Access to Astronomical Catalogues

J/ApJ/622/129       Lag-luminosity relationship in AGN          (Sergeev+, 2005)
Lag-luminosity relationship for interband lags between variations in B, V, R,
and I bands in active galactic nuclei.
    Sergeev S.G., Doroshenko V.T., Golubinskiy Y.V., Merkulova N.I.,
    Sergeeva E.A.
   <Astrophys. J., 622, 129-135 (2005)>
   =2005ApJ...622..129S
ADC_Keywords: Active gal. nuclei ; Photometry, UBVRI

Keywords: galaxies: active - galaxies: nuclei - galaxies: photometry -
          galaxies: Seyfert

Abstract:
    We determine interband lags between variations in the B band and
    variations in the V, R, and I bands for 14 active galactic nuclei
    observed at the Crimean Astrophysical Observatory. The computed lags
    range from tenths of a day to several days, and it is positive (that
    is, V, R, and I bands lag behind the B band) in most cases, except for
    a few cases for the V filter.

Description:
    At the end of 2001 we started an intensive monitoring of active
    galaxies at the 70cm telescope of the Crimean Astrophysical
    Observatory.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        59       14   Nuclei variability characteristics for the B filter
table1.dat        44     6913   Light curves


See also:
  IX/19 : X-ray lightcurves of bright AGNs from Ginga (Hayashida+ 1998)
  J/PAZh/21/652  : Optical variability in NGC 7469 (Lyuty+, 1995)
  J/A+A/314/43   : NGC 5548 Profile variability (Kollatschny+ 1996)
  J/A+A/320/405  : NGC 5548 continuum light curve (Sergeev+ 1997)
  J/PAZh/23/409  : Spectrophotometry of Mrk 509 (Chuvaev+, 1997)
  J/ApJS/115/185 : 3C 390.3 BVRI and H photometry (Dietrich+, 1998)
  J/PAZh/25/403  : Optical variability of NGC 4151 (Lyuty+, 1999)
  J/A+A/376/775  : UBVRI and H-beta observations of 3C 390.3 (Shapovalova+ 2001)
  J/A+A/371/79   : NGC 5548 UBVRI phot. and Halpha, Hbeta fluxes (Dietrich+, 
                   2001)
  J/A+A/422/925  : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)
  J/A+A/437/87   : Mrk 335 photometry in 1995-2004 (Doroshenko+, 2005)
  J/A+A/486/99   : Long-term spectral variability of NGC 4151 (Shapovalova+, 
                   2008)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 14  A14   ---     Name      Object name
  16- 22  F7.5  ---     z         Redshift
  24- 32  A9    d       ObsDate   Period of observations (JD-2450000)
  34- 36  I3    ---     Nobs      Number of nights of observations
      38  I1    d       dt        Median time interval between successive
                                  observations
  40- 43  F4.1  %       rms       rms variability amplitude
  45- 48  F4.2  ---     Rmax      Ratio of maximum to minimum fluxes
  50- 52  I3    d       ACF       ? Width of the autocorrelation function
                                  (ACF) at half-maximum (1)
  54- 59  F6.2  ---     BMAG      Absolute B magnitude (2)

Note (1): For two objects, the width of the ACF is undefined because of a
          systematic increase (3C 390.3) or decrease (Mrk 335) in brightness
          during the monitoring period.
Note (2): Absolute B magnitude computed by assuming a value of the Hubble
          constant of 75km/s/Mpc.


Byte-by-byte Description of file: table1.dat

   Bytes Format Units     Label   Explanations

   1- 14  A14   ---       Name    Object name
  16- 17  A2    ---       Filter  Filter that Flux was observed in (1)
  19- 30  F12.4 d         HJD     Heliocentric Julian Date
  32- 37  F6.4  ---       Flux    Relative flux (2)
  39- 44  F6.4  ---       e_Flux  The 1σ uncertainty in Flux

Note (1): R1 represents closely Cousins filter I, while filters designated
          as B, V, R, and I represent closely the standard Johnson filters.
Note (2): Object brightness with respect to a comparison star (linear scale,
          not magnitudes).


History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    02-May-2006