2015ApJ...806..208S -
Astrophys. J., 806, 208 (2015/June-3)
Galaxy formation at z > 3 revealed by narrowband-selected [O III] emission line galaxies.
SUZUKI T.L., KODAMA T., TADAKI K.-I., HAYASHI M., KOYAMA Y., TANAKA I., MINOWA Y., SHIMAKAWA R. and YAMAMOTO M.
Abstract (from CDS):
We present the physical properties of [O III] emission line galaxies at z > 3 as the tracers of active galaxies at 1 Gyr before the peak epoch at z ∼ 2. We have performed deep narrowband imaging surveys in the Subaru/XMM-Newton Deep Survey Field with the Multi-object InfraRed Camera and Spectrograph on the Subaru Telescope and have constructed coherent samples of 34 [O iii] emitters at z = 3.2 and 3.6, as well as 107 Hα emitters at z = 2.2 and 2.5. We investigate their basic physical quantities, such as stellar masses, star formation rates (SFRs), and sizes, using the publicly available multiwavelength data and high-resolution images from the Hubble Space Telescope. The stellar masses and SFRs show a clear correlation known as the ''main sequence'' of star-forming galaxies. It is found that the location of the main sequence of the [O III] emitters at z = 3.2 and 3.6 is almost identical to that of the Hα emitters at z = 2.2 and 2.5. Also, we investigate their mass-size relation and find that the relation does not change between the two epochs. When we assume that the star-forming galaxies at z = 3.2 grow simply along the same main sequence down to z = 2.2, galaxies with M* = 109- 1011 M☉ increase their stellar masses significantly by a factor of 10-2. They climb up the main sequence, and their SFRs also increase a lot as their stellar masses grow. This indicates that star formation activities of galaxies are accelerated from z > 3 toward the peak epoch of galaxy formation at z∼ 2.
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Journal keyword(s):
galaxies: evolution - galaxies: formation - galaxies: high-redshift
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