GRAVITATIONAL LENSING AND EVOLUTION IN QUASAR ABSORPTION SYSTEMS

被引：14

作者：

THOMAS, PA ^{[1
]}

WEBSTER, RL ^{[1
]}

机构：

[1] UNIV TORONTO,CANADIAN INST THEORET ASTROPHYS,TORONTO M5S 1A1,ONTARIO,CANADA

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 349卷 / 02期

关键词：

Gravitational lenses; Quasars;

D O I：

10.1086/168327

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present tests of both evolution and the bias due to gravitational lensing in the number density of metal absorption-line systems in quasar spectra. No evidence is found for evolution except perhaps in the high equivalent width systems, where gravitational lensing may affect the statistics. We propose a model in which the distribution of high equivalent width systems reflects clustering of an unevolving low equivalent width population.

引用

页码：437 / 442

页数：6

共 14 条

[1]

Bergeron J., 1988, IAU S, P343

[2] C-IV ABSORPTION SYSTEMS IN QSO SPECTRA - IS THE CHARACTER OF SYSTEMS WITH ZABS-ALMOST-EQUAL-TO-ZEM DIFFERENT FROM THOSE WITH ZABS-LESS-THAN-ZEM [J].

FOLTZ, CB ;

WEYMANN, RJ ;

PETERSON, BM ;

SUN, L ;

MALKAN, MA ;

CHAFFEE, FH .

ASTROPHYSICAL JOURNAL, 1986, 307 (02) :504-534

[3] AN ABSORPTION-LINE SURVEY OF 32 QSOS AT RED WAVELENGTHS - PROPERTIES OF THE MG-II ABSORBERS [J].

LANZETTA, KM ;

TURNSHEK, DA ;

WOLFE, AM .

ASTROPHYSICAL JOURNAL, 1987, 322 (02) :739-769

[4]

Press WP, 1986, NUMERICAL RECIPES, P472

[5] C-IV ABSORPTION IN A NEW SAMPLE OF 55 QSOS - EVOLUTION AND CLUSTERING OF THE HEAVY-ELEMENT ABSORPTION REDSHIFTS [J].

SARGENT, WLW ;

BOKSENBERG, A ;

STEIDEL, CC .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1988, 68 (04) :539-641

[6] A SURVEY OF LYMAN-LIMIT ABSORPTION IN THE SPECTRA OF 59 HIGH-REDSHIFT QSOS [J].

SARGENT, WLW ;

STEIDEL, CC ;

BOKSENBERG, A .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1989, 69 (04) :703-761

[7] MG-II ABSORPTION IN THE SPECTRA OF HIGH AND LOW REDSHIFT QSOS [J].

SARGENT, WLW ;

STEIDEL, CC ;

BOKSENBERG, A .

ASTROPHYSICAL JOURNAL, 1988, 334 (01) :22-33

[8] QSO ABSORPTION-LINES AND THE TIME SCALE FOR INITIAL HEAVY ELEMENT ENRICHMENT IN GALAXIES [J].

STEIDEL, CC ;

SARGENT, WLW ;

BOKSENBERG, A .

ASTROPHYSICAL JOURNAL, 1988, 333 (01) :L5-L8

[9]

SURDEJ J, 1988, ASTRON ASTROPHYS, V198, P49

[10] THE STATISTICS OF GRAVITATIONAL LENSES - THE DISTRIBUTIONS OF IMAGE ANGULAR SEPARATIONS AND LENS REDSHIFTS [J].

TURNER, EL ;

OSTRIKER, JP ;

GOTT, JR .

ASTROPHYSICAL JOURNAL, 1984, 284 (01) :1-22

← 1 2 →