Access to Astronomical Catalogues

J/AJ/133/965        B light curve of 1WGA J0447.9-0322       (Nesci+, 2007)
Optical variability of the strong-lined and X-ray-bright source
1WGA J0447.9-0322.
    Nesci R., Mandalari M., Gaudenzi S.
   <Astron. J., 133, 965-970 (2007)>
   =2007AJ....133..965N
ADC_Keywords: QSOs ; Photometry

Keywords: galaxies: active - quasars: general -
          quasars: individual (1WGA J0447.9-0322)

Abstract:
    We present the historic light curve of 1WGA J0447.9-0322, spanning the
    time interval from 1962 to 1991, built using the Asiago archive
    plates. The source shows small fluctuations of about 0.3mag around
    B=16 until 1986 and a fast dimming of its average level by about
    0.5mag after that date, again with small short-term variations. The
    variability pattern is within the values shown by other QSOs with
    long-term monitoring, notwithstanding its high X-ray/optical ratio. We
    also present its overall spectral energy distribution using literature
    data and recent UV-optical Swift observations.

Description:
    We found 266 useful plates in the Asiago Observatory archive
    containing our source; 205 of them were obtained with the 50/40/120cm
    Schmidt telescope (S40) and 61 with the 92/67/245cm telescope (S67).
    Several filter-emulsion combinations were used over the years,
    characterized by different effective wavelengths: 103a-O+GG13 (closely
    matching the Johnson's B filter), 103a-O (3600-5000Å), TriX
    (3600-6700Å), and Panchro Royal (3800-6400Å). All these plates
    were taken as part of the supernova sky patrol of the Asiago
    Observatory (mu Eri field) and were never used before for the study of
    1WGA J0447.9-0322. The covered time interval is from 1962 September to
    1991 January but with a highly uneven sampling.
Objects:
    -----------------------------------------------------------
       RA   (2000)   DE    Designation(s)
    -----------------------------------------------------------
    04 47 54.8  -03 22 43  1WGA J0447.9-0322 = PMN J0447-0322
    -----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        31      269   The B magnitudes of 1WGA J0447.9-0322


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label   Explanations

   1-  9  A9    ---     ID      Observation Identification (1)
  11- 20  F10.2 d       JD      Julian Day of the observation
  22- 25  F4.2  mag     e_Bmag  1σ error of the calibration curve in Bmag
  27- 31  F5.2  mag     Bmag    B band magnitude

Note (1): Data from the Asiago plate archive, from STScI plate archive,
          SWIFT/UVOT and the 1.82m Cima Ekar (Asiago) telescope.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    09-Jan-2009