THE INFRARED MEDIUM-DEEP SURVEY. V. A NEW SELECTION STRATEGY FOR QUASARS AT z > 5 BASED ON MEDIUM-BAND OBSERVATIONS WITH SQUEAN

• DOI: 10.5303/jkas.2016.49.1.25
• Publication Date: 2016-05-29T21:21:56Z
• Authors: YISEUL JEON; MYUNGSHIN IM; SOOJONG PAK; MINHEE HYUN; SANGHYUK KIM; YONGJUNG KIM; HYE-IN LEE; WOOJIN PARK
• Keywords: OVV quasar; Photometric redshift; Spectral energy distribution

Multiple color selection techniques are successful in identifying quasars from wide-field broadband imaging survey data. Among the that have been discovered so far, however, there is a redshift gap at 5 ≲ z 5.7 due to limitations of filter sets previous studies. In this work, we present new technique high using sequence medium-band filters: nine filters with central wavelengths 625 1025 nm and bandwidths 50 nm. Photometry these medium-bands traces spectral energy distribution (SED) source, similar spectroscopy resolution R ~ 15. By conducting observations 4.7 ≤ 6.0 brown dwarfs (the main contaminants quasar selection) SED camera for QUasars EArly uNiverse (SQUEAN) on 2.1-m telescope McDonald Observatory, show superior multi-color broad-band section separating dwarfs. addition, redshifts can be determined an accuracy Δz/(1 + z) = 0.002 - 0.026. The extended 7, suggesting observation powerful even re-ionization epoch.