NOAO >   Observing Info >   Approved Programs >   2007A-0160

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Proposal Information for 2007A-0160


PI: Tomotsugu Goto, Japan Aerospace Exploration Agency, tomo@ir.isas.jaxa.jp
Address: Infrared, 3-1-1 Yoshinodai,, Sagamihara, Kanagawa 2298510, Japan

Title: A search for highest redshift QSOs and faint z>5.8 QSOs

Abstract: High-redshift QSOs are highly important objects in various scientific aspects. For example, their spectra will reveal the onset of reionization of the intergalactic medium (Gunn-Peterson trough). We propose a KPNO4m/MARS long-slit spectroscopy of our highest redshift QSO candidates at z>6.43 (and faint >5.8 QSOs) carefully selected from the Sloan Digital Sky Survey (SDSS) as z-band only detections. All of our targets were followed-up with our extensive J-band imaging and have promising i-z-J color to be a QSO. Early this year we successfully found a new QSO at z=5.96 (Goto 2006,MNRAS,371,769). Our successful discovery of a new QSO at z=5.96 proves that our methodology works well and we wish to expand our survey. Note that we specifically target fainter objects than the previous surveys in order to find even higher redshift QSOs at z>6.43 and intrinsically dim QSOs at z>5.8.


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