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J/A+A/531/A123    Optical light curve of PKS 2155-304      (Kastendieck+, 2011)

Long-term optical variability of PKS 2155-304. Kastendieck M.A., Ashley M.C.B., Horns D. <Astron. Astrophys. 531, A123 (2011)> =2011A&A...531A.123K
ADC_Keywords: BL Lac objects ; Photometry Keywords: BL Lacertae objects: individual: PKS 2155-304 - methods: statistical - galaxies: photometry - accretion, accretion disks - galaxies: jets - black hole physics Abstract: The long-term optical light curve of PKS 2155-304 is assembled from archival data as well as from so-far unpublished observations mostly carried out with the ROTSE-III and the ASAS robotic telescopes. A forward folding technique is used to determine the best-fit parameters for a model of a power law with a break in the power spectral density function (PSD). The best-fit parameters are estimated using a maximum-likelihood method with simulated light curves in conjunction with the Lomb-Scargle periodogram and the first-order structure function (SF). In addition, a new approach based upon the so-called multiple fragments variance function (MFVF) is introduced and compared to the other methods. Simulated light curves have been used to confirm the reliability of these methods as well as to estimate the uncertainties of the best-fit parameters. Description: Optical light curve (R-band) of PKS 2155-304 measured with ROTSE. The light curve was observed from August 24th, 2003 till October 26th, 2010 with the ROTSE-III telescope system. ROTSE (2003PASP..115..132A) does not use an R-Band filter. The R-band magnitudes are rather cross calibrated with the magnitudes of hundreds of reference stars. Since the optical spectrum of PKS 2155-304 deviates from a star-like spectrum the measured luminosity deviates systematically. A cross calibration with the ATOM telescope (2004AN....325..659H) revealed that the ROTSE magnitude can be adjusted by subtracting 0.22 from the measured values: mR=mROTSE-0.22. Objects: -------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------- 21 58 52.1 -30 13 32 PKS 2155-304 = QSO B2155-304 -------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file phot.dat 30 6310 Optical light curve (R-band) of PKS 2155-304
See also: IX/19 : X-ray lightcurves of bright AGNs from Ginga (Hayashida+ 1998) J/A+A/469/503 : VRIJHK observations of PKS 2155-304 (Dolcini+, 2007) Byte-by-byte Description of file: phot.dat
Bytes Format Units Label Explanations
1- 14 F14.6 d JD Julian Date 17- 22 F6.3 --- Rmag Apparent R-band magnitude (1) 25- 30 F6.4 --- e_Rmag 1 σ statistical uncertainty of Rmag
Note (1): Rmag deviates systematically with ~+0.22 (see descr. above)
Acknowledgements: Max A. Kastendieck, max.kastendieck(at) References: Akerlof, C. W. et al. 2003, (2003PASP..115..132A) The ROTSE-III Robotic Telescope System Hauser, M. et al. 2004, (2004AN....325..659H) ATOM - an Automatic Telescope for Optical Monitoring
(End) M. Kastendieck [Univ. of Hamburg, Germany], P. Vannier [CDS] 01-Jul-2011
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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