J/ApJ/880/155 RI photometry of blazars S5 0716+714 and 3C 273 (Liu+, 2019)
Search for intra-day optical variability in γ-ray-loud blazars S5 0716+714
and 3C 273.
Liu H.T., Feng H.C., Xin Y.X., Bai J.M., Li S.K., Wang F.
<Astrophys. J., 880, 155 (2019)>
=2019ApJ...880..155L 2019ApJ...880..155L
ADC_Keywords: BL Lac objects; Photometry, RI
Keywords: BL Lacertae objects: general ;
BL Lacertae objects: individual (S5 0716+714) ;
galaxies: active ; quasars: general ; quasars: individual (3C 273)
Abstract:
We present the photometric observations of blazars S5 0716+714 and
3C 273 with high temporal resolution (30-60s) in the I or R bands.
The observations were performed with a 1.02m optical telescope from
2007 March 7 to 2012 May 16. The F-test, one-way analysis of variance
(ANOVA) test, and z-transformed discrete correlation function (ZDCF)
cross-correlation zero lag test are used to search for intra-day
variability (IDV). Four and five reliable IDVs survive three tests for
S5 0716+714 and 3C 273, respectively. IDVs are found for S5 0716+714
and 3C 273. A flare on 2008 May 8 has ΔI∼0.06±0.01mag in a
duration of 0.54hr for S5 0716+714. A flare on 2011 May 10 shows
ΔR∼0.05±0.01mag in a duration of 0.40hr for 3C 273. Sharp dips
appear on 2011 May 9 for 3C 273 and show ΔR∼0.05±0.01mag.
Under the assumptions that the IDV is tightly connected to black hole
mass, M*, and that the flare durations are representative of the
minimum characteristic timescales, we can estimate upper bounds to M*.
In the case of the Kerr black holes, M*≲108.91M☉ and
M*≲109.02M☉ are given for S5 0716+714 and 3C 273,
respectively. These mass measurements are consistent with those
measurements reported in the literature. Also, we discuss the origins
of optical variations found in this work.
Description:
The photometric observations of S5 0716+714 and 3C 273 were performed
with the 1.02m optical telescope at Yunnan Observatories of Chinese
Academy of Sciences from 2007 March 7 to 2012 May 16.
In six nights, 648 I-band CCD images of S5 0716+714 were obtained. For
3C 273, we observed 14 nights and obtained 2305 CCD frames (611 in the
I band and 1694 in the R band).
Objects:
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RA (ICRS) DE Designation(s)
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07 21 53.45 +71 20 36.4 S5 0716+714 = PKS 0716+714
12 29 06.70 +02 03 08.6 3C 273 = PKS 1226+023
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 1694 Observational data for blazars
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See also:
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
J/ApJ/613/682 : AGN masses & broad-line region sizes (Peterson+, 2004)
J/MNRAS/392/1181 : BV(RI)c photometry of 3C 273 (Dai+, 2009)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)
J/ApJS/192/12 : Photometry of the blazar PKS 0537-441 (Impiombato+, 2011)
J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
J/ApJ/783/83 : BVRI photometry of S5 0716+714 (Liao+, 2014)
J/ApJS/218/18 : 2004-2012 BVRI obs. of blazar S5 0716+714 (Dai+, 2015)
J/MNRAS/448/1060 : Fermi/LAT broad emission line blazars (Ghisellini+, 2015)
J/ApJ/849/161 : BVRI light curves of the BL Lac object Mrk 501 (Feng+, 2017)
J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 2017)
J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)
J/ApJ/876/49 : 10yr reverberation mapping campaign for 3C273 (Zhang+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 d S5-JD [166.9/595.11]? Julian Date
of S5 0716+714 observation; JD-2454000
12- 17 F6.3 mag S5-Imag [12/12.81]? Apparent I band magnitude
of S5 0716+714
19- 23 F5.3 mag e_S5-Imag [0.004/0.02]? Uncertainty in S5-Imag
25- 30 F6.3 mag S5-Std [-0.009/0.009]? Mean value of I band stdij
of comparison stars of S5 0716+714 (1)
32- 41 F10.6 d 3C-I-JD [168.27/967.86]? Julian Date
of 3C 273 I band observation; JD-2454000
43- 48 F6.3 mag 3C-Imag [11.72/12.26]? Apparent I band magnitude
of 3C 273
50- 54 F5.3 mag e_3C-Imag [0.004/0.04]? Uncertainty in 3C-Imag
56- 61 F6.3 mag 3C-I-Std [-0.008/0.009]? Mean value of I band stdij
of comparison stars of 3C 273 (1)
63- 73 F11.6 d 3C-R-JD [1331.73/2063.87] Julian Date
of 3C 273 I band observation; JD-2454000
75- 80 F6.3 mag 3C-Rmag [12.5/12.7] Apparent R band magnitude of 3C 273
82- 86 F5.3 mag e_3C-Rmag [0.003/0.03] Uncertainty in 3C-Rmag
88- 93 F6.3 mag 3C-R-Std [-0.01/0.01] Mean value of R band stdij
of comparison stars of 3C 273 (1)
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Note (1): During our observations, several comparison stars are always located
in the target FOV. For the most observable night (except S5 0716+714
on 2008 May 8), we can choose the same four comparison stars to
calibrate the relevant target and characterize the uncertainties in
the observations. Star2, star5, and star6 are always located in the
FOV of 0716+714 on 2008 May 8 and are used in data reduction. Figure 1
shows the comparison stars star2, star3, star5, and star6 for S5
0716+714, and starC, starE, starG, and star1 for 3C 273.
See Section 2 for further explanations.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Jan-2021