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 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:
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RA (2000) DE Designation(s)
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04 47 54.8 -03 22 43 1WGA J0447.9-0322 = PMN J0447-0322
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 31 269 The B magnitudes of 1WGA J0447.9-0322
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Data from the Asiago plate archive, from STScI plate archive,
SWIFT/UVOT and the 1.82m Cima Ekar (Asiago) telescope.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Jan-2009