Speaker
Description
Bars represent a common structural feature in disc galaxies, yet their contribution to galaxy evolution remains only partially understood. In this work, we examine how the presence of a bar influences the environmental dependence of various properties of disc galaxies. Our analysis uses a volume-limited sample from the Mapping Nearby Galaxies at APO (MaNGA) survey. Barred and unbarred disc galaxy samples are selected through classifications from the Galaxy Zoo~2 project and subsequently divided into isolated and non-isolated sub-samples. These groups are compared in terms of star formation rate, $g-r$ color, concentration index, and gas-phase metallicity, as well as in the relationships among these quantities across different environments. This approach allows us to assess whether barred and unbarred systems respond differently to environmental conditions.
The comparison reveals a close correspondence between the properties of isolated and non-isolated galaxies, although unbarred galaxies exhibit a pronounced environmental sensitivity. Relations such as stellar mass versus star formation rate, $g-r$ color versus concentration index, and stellar mass versus gas-phase metallicity show strong environmental dependence for unbarred discs, whereas the same trends for barred galaxies display only weak environmental variation. These results indicate that the presence of a bar reduces how strongly the examined properties and their interrelations depend on the surrounding environment.
| Stream | Science or Engineering |
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