges have lower star-formation efficiencies.
A strong correlation exists between star-formation efficiency and specific star-formation rate in non-bulge galaxies.
Galaxies with bars show slightly higher star-formation efficiencies.
Abstract
In this paper, we use the Herschel Reference Survey to make a direct test of the hypothesis that the growth of a stellar bulge leads to a reduction in the star-formation efficiency of a galaxy (or conversely a growth in the gas-depletion timescale) as a result of the stabilisation of the gaseous disk by the gravitational field of the bulge. We find a strong correlation between star-formation efficiency and specific star-formation rate in galaxies without prominent bulges and in galaxies of the same morphological type, showing that there must be some other process besides the growth of a bulge that reduces the star-formation efficiency in galaxies. However, we also find that galaxies with more prominent bulges (Hubble types E to Sab) do have significantly lower star-formation efficiencies than galaxies with later morphological types, which is at least consistent with the hypothesis that…
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