研究成果・発表論文

A Search for Ly\ensuremathα Emitters at Redshift 3.7

Fujita, Shinobu S.,   Ajiki, Masaru,   Shioya, Yasuhiro,   Nagao, Tohru,   Murayama, Takashi,   Taniguchi, Yoshiaki,   Okamura, Sadanori,   Ouchi, Masami,   Shimasaku, Kazuhiro,   Doi, Mamoru,   Furusawa, Hisanori,   Hamabe, Masaru,   Kimura, Masahiko,   Komiyama, Yutaka,   Miyazaki, Masayuki,   Miyazaki, Satoshi,   Nakata, Fumiaki,   Sekiguchi, Maki,   Yagi, Masafumi,   Yasuda, Naoki,   Matsuda, Yuichi,   Tamura, Hajime,   Hayashino, Tomoki,   Kodaira, Keiichi,   Karoji, Hiroshi,   Yamada, Toru,   Ohta, Kouji,   & Umemura, Masayuki


要旨
We present the results of a survey for emission-line objects, based on optical intermediate-band (\ensuremathłambda$_c$=5736 ̊A and \ensuremathΔ\ensuremathłambda=280 \Å) and broadband (B, V, R, and i') observations of the Subaru/XMM-Newton Deep Field with the 8.2 m Subaru telescope and the Subaru Prime Focus Camera (Suprime-Cam). All the data were obtained during the guaranteed time observations of the Suprime- Cam instrument. The intermediate-band image covered a sky area of 10.62′×12.40′\rs̊ebox-0.5ex~132 arcmin$^2$ in the Subaru/XMM-Newton Deep Field (Ouchi et al.). Using this image, we found 23 emission-line sources whose observed emission-line equivalent widths are greater than 250 \r̊. Their optical multicolor properties indicate that six emission-line sources are Ly\ensuremathα emitters at z\raib̊ox-0.5ex~3.7 (\ensuremathΔz\raiso̊x-0.5ex~0.22). They are either intense starburst galaxies or active galactic nuclei-like quasars at z\raisex̊-0.5ex~3.7. Two more emission-line sources may also be Ly\ensuremathα emitters at z\raiseb̊-0.5ex~3.7, although their multicolor properties are marginal. Among the remaining 15 emission-line objects, eight objects appear to be strong emission-line galaxies at lower redshift; e.g., [O II] \ensuremathłambda3727 emitters at z\raisebo-̊0.5ex~0.54, H\ensuremathβ at z\raisebox0̊.5ex~0.18, or [O III] \ensuremathłambda5007 emitters at z\raisebox.̊5ex~0.15. The remaining seven objects are unclassified because they are too faint to be detected in broadband images. We discuss the observational properties of these strong emission-line sources. In particular, our data allow us to estimate the star formation density at z\raisebox-5̊ex~3.7 for the first time. Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.




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