CROSS-CORRELATION METHODOLOGY IN VARIABILITY STUDIES OF ACTIVE GALACTIC NUCLEI - COMMENT

被引：316

作者：

WHITE, RJ ^{[1
]}

PETERSON, BM ^{[1
]}

机构：

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

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC | 1994年 / 106卷 / 702期

关键词：

D O I：

10.1086/133456

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss two separate cross-correlation methodologies, the interpolation method of Gaskell and Sparke and the discrete correlation function of Edelson and Krolik, that are commonly used to quantify the lags between continuum and emission-line flux variations in active galactic nuclei (AGNs). We show that if similar assumptions are made to normalize the cross-correlation functions, the two methods are in good agreement for well-sampled AGN light curves. We also investigate the performance of cross-correlation methodology for less well-sampled data sets through Monte Carlo simulations that employ realistic models of the continuum behavior (based on well-observed Seyfert galaxies) and typical emission-line response times. We find that the interpolation method fairly accurately recovers the emission-line lags as the sampling is degraded (i.e., as the number of observed points is reduced). We find that for the cases investigated, the emission-line lags can be determined with reasonable accuracy even with mean sampling intervals as large as around two weeks.

引用

页码：879 / 889

页数：11

共 21 条

[11] THE RESPONSE OF THE BROAD EMISSION-LINE REGION TO IONIZING CONTINUUM VARIATIONS .2. NUMERICAL SIMULATIONS [J].

PEREZ, E ;

ROBINSON, A ;

DELAFUENTE, L .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1992, 255 (03) :502-520

[12] 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 [J].

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 ;

FRICKE, KJ ;

GASKELL, CM ;

HALPERN, JP ;

HUCHRA, JP ;

HUTCHINGS, JB ;

KOLLATSCHNY, W ;

KORATKAR, AP ;

KORISTA, KT ;

KROLIK, JH ;

LAME, NJ ;

LAOR, A ;

LEACOCK, RJ ;

MACALPINE, GM ;

MALKAN, MA ;

MAOZ, D ;

MILLER, HR ;

MORRIS, SL ;

NETZER, H ;

OLIVEIRA, CLM ;

PENFOLD, J ;

PENSTON, MV ;

PEREZ, E ;

POGGE, RW ;

RICHMOND, MW ;

ROMANISHIN, W ;

ROSENBLATT, EI ;

SADDLEMYER, L ;

SADUN, A ;

SAWYER, SR ;

SHIELDS, JC .

ASTROPHYSICAL JOURNAL, 1991, 368 (01) :119-137

[13] REVERBERATION MAPPING OF ACTIVE GALACTIC NUCLEI [J].

PETERSON, BM .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1993, 105 (685) :247-268

[14] EMISSION-LINE VARIABILITY IN SEYFERT-GALAXIES [J].

PETERSON, BM .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1988, 100 (623) :18-36

[15] STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .3. FURTHER OBSERVATIONS OF NGC-5548 AT OPTICAL WAVELENGTHS [J].

PETERSON, BM ;

ALLOIN, D ;

AXON, D ;

BALONEK, TJ ;

BERTRAM, R ;

BOROSON, TA ;

CHRISTENSEN, JA ;

CLEMENTS, SD ;

DIETRICH, M ;

ELVIS, M ;

FILIPPENKO, AV ;

GASKELL, CM ;

HASWELL, CA ;

HUCHRA, JP ;

JACKSON, N ;

KOLLATSCHNY, W ;

KORISTA, KT ;

LAME, NJ ;

LEACOCK, RJ ;

LIN, SN ;

MALKAN, MA ;

MONK, AS ;

PENSTON, MV ;

POGGE, RW ;

ROBINSON, A ;

ROSENBLATT, EI ;

SHIELDS, JC ;

SMITH, AG ;

STIRPE, GM ;

SUN, WH ;

TURNER, TJ ;

WAGNER, RM ;

WILKES, BJ ;

WILLS, BJ .

