NOAO >   Observing Info >   Approved Programs >   2013B-0534

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Proposal Information for 2013B-0534


PI: Yiseul Jeon, Seoul National University, ysjeon@astro.snu.ac.kr
Address: Department of Physics and Astronomy, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, South Korea

CoI: Myungshin Im, Seoul National University
CoI: Soojong Pak, Kyung Hee University
CoI: Won-Kee Park, Korea Astronomy and Space Science Institute
CoI: Changsu Choi, Seoul National University
CoI: Dohyeong Kim, Seoul National University

Title: Optical Spectroscopic Observation of z~5 Quasar Candidates

Abstract: We propose to perform optical spectroscopic observation of quasar candidates at 5 < z < 5.7 with z < 19.5 AB mag. The redshift range corresponds to a gap in the epoch between the early, vigorous evolution of super massive black holes (SMBHs) at z ~ 6-7 and the epoch (z ~ 4) where more established, the most massive SMBHs ~10^10 M_\odot are identified in active galaxy. In addition, the rapid evolution in the fraction of HI in the intergalactic medium (IGM) is coming to an end at this epoch. The number of quasars at this redshift range, however, is still small due to technical limitations of current large area surveys. Since 2009, we have been conducting a quasar survey in multi-bands, including data from our custom designed Is and Iz filters. Together with WISE data, we selected 29 high redshift quasar candidates in ~3,400 deg^2 area so far. In 2012B and 2013A, we were granted 5.5 nights of KP-4m time in January and May 2013. However due to poor weather conditions, we could not accomplish the confirmation of our candidates during the January run. Adding additional candidates with new datasets, we propose to observe the remaining quasar candidates that are only accessible during 2013B. We would like to (i) identify their redshifts; (ii) measure their black hole masses; and (iii) estimate IGM optical depth at z ~ 5. Our observation will contribute towards the understanding of the rapid evolution of SMBHs and the IGM ionization state between 5 < z < 5.7. The result will also be used to improve the selection technique.


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