Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-08-28
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted to PASJ for publication
Scientific paper
We obtained mid-infrared 3.6 and 4.5 micron imaging of a z=6.96 Lyman alpha emitter (LAE) IOK-1 discovered in the Subaru Deep Field, using Spitzer Space Telescope Infrared Array Camera observations. After removal of a nearby bright source, we find that IOK-1 is not significantly detected in any of these infrared bands to m_3.6 ~ 24.00 and m_4.5 ~ 23.54 at 3 sigma. Fitting population synthesis models to the spectral energy distribution consisting of the upper limit fluxes of the optical to infrared non-detection images and fluxes in detection images, we constrain the stellar mass M* of IOK-1. This LAE could have either a mass as low as M* <~ 2-9 x 10^8 Msun for the young age (<~ 10 Myr) and the low dust reddening (A_V ~ 0) or a mass as large as M* <~ 1-4 x 10^{10} Msun for either the old age (> 100 Myr) or the high dust reddening (A_V ~ 1.5). This would be within the range of masses of z ~ 3-6.6 LAEs studied to date, ~ 10^6-10^{10} Msun. Hence, IOK-1 is not a particularly unique galaxy with extremely high mass or low mass but is similar to one of the LAEs seen at the later epochs.
Hattori Takashi
Hayashi Masao
Iye Masanori
Kashikawa Nobunari
Ly Chun
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