J/ApJ/510/659 Size and Structure of AGN in NGC 5548 (Peterson+, 1999)
Steps toward Determination of the Size and Structure of the Broad-Line
Region in Active Galactic Nuclei. XV. Long-Term Optical Monitoring of NGC 5548
Peterson B. M., Barth A. J., Berlind P., Bertram R., Bischoff K.,
Bochkarev N. G., Burenkov A. N., Cheng F.-Z., Dietrich M.,
Pilippenko A. V., Giannuzzo E., Ho L. C., Huchra J. P., Hunley J.,
Kaspi S., Kollatschny W., Leonard D. C., Malkov Y. F., Matheson T.,
Mignoli M., Nelson B., Papaderos P., Peters J., Pogge R. W.,
Pronik V. I., Sergeev S. G., Sergeeva E. A., Shapovalova A. I.,
Stirpe G. M., Tokarz S., Wagner R. M., Wanders I., Wei J.-Y.,
Wilkes B. J., Wu H., Xue S.-J., Zou Z.-L.
<Astrophys. J. 510, 659 (1999)>
=1999ApJ...510..659P 1999ApJ...510..659P (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei; Galaxies, optical; Galaxies, Seyfert;
Photometry
Keywords: galaxies: active - galaxies: individual (NGC 5548) -
galaxies: nuclei - galaxies: Seyfert
Abstract:
We present the results of 3 yr of ground-based observations of the
Seyfert 1 galaxy NGC 5548, which, combined with previously reported
data, yield optical continuum and broad-line Hβ light curves for
a total of 8 yr. The light curves consist of over 800 points, with a
typical spacing of a few days between observations. During this 8 yr
period, the nuclear continuum has varied by more than a factor of 7,
and the Hβ emission line has varied by a factor of nearly 6. The
Hβ emission line responds to continuum variations with a time
delay or lag of ≃10--20 days, the precise value varying somewhat
from year to year. We find some indications that the lag varies with
continuum flux in the sense that the lag is larger when the source is
brighter.
Objects:
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RA (2000) DE Designation(s)
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14 17 59 +25 08 12 NGC 5548 = UGC 9149
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 36 304 Optical continuum and Hβ light curves
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See also:
J/ApJS/115/185 : 3C 390.3 BVRI and H photometry (Dietrich+, 1998)
J/A+A/371/79 : NGC 5548 UBVRI phot., Halpha & Hbeta fluxes (Dietrich+, 2001)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 F9.1 d JD Julian Date (-2440000.0)
12- 16 F5.2 10-14mW/m2/nm F5100 Flux at 5100Å
(10^-15 erg/cm^2/s/Å)
19- 22 F4.2 10-14mW/m2/nm e_F5100 uncertainty of F5100
(10^-15 erg/cm^2/s/Å)
25- 29 F5.2 10-12mW/m2/nm FHbeta Flux at Hβ
(10^-13 erg/cm^2/s/Å)
33- 36 F4.2 10-12mW/m2/nm e_FHbeta uncertainty of FHbeta
(10^-13 erg/cm^2/s/Å)
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History:
From ApJ electronic edition
References:
Paper XIV Collier+ 1998 (1998ApJ...500..162C 1998ApJ...500..162C)
Paper XIII O'Brien+ 1998 (1998ApJ...509..163O 1998ApJ...509..163O)
Paper XII Dietrich+ 1998 (1998ApJS..115..185D 1998ApJS..115..185D)
Paper XI Wanders+ 1997 (1997ApJS..113...69W 1997ApJS..113...69W)
Paper X Santos-Lleo+ 1997 (1997ApJS..112..271S 1997ApJS..112..271S)
Paper IX Rodriguez-Pascual+ 1997 (1997ApJS..110....9R 1997ApJS..110....9R)
Paper VIII Korista+ 1995 (1995ApJS...97..285K 1995ApJS...97..285K)
Paper VII Peterson+ 1994 (1994ApJ...425..622P 1994ApJ...425..622P)
Paper VI Stirpe+ 1994 (1994ApJ...425..609S 1994ApJ...425..609S)
Paper V Reichert+ 1994 (1994ApJ...425..582R 1994ApJ...425..582R)
Paper IV Dietrich+ 1993 (1993ApJ...408..416D 1993ApJ...408..416D)
Paper III Peterson+ 1992 (1992ApJ...392..470P 1992ApJ...392..470P)
Paper II Peterson+ 1991 (1991ApJ...368..119P 1991ApJ...368..119P)
Paper I Clavel+ 1991 (1991ApJ...366...64C 1991ApJ...366...64C)
(End) Greg Schwarz (AAS) 08-Feb-2000