THE EVOLUTION OF QSO SPECTRA

被引：21

作者：

FRANCIS, PJ ^{[1
]}

KORATKAR, A ^{[1
]}

机构：

[1] SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1995年 / 274卷 / 02期

关键词：

QUASARS; EMISSION LINES; GENERAL; ULTRAVIOLET; GALAXIES;

D O I：

10.1093/mnras/274.2.504

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the rest-frame UV spectra of two samples of QSOs, a low-redshift (z similar to 0.4) sample drawn from the IUE archives, and a high-redshift (z similar to 2.2), optically selected sample, the Large Bright QSO Survey (LBQS). The samples overlap substantially in their range of absolute magnitudes and radio properties, allowing us to study directly the evolution of QSO spectra between redshift z similar to 2 and the present. We find strong evidence for spectral evolution of QSOs. At high redshifts only, we see a new population of radio-quiet QSOs with unusually compact broad-emission-line regions. No significant evolution is seen in the spectra of radio-loud QSOs. We also find that Nv (124.0-nm) emission is weaker in radio-loud QSOs, and that the Baldwin effect is stronger in the red wing of C IV than in the blue.

引用

页码：504 / 518

页数：15

共 40 条

[1] THE ULTRAVIOLET CALIBRATION OF THE HUBBLE SPACE TELESCOPE .4. ABSOLUTE IUE FLUXES OF HUBBLE SPACE TELESCOPE STANDARD STARS
BOHLIN, RC
HARRIS, AW
HOLM, AV
GRY, C
[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1990, 73 (03) : 413 - 439
[2] THE ULTRAVIOLET CALIBRATION OF THE HUBBLE SPACE TELESCOPE .2. A CORRECTION FOR THE CHANGE IN SENSITIVITY OF THE SWP CAMERA ON THE IUE
BOHLIN, RC
GRILLMAIR, CJ
[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1988, 66 (02) : 209 - 226
[3] THE EMISSION-LINE PROPERTIES OF LOW-REDSHIFT QUASI-STELLAR OBJECTS
BOROSON, TA
GREEN, RF
[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1992, 80 (01) : 109 - 135
[4] BOYLE BJ, 1990, MON NOT R ASTRON SOC, V243, P231
[5] THE INTERMEDIATE LINE REGION OF QSOS
BROTHERTON, MS
WILLS, BJ
FRANCIS, PJ
STEIDEL, CC
[J]. ASTROPHYSICAL JOURNAL, 1994, 430 (02) : 495 - 504
[6] STATISTICS OF QSO BROAD EMISSION-LINE PROFILES .2. THE C-IV LAMBDA-1549, C-III LAMBDA-1909, AND MG-II LAMBDA-2798 LINES
BROTHERTON, MS
WILLS, BJ
STEIDEL, CC
SARGENT, WLW
[J]. ASTROPHYSICAL JOURNAL, 1994, 423 (01) : 131 - 142
[7] MANIFESTATIONS OF A COSMOLOGICAL DENSITY OF COMPACT OBJECTS IN QUASAR LIGHT
CANIZARES, CR
[J]. ASTROPHYSICAL JOURNAL, 1982, 263 (02) : 508 - 517
[8] THE LARGE, BRIGHT QSO SURVEY .4. QSOS IN 2 EQUATORIAL FIELDS
CHAFFEE, FH
FOLTZ, CB
HEWETT, PC
FRANCIS, PJ
WEYMANN, RJ
MORRIS, SL
ANDERSON, SF
MACALPINE, GM
[J]. ASTRONOMICAL JOURNAL, 1991, 102 (02) : 461 - 487
[9] INITIAL LIGHT-CURVE OF Q2237+0305
CORRIGAN, RT
IRWIN, MJ
ARNAUD, J
FAHLMAN, GG
FLETCHER, JM
HEWETT, PC
HEWITT, JN
LEFEVRE, O
MCCLURE, R
PRITCHET, CJ
SCHNEIDER, DP
TURNER, EL
WEBSTER, RL
YEE, HKC
[J]. ASTRONOMICAL JOURNAL, 1991, 102 (01) : 34 - 40
[10] DELCANTON JJ, 1994, APJ, V424, P550

← 1 2 3 4 →