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Title:
Strong Emission-Line Galaxies at Low Redshifts in the Field around the Quasar SDSSp J104433.04-012502.2
Authors:
Ajiki, Masaru; Shioya, Yasuhiro; Taniguchi, Yoshiaki; Murayama, Takashi; Nagao, Tohru; Sasaki, Shunji S.; Sumiya, Ryoko; Morioka, Taichi; Hatakeyama, Yuichiro; Yokouchi, Asuka; Takahashi, Mari I.; Koizumi, Osamu
Affiliation:
AA(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AB(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AC(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AD(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AE(INAF -- Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy; National Astronomical Observatory, Osawa, Mitaka, Tokyo 181-8588) AF(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AG(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AH(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AI(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AJ(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AK(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AL(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578)
Publication:
Publications of the Astronomical Society of Japan, Vol.58, No.1, pp. 113-130 (PASJ Homepage)
Publication Date:
02/2006
Origin:
PASJ
Keywords:
galaxies: evolution, galaxies: formation
Bibliographic Code:
2006PASJ...58..113A

Abstract

We discuss the observational properties of strong emission-line galaxies at low redshifts found by our deep imaging survey for high-redshift Lyα emitters. In our survey, we used a narrow-band filter, NB816 (λcenter = 8150 Å with FWHM = 120 Å), and an intermediate-band filter, IA827 (λcenter = 8270Å with FWHM = 340 Å). In this survey, 62 NB816-excess (> 0.9mag) and 21 IA827-excess (> 0.8mag) objects were found. Among them, we found 20 NB816-excess and 4 IA827-excess Lyα emitter candidates. Therefore, it turns out that 42 NB816)-excess and 17 IA827-excess objects are strong emission-line objects at lower redshifts. Since 4 objects in the two low-z samples are common, the total number of strong low-z emitters is 55. Applying our photometric redshift technique, we identified 7 Hα emitters at z ≈ 0.24, 20 Hβ-[O III ] ones at z ≈ 0.65, and 11 [O II] ones at z ≈ 1.19. However, we could not determine reliable photometric redshifts of the remaining 17 emitters. The distributions of their rest frame equivalent widths are consistently understood based on recent studies of galaxy evolution from z ˜ 1 to z ˜ 0.
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