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The Second APM UKST Colour Survey for z > 4 quasars

Storrie-Lombardi, Lisa J. and Irwin, Michael J. and McMahon, Richard G. and Hook, Isobel M. (2001) The Second APM UKST Colour Survey for z > 4 quasars. Monthly Notices of the Royal Astronomical Society, 322 (4). pp. 933-944. ISSN 0035-8711. doi:10.1046/j.1365-8711.2001.04215.x.

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We present the spectra, positions, and finding charts for 31 bright (R<19.3) colour-selected quasars covering the redshift range z=3.85–4.78, with four having redshifts z>4.5. The majority are in the southern sky (δ<−25°). The quasar candidates were selected for their red (BJ−R≳2.5) colours from UK or POSSII Schmidt Plates scanned at the Automated Plate Measuring (APM) facility in Cambridge. Low-resolution (≳10 Å) spectra were obtained to identify the quasars, primarily at the Las Campanas Observatory. The highest redshift quasar in our survey is at z≈4.8(R=18.7) and its spectrum shows a damped Lyα absorption system at z=4.46. This is currently the highest redshift damped Lyα absorber detected. Five of these quasars exhibit intrinsic broad absorption line features. Combined with the previously published results from the first part of the APM United Kingdom Schmidt Telescope (UKST) survey we have now surveyed a total of ∼8000 deg^2 of sky i.e. 40 per cent of the high galactic latitude (|b|>30°) sky, resulting in 59 optically selected quasars in the redshift range 3.85 to 4.78; 49 of which have z≥4.00.

Item Type:Article
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URLURL TypeDescription
Storrie-Lombardi, Lisa J.0000-0002-5987-5210
Hook, Isobel M.0000-0002-2960-978X
Additional Information:© 2001 Royal Astronomical Society. Accepted 2000 November 10. Received 2000 October 10. We thank the support staff at the Las Campanas, Cerro Tololo, Anglo-Australian, Kitt Peak, and Royal Greenwich Observatories for their assistance in obtaining these observations. We thank the UKSTU for providing the plate material and thank the members of the APM facility, past and present, for maintaining such an excellent system.
Group:Infrared Processing and Analysis Center (IPAC)
Issue or Number:4
Record Number:CaltechAUTHORS:20170322-094302747
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Official Citation:Storrie-Lombardi, L. J., Irwin, M. J., McMahon, R. G. and Hook, I. M. (2001), The Second APM UKST Colour Survey for z > 4 quasars. Monthly Notices of the Royal Astronomical Society, 322: 933–944. doi:10.1046/j.1365-8711.2001.04215.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75307
Deposited By: Ruth Sustaita
Deposited On:22 Mar 2017 17:43
Last Modified:15 Nov 2021 16:32

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