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APM Z ≥ 4 QSO Survey: Spectra and Intervening Absorption Systems

Storrie-Lombardi, L. J. and McMahon, R. G. and Irwin, M. J. and Hazard, C. (1996) APM Z ≥ 4 QSO Survey: Spectra and Intervening Absorption Systems. Astrophysical Journal, 468 (9). pp. 121-138. ISSN 0004-637X. doi:10.1086/177676.

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The APM multicolor survey for bright z > 4 objects, covering 2500 deg^2 of sky to m_r ~ 19, resulted in the discovery of 31 quasars with z ≳ 4. High signal-to-noise optical spectrophotometry at 5 Å resolution has been obtained for the 28 quasars easily accessible from the northern hemisphere. These spectra have been surveyed to create new samples of high-redshift Lyman-limit systems, damped Lyα absorbers, and metal absorption systems (e.g., C IV and Mg II). In this paper we present the spectra, together with line lists of the detected absorption systems. The QSOs display a wide variety of emission- and absorption-line characteristics, with five exhibiting broad absorption lines and one with extremely strong emission lines (BR 2248 - 1242). Eleven candidate damped Lyα absorption systems have been identified covering the redshift range 2.8 ≤ z ≤ 4.4 (eight with z > 3.5). An analysis of the measured redshifts of the high-ionization emission lines with the low-ionization lines shows them to be blueshifted by 430 ± 60 km s^(-1). In a previous paper (by Storrie-Lombardi et al.) we discussed the redshift evolution of the Lyman limit systems cataloged here. In subsequent papers we will discuss the properties of the Lyα forest absorbers and the redshift and column density evolution of the damped Lyα absorbers.

Item Type:Article
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URLURL TypeDescription Paper
Storrie-Lombardi, L. J.0000-0002-5987-5210
Additional Information:© 1996 American Astronomical Society. Received 1995 October 11; accepted 1996 March 15. We thank an anonymous referee and Mike Fall for suggestions that improved the paper and Art Wolfe for the use of his code in the automated damped candidate selection. We thank the PATT for time awarded to do the observations with the William Herschel Telescope that made this work possible. L. S. L. acknowledges support from an Isaac Newton Studentship, the Cambridge Overseas Trust, and a University of California President's Postdoctoral Fellowship. R. G. M. acknowledges the support of the Royal Society.
Funding AgencyGrant Number
Isaac Newton StudentshipUNSPECIFIED
Cambridge Overseas TrustUNSPECIFIED
University of CaliforniaUNSPECIFIED
Subject Keywords:quasars: absorption lines quasars: emission lines quasars: general
Issue or Number:9
Record Number:CaltechAUTHORS:20170322-151955954
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Official Citation:APM Z >= 4 QSO Survey: Spectra and Intervening Absorption Systems Storrie-Lombardi, L. J., McMahon, R. G., Irwin, M. J., & Hazard, C. Astrophysical Journal v.468, p.121-138
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75323
Deposited By: Ruth Sustaita
Deposited On:22 Mar 2017 22:49
Last Modified:15 Nov 2021 16:32

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