Canada France Redshift Survey .10. The quasar sample

被引:15
作者
Schade, D
Crampton, D
Hammer, F
LeFevre, O
Lilly, SJ
机构
[1] NATL RES COUNCIL CANADA,DOMINION ASTROPHYS OBSERV,VICTORIA,BC V8X 4M6,CANADA
[2] OBSERV MEUDON,DAEC,F-92195 MEUDON,FRANCE
[3] CANADA FRANCE HAWAII TELESCOPE CORP,KAMUELA,HI 96743
关键词
surveys; galaxies; fundamental parameters; quasars; general; cosmology; observations;
D O I
10.1093/mnras/278.1.95
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Six objects with broad emission lines and redshifts from 0.48 to 2.07 were discovered among 736 extragalactic objects in the Canada-France Redshift Survey (CFRS). Although the luminosities of half of the objects are such that they are in the Seyfert regime (M(B) > -23), all would be designated as quasars in traditional surveys. Since the only selection criterion was that 17.5 <less than or equal to I-AB less than or equal to 22.5, or approximately B < 23 (assuming a continuum power-law slope alpha = -0.5), these quasars represent an unbiased, flux-limited sample. Although uncertain, the implied surface density, 200(-80)(+120) deg(-2), is the highest yet measured, and is in good agreement with extrapolations from other faint surveys and the evolving luminosity function models of Boyle. The distributions of the continuum properties, emission-line strengths, etc. of the quasars do not differ significantly from those of quasars selected by other means, and therefore they would have been detected in most traditional surveys. Three of the quasars may be associated with clusters or large structures of galaxies at z > 1.
引用
收藏
页码:95 / 100
页数:6
相关论文
共 24 条
[1]   DEEP X-RAY SOURCE COUNTS FROM A FLUCTUATION ANALYSIS OF ROSAT PSPC IMAGES [J].
BARCONS, X ;
BRANDUARDIRAYMONT, G ;
WARWICK, RS ;
FABIAN, AC ;
MASON, KO ;
MCHARDY, I ;
ROWANROBINSON, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1994, 268 (04) :833-840
[2]   A SPECTROSCOPIC SURVEY OF FAINT QSOS [J].
BOYLE, BJ ;
JONES, LR ;
SHANKS, T .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 251 (03) :482-507
[3]  
BOYLE BJ, 1991, ANN NY ACAD SCI, V647, P14
[4]   A SPECTROSCOPIC SURVEY OF FAINT COMPACT OBJECTS [J].
COLLESS, M ;
ELLIS, RS ;
TAYLOR, K ;
SHAW, G .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 253 (04) :686-&
[5]  
CRAMPTON D, 1995, IN PRESS APJ
[6]   ATLAS OF QUASAR ENERGY-DISTRIBUTIONS [J].
ELVIS, M ;
WILKES, BJ ;
MCDOWELL, JC ;
GREEN, RF ;
BECHTOLD, J ;
WILLNER, SP ;
OEY, MS ;
POLOMSKI, E ;
CUTRI, R .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1994, 95 (01) :1-68
[7]   A HIGH SIGNAL-TO-NOISE RATIO COMPOSITE QUASAR SPECTRUM [J].
FRANCIS, PJ ;
HEWETT, PC ;
FOLTZ, CB ;
CHAFFEE, FH ;
WEYMANN, RJ ;
MORRIS, SL .
ASTROPHYSICAL JOURNAL, 1991, 373 (02) :465-470
[8]   AN OBJECTIVE CLASSIFICATION SCHEME FOR QSO SPECTRA [J].
FRANCIS, PJ ;
HEWETT, PC ;
FOLTZ, CB ;
CHAFFEE, FH .
ASTROPHYSICAL JOURNAL, 1992, 398 (02) :476-490
[9]   CONFIDENCE-LIMITS FOR SMALL NUMBERS OF EVENTS IN ASTROPHYSICAL DATA [J].
GEHRELS, N .
ASTROPHYSICAL JOURNAL, 1986, 303 (01) :336-346
[10]  
HAMMER F, 1995, IN PRESS APJ