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

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/39394

Title:	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
Authors:	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
Contributors:	物理研究所
Keywords:	SEYFERT-GALAXIES;STANDARD STARS;VARIABILITY;QUASARS
Date:	1991
Issue Date:	2010-07-08 14:14:34 (UTC+8)
Publisher:	中央大學
Abstract:	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.
Relation:	ASTROPHYSICAL JOURNAL
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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