Analysis of the Effect of Bars on Environmental Dependence of Disc Galaxies with MaNGA Survey Data

TL;DR

This study uses MaNGA survey data to analyze how bars in disc galaxies influence the environmental dependence of their properties, finding that bars weaken the impact of environment on galaxy characteristics.

Contribution

It provides new insights into the role of bars in moderating environmental effects on disc galaxy properties using a large, volume-limited MaNGA sample.

Findings

Unbarred galaxies show strong environmental dependence in key properties.

Barred galaxies exhibit weaker environmental dependence in their properties.

Bars reduce the influence of environment on galaxy evolution indicators.

Abstract

Bars are fundamental structures in disc galaxies, although their role in galaxy evolution is still not fully known. This study investigates the effect of the presence of bars on the environmental dependence of disc galaxies' properties using the volume-limited sample from Mapping Nearby Galaxies at APO (MaNGA) survey. The disc galaxies with and without bars samples were obtained using the Galaxy Zoo 2 project then assigned into isolated and non-isolated sub-samples. These sub-samples were used to compare the stellar mass, star formation rate, $g-r$ colour, concentration index and gas phase metallicity, and their relationships between isolated and non-isolated environments. Then these are used to investigate if there is an existence of any difference between galaxies with and without bars. A one-to-one correspondence between isolated and non-isolated galaxy properties was observed, and a strong dependence on the environment for properties of unbarred galaxies was observed when compared to barred. The stellar mass against star formation rate, $g-r$ colour against concentration index and stellar mass against gas phase metallicity of unbarred galaxies strongly depend on environment while for barred these relations weakly depend on environment. The study concludes that bars in disc galaxies decrease the dependence of analysed properties and their relations on the environment.