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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 (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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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