SPECTRAL MONITORING OF POWERFUL RADIO-SOURCES

被引：0
|
作者：
HOOIMEYER, JRA
MILEY, GK
DEWAARD, GJ
SCHILIZZI, RT
机构：
[1] LEIDEN OBSERV, POB 9513, 2300 RA LEIDEN, NETHERLANDS
[2] NETHERLANDS FDN RES ASTRON, 7990 AA DWINGELOO, NETHERLANDS
[3] FOKKER AEROSP, AMSTERDAM, NETHERLANDS
来源：
ASTRONOMY & ASTROPHYSICS | 1992年 / 261卷 / 01期
关键词：
GALAXIES; ACTIVE; LINES; PROFILE; QUASARS; GENERAL; RADIO SOURCES; SPECTROSCOPY;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
High-resolution (approximately 1.5 angstrom) optical spectra of the wave-length range around H-beta lambda-4861 have been obtained for four quasars (PKS 0736 + 017, 4C 31.45, 3C 263 and 3C 273) and one Seyfert 1 galaxy (3C 120). For three sources, 3C 120, PKS 0736 + 017 and 3C 273, two or more spectra were made at time intervals of 1-1.5 yr. There is evidence for a mild variability of the broad H-beta line in all three objects; this is most marked in the case of 3C 120. Light travel time arguments then infer the dimensions of the BLR to be of the order of a lightyear or less, assuming the BLR clouds to be spherically distributed.
引用
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页码：9 / 17
页数：9
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