An intrinsic Baldwin effect in the Hβ broad emission line in the spectrum of NGC 5548

被引：41

作者：

Gilbert, KM ^{[1
]}

Peterson, BM ^{[1
]}

机构：

[1] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

来源：

ASTROPHYSICAL JOURNAL | 2003年 / 587卷 / 01期

关键词：

galaxies : active; galaxies : individual (NGC 5548); galaxies : nuclei; galaxies : Seyfert;

D O I：

10.1086/368112

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate possibility of an intrinsic Baldwin effect (i.e., nonlinear emission-line response to continuum variations) in the broad Hbeta emission line of the active galaxy NGC 5548 using cross-correlation techniques to remove light-travel time effects from the data. We find a nonlinear relationship between the Hbeta emission line and continuum fluxes that is in good agreement with theoretical predictions. We suggest that similar analysis of multiple lines might provide a useful diagnostic of physical conditions in the broad-line region.

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收藏

页码：123 / 127

页数：5

相关论文

共 12 条

[1] Linear regression for astronomical data with measurement errors and intrinsic scatter [J].

Akritas, MG ;

Bershady, MA .

ASTROPHYSICAL JOURNAL, 1996, 470 (02) :706-714

[2] LUMINOSITY INDICATORS IN SPECTRA OF QUASI-STELLAR OBJECTS [J].

BALDWIN, JA .

ASTROPHYSICAL JOURNAL, 1977, 214 (03) :679-684

[3] REVERBERATION MAPPING OF THE EMISSION-LINE REGIONS OF SEYFERT-GALAXIES AND QUASARS [J].

BLANDFORD, RD ;

MCKEE, CF .

ASTROPHYSICAL JOURNAL, 1982, 255 (02) :419-439

[4] Continuum and emission-line strength relations for a large active galactic nuclei sample [J].

Dietrich, M ;

Hamann, F ;

Shields, JC ;

Constantin, A ;

Vestergaard, M ;

Chaffee, F ;

Foltz, CB ;

Junkkarinen, VT .

ASTROPHYSICAL JOURNAL, 2002, 581 (02) :912-924

[5] A STUDY OF THE BALDWIN EFFECT IN THE IUE DATA SET [J].

KINNEY, AL ;

RIVOLO, AR ;

KORATKAR, AP .

ASTROPHYSICAL JOURNAL, 1990, 357 (02) :338-345

[6] An atlas of computed equivalent widths of quasar broad emission lines [J].

Korista, K ;

Baldwin, J ;

Ferland, G ;

Verner, D .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1997, 108 (02) :401-415

[7] The variable diffuse continuum emission of broad-line clouds [J].

Korista, KT ;

Goad, MR .

ASTROPHYSICAL JOURNAL, 2001, 553 (02) :695-708

[8] LUMINOSITY EFFECTS AND THE EMISSION-LINE PROPERTIES OF QUASARS WITH 0-LESS-THAN-Z-LESS-THAN-3.8 [J].

OSMER, PS ;

PORTER, AC ;

GREEN, RF .

ASTROPHYSICAL JOURNAL, 1994, 436 (02) :678-695

[9] Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. XVI. A 13 year study of spectral variability in NGC 5548 [J].

Peterson, BM ;

Berlind, P ;

Bertram, R ;

Bischoff, K ;

Bochkarev, NG ;

Borisov, N ;

Burenkov, AN ;

Calkins, M ;

Carrasco, L ;

Chavushyan, VH ;

Chornock, R ;

Dietrich, M ;

Doroshenko, VT ;

Ezhkova, OV ;

Filippenko, AV ;

Gilbert, AM ;

Huchra, JP ;

Kollatschny, W ;

Leonard, DC ;

Li, W ;

Lyuty, VM ;

Malkov, YF ;

Matheson, T ;

Merkulova, NI ;

Mikhailov, VP ;

Modjaz, M ;

Onken, CA ;

Pogge, RW ;

Pronik, VI ;

Qian, B ;

Romano, P ;

Sergeev, SG ;

Sergeeva, EA ;

Shapovalova, AI ;

Spiridonova, OI ;

Tao, J ;

Tokarz, S ;

Valdes, JR ;

Vlasiuk, VV ;

Wagner, RM ;

Wilkes, BJ .

ASTROPHYSICAL JOURNAL, 2002, 581 (01) :197-204

[10] THE INTRINSIC NATURE OF THE BALDWIN EFFECT [J].

POGGE, RW ;

PETERSON, BM .

ASTRONOMICAL JOURNAL, 1992, 103 (04) :1084-1088