J/ApJ/884/92 7yrs of VRI obs. of S5 0716+714 and its flares (Xu+, 2019)
Statistical analysis of microvariability properties of the blazar S5 0716+714.
Xu J., Hu S., Webb J.R., Bhatta G., Jiang Y., Chen Xu, Alexeeva S., Li Y.
<Astrophys. J., 884, 92 (2019)>
=2019ApJ...884...92X 2019ApJ...884...92X
ADC_Keywords: BL Lac objects; Photometry, VRI
Keywords: Blazar ; Galactic nuclei ; Photometry ; Relativistic jets ; Shocks
Abstract:
The typical blazar S5 0716+714 is very interesting due to its rapid
and large-amplitude variability and high duty cycle of
microvariability in the optical band. We analyze the observations in
the I, R, and V bands obtained with the 1.0m telescope at Weihai
observatory of Shandong University from 2011 to 2018. The model of
synchrotron radiation from turbulent cells in a jet has been proposed
as a mechanism for explaining microvariability seen in blazar light
curves. Parameters such as the sizes of turbulent cells, the enhanced
particle densities, and the location of the turbulent cells in the jet
can be studied using this model. The model predicts a time lag between
variations, as observed in different frequency bands. An automatic
model fitting method for microvariability is developed, and the
fitting results of our multi-frequency microvariability observations
support the model. The results show that both the amplitude and
duration of flares decomposed from the microvariability light curves
conform to the log-normal distribution. The turbulent cell size is
within the range of about 5-55au, and the time lags of the
microvariability flares between the I-R and R-V bands should be
several minutes. The time lags obtained from the turbulence model are
consistent with the fitting statistical results, and the time lags of
flares are correlated with the time lags of the whole light curve.
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 = QSO B0716+714
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 16786 Photometric results catalog
table2.dat 20 219 The statistical results catalog
table3.dat 53 1031 Flare parameters used to fit the data
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See also:
J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)
J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)
J/AJ/129/1818 : Photometry of S5 0716+714 (Wu+, 2005)
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
J/A+A/451/435 : BV(RI)c photometry of S5 0716+714 (Montagni+, 2006)
J/AZh/83/310 : BV(RI)c photometry of S5 0716+714 (Amirkhanyan+, 2006)
J/AJ/133/1599 : B'V'R' photometry of S5 0716+714 (Wu+, 2007)
J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)
J/AJ/136/1846 : BVRI light curves of S5 0716+714 (Zhang+, 2008)
J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)
J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)
J/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)
J/AJ/143/108 : B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)
J/ApJ/768/40 : R-band and pol. of the blazar S5 0716+71 (Larionov+, 2013)
J/A+A/558/A92 : S5 0716+714 microvariability observation (Bhatta+, 2013)
J/ApJ/783/83 : BVRI photometry of S5 0716+714 (Liao+, 2014)
J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)
J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 2017)
J/PAZh/43/407 : S5 0716+714 pol. & brightness 1991-2004 (Doroshenko+ 2017)
J/A+A/601/A12 : S5 0716+714 VLBI K- and Q-band variability (Lee+, 2017)
J/AJ/155/31 : 2005-2012 BVRI obs. of blazar S5 0716+714 (Hong+, 2018)
J/A+A/619/A45 : S5 0716+714 multi-wavelength LCs (MAGIC Collaboration+, 2018)
J/ApJ/880/155 : RI photometry of blazars S5 0716+714 and 3C 273 (Liu+, 2019)
J/ApJS/247/49 : gri obs. of the blazar S5 0716+714 (2017-2019) (Xiong+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of the observation (UT)
12 A1 --- Band Band used in the observation (V, R or I)
14- 24 F11.3 d JD [2455578.15/2458171.17] Julian date of
observation
26- 30 F5.2 mag mag [11.71/15.65] Apparent magnitude in Band
32- 37 F6.4 mag e_mag [0.001/0.5] Error in mag
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of the observation (UT)
12 A1 --- Band Band used in the observation (V, R or I)
14- 16 I3 --- Np [11/245] Number of data points
18- 20 I3 --- Nfl [1/14] Number of data flares
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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- 10 A10 "date" Date Date of the observation (UT)
12- 18 I7 --- JD [2455578/2458171] Julian Day of
the observation
20 A1 --- Band Band used in the observation (V, R or I)
22- 23 I2 --- Seq [1/14] Single day flare serial number
25- 29 F5.2 h Center [-1.32/10.2] Central moment of flare
31- 34 F4.2 mJy Amp [0/6.73] Flare amplitude
36- 40 F5.2 10-5/s/m3 N10-5 [0/51.61] Turbulent particle number density
42- 45 F4.2 h tflare [0/8.81] Duration of flare
47- 53 F7.3 AU Scell [0/104.4] Turbulent cell size
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Mar-2021