Eric M. Monier et al. 2002 The Astronomical Journal 124 2971 doi:10.1086/344076
Eric M. Monier1,2, Julia D. Kennefick2,3, Patrick B. Hall2,4,7, Patrick S. Osmer1, Malcolm G. Smith5, Gavin B. Dalton3 and Richard F. Green2,6
Show affiliationsThe BTC40 Survey for high-redshift quasars is a multicolor search using images obtained with the Big Throughput Camera (BTC) on the Cerro Tololo Inter-American Observatory (CTIO) 4 m telescope in V, I, and z filters to search for quasars at redshifts of 4.8 < z < 6. The survey covers 40 deg2 in B, V, and I, and 36 deg2 in z. Limiting magnitudes (3 σ) reach to V = 24.6, I = 22.9, and z = 22.9. We used the V-I versus I-z two-color diagram to select high-redshift quasar candidates from the objects classified as point sources in the imaging data. Follow-up spectroscopy with the Anglo-Australian Telescope and CTIO 4 m telescopes of candidates having I ≤ 21.5 has yielded two quasars with redshifts of z = 4.6 and z = 4.8, as well as four emission-line galaxies with z ≈ 0.6. Fainter candidates have been identified down to I = 22 for future spectroscopy on 8 m class telescopes.
Issue 5 (2002 November)
Received 2002 May 30, accepted for publication 2002 August 6
Eric M. Monier et al. 2002 The Astronomical Journal 124 2971
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