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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 (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: ------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------ 14 17 59 +25 08 12 NGC 5548 = UGC 9149 ------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 36 304 Optical continuum and Hβ light curves
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
Bytes Format Units Label Explanations
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)
History: From ApJ electronic edition References: Paper XIV Collier+ 1998 (1998ApJ...500..162C) Paper XIII O'Brien+ 1998 (1998ApJ...509..163O) Paper XII Dietrich+ 1998 (1998ApJS..115..185D) Paper XI Wanders+ 1997 (1997ApJS..113...69W) Paper X Santos-Lleo+ 1997 (1997ApJS..112..271S) Paper IX Rodriguez-Pascual+ 1997 (1997ApJS..110....9R) Paper VIII Korista+ 1995 (1995ApJS...97..285K) Paper VII Peterson+ 1994 (1994ApJ...425..622P) Paper VI Stirpe+ 1994 (1994ApJ...425..609S) Paper V Reichert+ 1994 (1994ApJ...425..582R) Paper IV Dietrich+ 1993 (1993ApJ...408..416D) Paper III Peterson+ 1992 (1992ApJ...392..470P) Paper II Peterson+ 1991 (1991ApJ...368..119P) Paper I Clavel+ 1991 (1991ApJ...366...64C)
(End) Greg Schwarz (AAS) 08-Feb-2000
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