J/ApJS/213/26 Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
Optical monitoring of two brightest nearby quasars, PHL 1811 and 3C 273.
Fan J.H., Kurtanidze O., Liu Y., Richter G.M., Chanishvili R., Yuan Y.H.
<Astrophys. J. Suppl. Ser., 213, 26 (2014)>
=2014ApJS..213...26F 2014ApJS..213...26F
ADC_Keywords: Active gal. nuclei ; Photometry, UBVRI ; QSOs
Keywords: galaxies: active; galaxies: photometry;
quasars: individual (PHL 1811, 3C273)
Abstract:
Variability is one of the most observable characteristics of active
galactic nuclei, and it is important when considering the emission
mechanism. In this paper, we report optical photometry monitoring of
two nearby brightest quasars, PHL 1811 and 3C 273, using the ST-6
camera attached to the Newtonian focus and the Ap6E CCD camera
attached to the primary focus of the 70cm meniscus telescope at the
Abastumani Observatory, Georgia. PHL 1811 was monitored during the
period from 2002 September to 2012 December, while 3C 273 was
monitored during the period from 1998 February to 2008 May. During our
monitoring period, the two sources did not show any significant
intra-day variability. The largest detected variations are
ΔR=0.112±0.010mag. for PHL 1811, ΔB=0.595±0.099mag,
ΔV=0.369±0.028mag, ΔR=0.495±0.076mag, and
ΔI=0.355±0.009mag for 3C 273. When the periodicity analysis
methods are adopted for the observations of the sources, a period of
p=5.80±1.12yr is obtained for PHL 1811 in the R light curve in the
present work, and periods of p=21.10±0.14, 10.00±0.14,
7.30±0.09, 13.20±0.09, 2.10±0.06, and 0.68±0.05yr are obtained
for 3C 273 based on the data in the present work combined with
historical works.
Description:
PHL 1811 and 3C 273 are targets in the monitoring programs carried out
at the Abastumani Observatory, Mt. Kanobili, Georgia. PHL 1811 has
been monitored since 2002, while 3C 273 has been observed since 1998
February. All of our observations were made using the filters combined
from the glasses. Those filters are matched with the standard B, V
(Johnson), Rc, and Ic (Cousins) passbands. The seeing during our
observations varied in the range of 0.8-3.0 arcsec.
For PHL 1811, optical R data observed from 2002 September to 2012
December. For 3C 273, the optical BVRI observations were carried out
from 1998 February to 2008.
Objects:
-------------------------------------------------------
RA (ICRS) DE Designation(s)
-------------------------------------------------------
21 55 01.52 -09 22 24.7 PHL 1811 = QSO J2155-0922
12 29 06.70 +02 03 08.7 3C273 = QSO J1229+0203
-------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 25 311 Observational data (R) for PHL 1811
table3.dat 107 1109 Observational data (BVRI) for 3C273
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)
J/ApJ/730/19 : IR spectra and SEDs for starbursts and AGNs (Sargsyan+, 2011)
J/ApJS/193/28 : Galaxy survey around 20 UV-bright quasars (Prochaska+, 2011)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)
J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)
J/MNRAS/392/1181 : BV(RI)c photometry of 3C 273 (Dai+, 2009)
J/ApJ/679/194 : Low-z intergalactic medium. III. (Danforth+, 2008)
J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)
J/A+A/436/799 : X- & gamma-ray fluxes of γ-ray-loud blazars (Fan+, 2005)
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date of observation
15- 19 F5.3 mag Rmag [0.96/1.08] Differential R band magnitude (1)
21- 25 F5.3 mag e_Rmag [0.001/0.04] The 1σ uncertainty in Rmag
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Note (1): For PHL 1811, the optical R data observed from 2002 September to
2012 December were obtained using the comparison stars X, Y, and Z
shown in Figure 1.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD.B ? Julian Date of B band observation
15- 20 F6.3 mag Bmag [12.7/13.3]? The B band magnitude
22- 26 F5.3 mag e_Bmag [0/0.1]? The 1σ uncertainty in Bmag
28- 40 F13.5 d JD.V ? Julian Date of V band observation
42- 47 F6.3 mag Vmag [12.5/13]? The V band magnitude
49- 53 F5.3 mag e_Vmag [0/0.09]? The 1σ uncertainty in Vmag
55- 67 F13.5 d JD.R Julian Date of Rc band observation
69- 74 F6.3 mag Rcmag [12.2/12.8] The Rc band magnitude
76- 80 F5.3 mag e_Rcmag [0/0.07] The 1σ uncertainty in Rcmag
82- 94 F13.5 d JD.I ? Julian Date of Ic band observation
96-101 F6.3 mag Icmag [11.8/12.2]? The Ic band magnitude
103-107 F5.3 mag e_Icmag [0.001/0.06]? The 1σ uncertainty in Icmag
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Sep-2014