STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .7. VARIABILITY OF THE OPTICAL-SPECTRUM OF NGC-5548 OVER 4 YEARS

被引：83

作者：

PETERSON, BM

BERLIND, P

BERTRAM, R

BOCHKAREV, NG

BOND, D

BROTHERTON, MS

BUSLER, JR

CHUVAEV, KK

COHEN, RD

DIETRICH, M

ELVIS, M

FILIPPENKO, AV

FOLTZ, CB

GARNAVICH, PM

HO, LC

HORINE, E

HORNE, K

HUCHRA, JP

KOLLATSCHNY, W

KORISTA, KT

MALKAN, MA

MATHESON, T

MIGNOLI, M

MORRIS, SL

NAZAROVA, L

PENFOLD, J

PETERS, J

POGGE, RW

PRONIK, VI

RUSH, B

SERGEEV, SG

SHAPOVALOVA, AI

SHIELDS, JC

STIRPE, GM

TOKARZ, S

WAGNER, RM

WEYMANN, RJ

WHITE, RJ

WILKES, BJ

WILLS, D

WILLS, BJ

WINGE, C

YOUNGER, PF

机构：

[1] HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138

[2] MOSCOW MV LOMONOSOV STATE UNIV,STERNBERG ASTRON INST,MOSCOW,RUSSIA

[3] DOMINION ASTROPHYS OBSERV,VICTORIA V8X 4M6,BC,CANADA

[4] UNIV TEXAS,MCDONALD OBSERV,AUSTIN,TX 78712

[5] UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712

[6] UNIV CALGARY,DEPT PHYS & ASTRON,CALGARY T2N 1N4,AB,CANADA

[7] CRIMEAN ASTROPHYS OBSERV,NAUCHNYI 334413,UKRAINE

[8] UNIV CALIF SAN DIEGO,CTR ASTROPHYS & SPACE SCI,LA JOLLA,CA 92093

[9] UNIV STERNWARTE GOTTINGEN,D-37083 GOTTINGEN,GERMANY

[10] UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720

[11] UNIV ARIZONA,MULTIPLE MIRROR TELESCOPE OBSERV,TUCSON,AZ 85721

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

[13] CARNEGIE INST WASHINGTON OBSERV,PASADENA,CA 91101

[14] UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024

[15] OSSERV ASTRON BOLOGNA,I-40126 BOLOGNA,ITALY

[16] ASTRON INST,CAMBRIDGE CB3 0HZ,ENGLAND

[17] ROYAL GREENWICH OBSERV,CAMBRIDGE CB3 0EZ,ENGLAND

[18] MT ROYAL COLL,DEPT MATH PHYS & ENGN,CALGARY T3E 6K6,AB,CANADA

[19] RUSSIAN ACAD SCI,SPECIAL ASTROPHYS OBSERV,STAVROPOLSKY KRAJ 357140,RUSSIA

[20] UNIV FED RIO GRANDE SUL,INST FIS,DEPT ASTRON,BR-91500 PORTO ALEGRE,RS,BRAZIL

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 425卷 / 02期

关键词：

GALAXIES; ACTIVE; INDIVIDUAL; (NGC; 5548); NUCLEI; SEYFERT;

D O I：

10.1086/174009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the results of a continuation of a large monitoring program of optical spectroscopy of the Seyfert 1 galaxy NGC 5548. The new observations presented here were obtained between 1990 December and 1992 October, and extend the existing database to nearly 1400 days, dating back to 1988 December. The continuum variations are generally smooth and well-resolved, except during the third year of this 4 year project, when the variations were apparently more rapid and of lower amplitude than observed at other times. The broad H beta emission line is found to vary in response to the continuum variations with a lag of about Is days, but with some changes from year to year. The H beta transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.

引用

页码：622 / 634

页数：13

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