ASTROPHYSICAL JOURNAL, 1992, 392 (02) :470-484

[16]

PRESS WH, 1989, NUMERICAL RECIPES AR, P484

[17] STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .5. VARIABILITY OF THE ULTRAVIOLET CONTINUUM AND EMISSION-LINES OF NGC-3783 [J].

REICHERT, GA ;

RODRIGUEZPASCUAL, PM ;

ALLOIN, D ;

CLAVEL, J ;

CRENSHAW, DM ;

KRISS, GA ;

KROLIK, JH ;

MALKAN, MA ;

NETZER, H ;

PETERSON, BM ;

WAMSTEKER, W ;

ALTAMORE, A ;

ALTIERI, B ;

ANDERSON, KS ;

BLACKWELL, JH ;

BOISSON, C ;

BROSCH, N ;

CARONE, TE ;

DIETRICH, M ;

ENGLAND, MN ;

EVANS, IN ;

FILIPPENKO, AV ;

GASKELL, CM ;

GOAD, M ;

GONDHALEKAR, PM ;

HORNE, K ;

KAZANAS, D ;

KOLLATSCHNY, W ;

KORATKAR, AP ;

KORISTA, KT ;

MACALPINE, GM ;

MAOZ, D ;

MAZEH, T ;

MCCOLLUM, B ;

MILLER, HR ;

DEOLIVEIRA, CM ;

OBRIEN, PT ;

PASTORIZA, MG ;

PELAT, D ;

PEREZ, E ;

PEROLA, GC ;

POGGE, RW ;

PTAK, RL ;

RECONDOGONZALEZ, MC ;

RODRIGUEZESPINOSA, J ;

ROSENBLATT, EI ;

SADUN, AC ;

SANTOSLLEO, M ;

SHIELDS, JC ;

SHRADER, CR .

ASTROPHYSICAL JOURNAL, 1994, 425 (02) :582-608

[18]

ROBINSON A, 1990, MON NOT R ASTRON SOC, V244, P138

[19]

RODRIGUEZPASCUAL PM, 1989, ASTRON ASTROPHYS, V219, P101

[20] STEPS TOWARD DETERMINATION OF THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI .6. VARIABILITY OF NGC-3783 FROM GROUND-BASED DATA [J].

STIRPE, GM ;

WINGE, C ;

ALTIERI, B ;

ALLOIN, D ;

AGUERO, EL ;

ANUPAMA, GC ;

ASHLEY, R ;

BERTRAM, R ;

CALDERON, JH ;

CATCHPOLE, RM ;

CORRADI, RLM ;

COVINO, E ;

DOTTORI, HA ;

FEAST, MW ;

GHOSH, KK ;

HUTTON, RG ;

GLASS, IS ;

GREBEL, EK ;

JORDA, L ;

KOEN, C ;

LANEY, CD ;

MAIA, M ;

MARANG, F ;

MAYYA, YD ;

MORRELL, N ;

NAKADA, Y ;

PASTORIZA, MG ;

PATI, AK ;

PELAT, D ;

PETERSON, BM ;

PRABHU, TP ;

ROBERTS, G ;

SAGAR, R ;

SALAMANCA, I ;

SEKIGUCHI, K ;

STORCHIBERGMANN, T ;

SUBRAMANIAM, A ;

VANWINCKEL, H ;

VANWYK, F ;

VILLADA, M ;

WAGNER, RM ;

WHITELOCK, PA ;

WINKLER, H ;

CLAVEL, J ;

DIETRICH, M ;

KOLLATSCHNY, W ;

OBRIEN, PT ;

PEROLA, GC ;

RECONDOGONZALEZ, MC ;

RODRIGUEZPASCUAL, P .

ASTROPHYSICAL JOURNAL, 1994, 425 (02) :609-621

← 1 2 3 →