STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .2. AN INTENSIVE STUDY OF NGC-5548 AT OPTICAL WAVELENGTHS

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题名:	STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .2. AN INTENSIVE STUDY OF NGC-5548 AT OPTICAL WAVELENGTHS
作者:	PETERSON,BM;BALONEK,TJ;BARKER,ES;BECHTOLD,J;BERTRAM,R;BOCHKAREV,NG;BOLTE,MJ;BOND,D;BOROSON,TA;CARINI,MT;CARONE,TE;CHRISTENSEN,JA;CLEMENTS,SD;COCHRAN,AL;COHEN,RD;CRAMPTON,D;DIETRICH,M;ELVIS,M;FERGUSON,A;FILIPPENKO,AV
贡献者:	物理研究所
关键词:	SEYFERT-GALAXIES;STANDARD STARS;VARIABILITY;QUASARS
日期:	1991
上传时间:	2010-07-08 14:14:34 (UTC+8)
出版者:	中央大學
摘要:	We report on a large, international program of ground-based optical spectroscopy and photometry of the variable Seyfert 1 galaxy NGC 5548 undertaken in support of an IUE monitoring campaign described by Clavel and coworkers. In this contribution, we present the data base and describe the methods used to correct for systematic differences between spectra from different sources. Optical continuum and H-beta emission-line continuum is qualitatively the same as the ultraviolet and optical continuum measurements the behavior of the ultraviolet continuum. Cross-correlation of the ultraviolet and optical continuum measurements does not reveal any significant lag between them. The H-beta does not reveal any significant lag between them. The H-beta emission-line variations show the same basic pattern as seen in the continuum and ultraviolet emission lines, with H-beta lagging behind the continuum by approximately 20 days. This is significantly larger than the approximately 10 day lag deduced for Ly-alpha.
關聯:	ASTROPHYSICAL JOURNAL
显示于类别:	[物理研究所] 期刊論文

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