The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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Faint Quasar Candidates at z~5 in the ELAIS-N1 field

  • Shin, Suhyun (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Im, Myungshin (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Kim, Yongjung (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Hyun, Minhee (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Jeon, Yiseul (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Kim, Minjin (Korea Astronomy and Space Science Institute) ;
  • Kim, Dohyeong (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Kim, Jae-Woo (Korea Astronomy and Space Science Institute) ;
  • Taak, Yoon Chan (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Yoon, Yongmin (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Choi, Changsu (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Hong, Jueun (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Jun, Hyunsung David (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Karouzos, Marios (Nature Astronomy) ;
  • Kim, Duho (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Kim, Ji Hoon (Subaru Telescope, National Astronomical Observatory of Japan) ;
  • Lee, Seong-Kook (Center fore the Exploration of the Origin of the Universe (CEOU)) ;
  • Pak, Soojong (School of Space Research and Institute of Natural Sciences, Kyung Hee University) ;
  • Park, Won-Kee (Korea Astronomy and Space Science Institute)
  • Published : 2017.10.10
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Abstract

Faint quasars are important to test the possibility that quasars are the main contributor to the cosmic reionization. However, it has been difficult to find faint quasars due to the lack of deep, wide-field imaging data. In this poster, we present our efforts to find faint quasars in the ELAIS-N1 field through the deep data (iAB ~ 25) obtained by the Subaru Hyper Suprime-Cam (HSC) Strategic Program survey. To select reliable quasar candidate, we also use the near-infrared (NIR) data of the Infrared Medium-deep Survey (IMS) and the UKIRT Infrared Deep Sky Survey (UKIDSS) - Deep Extragalactic Survey (DXS). Using multiple-band color cuts, we select high redshift quasar candidates. To confirm them as high redshift quasars, candidates are observed by the SED camera for QUasars in EArly uNiverse (SQUEAN) instrument in several medium band filters that can sample the redshifted Lyman break efficiency. The quasar sample will be used to study the growth of BH and stellar mass, the relation between the quasar activity and the host galaxy, and their contribution to the cosmic re-ionization.

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