Ideue, Y. and Taniguchi, Y. (2013) The Role of Galaxy Interaction in Environmental Dependence of Star Formation Activity at z ∼ 1.2. In: Galaxy Mergers in an Evolving Universe. Astronomical Society of the Pacific Conference Series. No.477. Astronomical Society of the Pacific , San Francisco, CA, pp. 163-166. ISBN 978-1-58381-838-1 http://resolver.caltech.edu/CaltechAUTHORS:20150710-080757232
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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 deg^2 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* ≥ 10^(10) 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* ≤ 10^(10) 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* ≥ 10^(10) M☉.
|Item Type:||Book Section|
|Additional Information:||© 2013 Astronomical Society of the Pacific. This work was financially supported in part by the Japan Society for the Promotion of Science (Nos. 17253001, 1934006, 23244031, and 23654068). YI is financially supported by the Japan Society for the Promotion of science (JSPS) though JSPS Research Fellowship for Young Scientists.|
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|Deposited By:||Tony Diaz|
|Deposited On:||14 Jul 2015 16:09|
|Last Modified:||14 Jul 2015 16:09|
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