J/ApJS/229/21 VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)
Multicolor optical monitoring of the quasar 3C 273 from 2005 to 2016.
Xiong D., Bai J., Zhang H., Fan J., Gu M., Yi T., Zhang X.
<Astrophys. J. Suppl. Ser., 229, 21-21 (2017)>
=2017ApJS..229...21X 2017ApJS..229...21X (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Photometry, VRI
Keywords: galaxies: active; galaxies: photometry;
quasars: individual: 3C 273
Abstract:
We have monitored the quasar 3C 273 in the optical V, R, and I bands
from 2005 to 2016. Intraday variability (IDV) is detected on seven
nights. The variability amplitudes on most of the nights are less than
10%, and on four nights, more than 20%. When considering the nights
with time spans >4hr, the duty cycle (DC) is 14.17%. Over the 12yrs,
the overall magnitude and color index variabilities are ΔI=0.67,
ΔR=0.72, ΔV=0.68, and Δ(V-R)=0.25, respectively. The
largest clear IDV has an amplitude of 42% over just 5.8 minutes, and
the weakest detected IDV is 5.4% over 175 minutes. The BWB (bluer when
brighter) chromatic trend is dominant for 3C 273 and appears at
different flux levels on intraday timescales. The BWB trend exists for
short-term timescales and intermediate-term timescales but different
timescales have different correlations. There is no BWB trend for our
whole time-series data sets. A significant anticorrelation between the
BWB trend and length of timescales is found. Combining with V-band
data from previous works, we find a possible quasi-periodicity of
P=3918±1112 days. The possible explanations for the observed
variability, BWB chromatic trend, and periodicity are discussed.
Description:
Our optical monitoring program of 3C 273 was carried out using the
2.4m and 1.02m optical telescopes located at the Yunnan Astronomical
Observatories (YAO) of China. Our photometry observations were
performed in the V, R, and I bands during 105 nights between 2005
April 05 and 2016 May 27.
Objects:
-----------------------------------------------------
RA (ICRS) DE Designation(s)
-----------------------------------------------------
12 29 06.70 +02 03 08.7 3C 273 = QSO J1229+0203
-----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 34 1901 Data of I Band
table3.dat 34 1707 Data of R Band
table4.dat 34 1544 Data of V Band
--------------------------------------------------------------------------------
See also:
J/A+A/601/A35 : High-fidelity VLA imaging of 3C273 (Perley+, 2017)
J/A+A/576/A122 : 3C 273 high energy spectrum (Esposito+, 2015)
J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
J/MNRAS/435/1300 : Intranight optical variability of AGN (Goyal+, 2013)
J/MNRAS/392/1181 : BV(RI)c photometry of 3C 273 (Dai+, 2009)
J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)
http://isdc.unige.ch/3c273/ : 3C 273's database
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y/M/D" Date UT date of the observation
13- 21 F9.3 d MJD Modified Julian Date of observation
23- 28 F6.3 mag Imag [11.9/12.6] Apparent I band magnitude
30- 34 F5.3 mag e_Imag [0.002/0.06] The rms error in Imag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y/M/D" Date UT date of the observation
13- 21 F9.3 d MJD Modified Julian Date of observation
23- 28 F6.3 mag Rmag [12.3/13.1] Apparent R band magnitude
30- 34 F5.3 mag e_Rmag [0.001/0.06] The rms error in Rmag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y/M/D" Date UT date of the observation
13- 21 F9.3 d MJD Modified Julian Date of observation
23- 28 F6.3 mag Vmag [12.4/13.1] Apparent V band magnitude
30- 34 F5.3 mag e_Vmag [0.001/0.05] The rms error in Vmag
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-Jun-2017