J/AJ/139/2425 Historic light curves of 3 known blazars (Nesci, 2010)
GB6 J1058+5628: a new quasi-periodic BL Lac object from the Asiago plate
archive.
Nesci R.
<Astron. J., 139, 2425-2432 (2010)>
=2010AJ....139.2425N 2010AJ....139.2425N
ADC_Keywords: BL Lac objects ; QSOs ; Photometry, photographic
Keywords: BL Lacertae objects: individual
(GB6 J1058+5628, GB6 J1148+5254, GB6 J1209+4119) - galaxies: active
Abstract:
We present the historic photographic light curves of three little
known blazars (two BL Lac objects and one FSRQ), GB6 J1058+5628,
GB6 J1148+5254, and GB6 J1209+4119, spanning a time interval of about
50 years, mostly built using the Asiago plate archive. All objects
show evident long-term variability, over which short-term variations
are superposed. One source, GB6 J1058+5628, showed a marked
quasi-periodic variability of 1mag on timescale of about 6.3 years,
making it one of the few BL Lac objects with a quasi-periodic
behavior.
Description:
Plates were digitized at the Asiago Observatory with an EPSON 1680
Plus scanner, a sampling step of 16um (1600 dpi) in
grayscale/transparency mode and 16 bit resolution. Plate scanning also
included the unexposed borders to measure the plate fog level (F).
Objects:
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RA (2000) DE Designation(s)
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10 58 37.73 +56 28 11.2 GB6J1058+5628 = 2EG J1054+5736
11 48 56.57 +52 54 25.3 GB6J1148+5254 = BWE 1146+5311
12 09 22.79 +41 19 41.4 GB6J1209+4119 = BWE 1206+4136
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 55 251 Historic BJ magnitudes from the Asiago archive
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Source name
15- 25 A11 --- Plate Plate identification
27- 31 A5 --- Filt Filter used
33- 44 F12.4 d JD Julian date of observation
46- 50 F5.2 mag Bmag Observed BJ band magnitude
52- 55 F4.2 mag e_Bmag Error in Bmag
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jun-2012