Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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A Y-BAND LOOK OF THE SKY WITH 1-M CLASS TELESCOPES

  • Choi, Chang-Su (CEOU/Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Im, Myung-Shin (CEOU/Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Jeon, Yi-Seul (CEOU/Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Ibrahimov, Mansur (Ulugh Beg Astronomical Institute)
  • Received : 2011.11.16
  • Accepted : 2012.01.02
  • Published : 2012.02.29
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Abstract

Y-band is a broad passband that is centered at ~1 ${\mu}m$. It is becoming a new, popular window for extragalactic study especially for observations of red objects thanks to recent CCD technology developments. In order to better understand the general characteristics of objects in Y-band, and to investigate the promise of Y-band observations with small telescopes, we carried out imaging observations of several extragalactic fields, brown dwarfs, and high redshift quasars with Y-band filter at the Mt. Lemmon Optical Astronomy Observatory and the Maidanak observatory. From our observations, we constrain the bright end of the galaxy and the stellar number counts in Y-band. We also test the usefulness of high redshift quasar (z >6) selection via i - z - Y color-color diagram, to demonstrate that the i - z - Y color-color diagram is effective for the selection of high redshift quasars even with a conventional optical CCD camera installed at a 1-m class telescope.

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