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J/A+A/371/79     NGC 5548 UBVRI phot. and Halpha, Hbeta fluxes (Dietrich+, 2001)

A spectroscopic and photometric study of short-timescale variability in NGC 5548 Dietrich M., Bender C.F., Bergmann D.J., Bills T.E., Bochkarev N.G., Burenkov A.N., Gaskell C.M., Gutzmer D.D., Grove R., Hiller M.E., Huchra J.P., Klimek E.S., Lund C., Merkulova N.I., Pebley S., Poulsen M.A., Pronik V.I., Sergeev S.G., Sergeev E.A., Shapovalova A.I., Vlasyuk V.V., Wilkes B. <Astron. Astrophys. 371, 79 (2001)> =2001A&A...371...79D
ADC_Keywords: Galaxies, Seyfert ; Photometry, UBVRI ; Spectroscopy Keywords: galaxies: active - galaxies: Seyfert galaxies - galaxies: individual (NGC 5548) Abstract: Results of a ground-based optical monitoring campaign on NGC 5548 in June 1998 are presented. The broad-band fluxes (U, B, V), and the spectrophotometric optical continuum flux Fλ (5100Å) monotonically decreased in flux while the broad-band R and I fluxes and the integrated emission-line fluxes of Hα and Hβ remained constant to within 5%. On June 22, a short continuum flare was detected in the broad band fluxes. It had an amplitude of about ∼18% and it lasted only ≃90 min. The broad band fluxes and the optical continuum Fλ (5100Å) appear to vary simultaneously with the EUV variations. No reliable delay was detected for the broad optical emission lines in response to the EUVE variations. Narrow Hβ emission features predicted as a signature of an accretion disk were not detected during this campaign. However, there is marginal evidence for a faint feature at λ≃4962Å with FWHM≃6Å redshifted by Δv≃1100km/s with respect to Hβnarrow. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 14 17 59.7 +25 08 13 NGC 5548 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a.dat 81 178 log of the photometric observations. The flux of the broad band fluxes is given in units of [10-15erg/s/cm2^/Å] table2a.dat 83 84 log of the spectroscopic observations table3a.dat 58 56 Emission line and continuum flux measurements.
See also: J/ApJ/510/659 : Size and Structure of AGN in NGC 5548 (Peterson+, 1999) Byte-by-byte Description of file: table1a.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Date Observation date 12- 23 F12.4 d HJD Heliocentric Julian date of observation 25 A1 --- Code [DQ] Code (G1) 27- 31 F5.2 10-17W/m2/nm Umag ? U magnitude 33- 36 F4.2 10-17W/m2/nm e_Umag ? rms uncertainty on Umag 38- 42 F5.2 10-17W/m2/nm Bmag ? B magnitude 44- 47 F4.2 10-17W/m2/nm e_Bmag ? rms uncertainty on Bmag 49- 53 F5.2 10-17W/m2/nm Vmag V magnitude 55- 58 F4.2 10-17W/m2/nm e_Vmag rms uncertainty on Vmag 60- 64 F5.2 10-17W/m2/nm Rmag ? R magnitude 66- 69 F4.2 10-17W/m2/nm e_Rmag ? rms uncertainty on Rmag 71- 75 F5.2 10-17W/m2/nm Imag ? I magnitude 77- 80 F4.2 10-17W/m2/nm e_Imag ? rms uncertainty on Imag
Byte-by-byte Description of file: table2a.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Date Observation date 12- 24 F13.5 d Middle Julian date of middle of observation 26- 27 A2 --- Code Code (G1) 29- 32 I4 s Tint Integration time 34- 37 I4 0.1nm linf Lower limit of spectroscopic range 38 A1 --- --- [-] 39- 42 I4 0.1nm lsup Upper limit of spectroscopic range 44- 47 F4.2 arcsec Aper1 Aperture 49 A1 --- --- [x] 51- 55 F5.2 arcsec Aper2 Aperture 57- 59 I3 deg PA Position angle 62- 64 F3.1 arcsec Seeing Seeing 66- 69 F4.2 0.1nm Res ? Resolution 70 A1 --- --- [-] 71 I1 0.1nm Res2 ? Upper limit of resolution when interval 74- 83 A10 --- Filename Filename of the observation
Byte-by-byte Description of file: table3a.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Date Observation date 12- 22 F11.3 d HJD Heliocentric Julian date of observation 24- 25 A2 --- Code Code (G1) 27- 31 F5.2 10-17W/m2/nm Fl5100 ? Continuum flux (1) 33- 36 F4.2 10-17W/m2/nm e_Fl5100 ? rms uncertainty on Fl5100 (1) 38- 42 F5.2 10-16W/m2 FHbeta ? Hβ emission line flux (2) 44- 47 F4.2 10-16W/m2 e_FHbeta ? rms uncertainty on FHbeta (2) 49- 53 F5.2 10-16W/m2 FHalpha ? Hα emission line flux (2) 55- 58 F4.2 10-16W/m2 e_FHalpha ? rms uncertainty on FHalpha (2)
Note (1): Wavelength range 5185Å-5195Å. In units of 10-15erg/s/cm2^/Å Note (2): In units of 10-13erg/s/cm2^
Global notes: Note (G1): Table 1: Overview of observations; the aperture size is given in arcsec ------------------------------------------------------------------------------- Source Code Tel. Photometry Aperture Spectroscopy [m] U B V R I Aperture ------------------------------------------------------------------------------- Mt. Hopkins Observatory C 1.5 --- --- --- --- --- 3x4.6 Crimean Astrophysical Obs. D 1.25 15 15 15 15 15 --- Calar Alto Observatory G 2.2 --- --- --- --- --- 2.06x2.61 Special Astrophysical Obs. L1 1.0 --- --- --- --- --- 8x6.6,8x19.8 Special Astrophysical Obs. L2 6.0 --- --- --- --- --- 2x6 Univ. of Nebraska 0.4m Q 0.4 --- --- 8 --- --- --- Shajn reflector, Crimean Obs. W 2.6 --- --- --- --- --- 3x11 -------------------------------------------------------------------------------
Acknowledgements: Matthias Dietrich
(End) Patricia Bauer [CDS] 09-Mar-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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