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Emission line properties of the large bright quasar survey
被引:79
作者:
Forster, K
Green, PJ
Aldcroft, TL
Vestergaard, M
Foltz, CB
Hewett, PC
机构:
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Ohio State Univ, Columbus, OH 43210 USA
[3] Univ Arizona, Multiple Mirror Telescope Observ, Tucson, AZ 85721 USA
[4] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
关键词:
galaxies : active;
quasars : emission lines;
quasars : general;
ultraviolet : galaxies;
D O I:
10.1086/320362
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We present measurements of the optical/UV emission lines for a large homogeneous sample of 993 quasars from the Large Bright Quasar Survey. Our largely automated technique accounts for continuum breaks and galactic reddening, and we perform multicomponent fits to emission line profiles, including the effects of blended iron emission, and of absorption lines both galactic and intrinsic. Here we describe the fitting algorithm and present the results of line fits to the LBQS sample, including upper limits to line equivalent widths when warranted. The distribution of measured line parameters, principally W-lambda and FWHM, are detailed for a variety of lines, including upper limits. We thus initiate a large-scale investigation of correlations between the high-energy continuum and emission lines in quasars, to be extended to complementary samples using similar techniques. High-quality, reproducible measurements of emission lines for uniformly selected samples will advance our understanding of active galaxies, especially in a new era of large surveys selected by a variety of complementary methods.
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页码:35 / 51
页数:17
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