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| Paper: |
The Role of Galaxy Interaction in Environmental Dependence of Star Formation Activity at z ∼ 1.2 |
| Volume: |
477, Galaxy Mergers in an Evolving Universe |
| Page: |
163 |
| Authors: |
Ideue, Y.; Taniguchi, Y.; COSMOS Team |
| Abstract: |
In order to understand environmental effects on star formation in high-redshift
galaxies, we investigate the physical relationships between the star formation
activitiy, stellar mass, and environment for z ≃ 1.2 galaxies in the 2 deg2
COSMOS field. We estimate star formation using the [O II]λ 3727 emission
line and environment from the local galaxy density. Our analysis shows that for massive
(M* ≥ 1010 M☉), the fraction of [O II] emitters in high-density
environments is roughly two times higher than in low-density environments,
while the [O II] emitter fraction does not depend on environment for low-mass
M* ≤ 1010 M☉ galaxies. In order to understand what drives these
trends, we investigate the role of companion galaxies in our sample.
We find massive [O II] emitters are more likely to have companions in high-density
environments. These results suggest that interactions and/or mergers in high-density
environment could induce star formation in massive galaxies at z ≃ 1.2,
increasing the fraction of star-forming galaxies with M* ≥ 1010 M☉. |
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