J/ApJ/783/83 BVRI photometry of S5 0716+714 (Liao+, 2014)
Multiwavelength variability properties of Fermi blazar S5 0716+714.
Liao N.H., Bai J.M., Liu H.T., Weng S.S., Chen L., Li F.
<Astrophys. J., 783, 83 (2014)>
=2014ApJ...783...83L 2014ApJ...783...83L (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Photometry, UBVRI
Keywords: BL Lacertae objects: individual - galaxies: active - galaxies: jets -
radiation mechanisms: non-thermal
Abstract:
S5 0716+714 is a typical BL Lacertae object. In this paper we present
the analysis and results of long-term simultaneous observations in the
radio, near-infrared, optical, X-ray, and γ-ray bands, together
with our own photometric observations for this source. The light
curves show that the variability amplitudes in γ-ray and optical
bands are larger than those in the hard X-ray and radio bands and that
the spectral energy distribution (SED) peaks move to shorter
wavelengths when the source becomes brighter, which is similar to
other blazars, i.e., more variable at wavelengths shorter than the SED
peak frequencies. Analysis shows that the characteristic variability
timescales in the 14.5GHz, the optical, the X-ray, and the γ-ray
bands are comparable to each other. The variations of the hard X-ray
and 14.5GHz emissions are correlated with zero lag, and so are the V
band and γ-ray variations, which are consistent with the
leptonic models. Coincidences of γ-ray and optical flares with a
dramatic change of the optical polarization are detected. Hadronic
models do not have the same natural explanation for these observations
as the leptonic models. A strong optical flare correlating a
γ-ray flare whose peak flux is lower than the average flux is
detected. The leptonic model can explain this variability phenomenon
through simultaneous SED modeling. Different leptonic models are
distinguished by average SED modeling. The synchrotron plus
synchrotron self-Compton (SSC) model is ruled out because of the
extreme input parameters. Scattering of external seed photons, such as
the hot-dust or broad-line region emission, and the SSC process are
probably both needed to explain the γ-ray emission of S5
0716+714.
Description:
The variability of S5 0716+714 was photometrically monitored in the
optical bands at Yunnan Observatories, making use of the 2.4m
telescope (http://www.gmg.org.cn/) and the 1.02m telescope
(http://www1.ynao.ac.cn/~omt/). The 2.4m telescope, which began
working in 2008 May, is located at the Lijiang Observatory of Yunnan
Observatories, where the longitude is 100°01'51''E and the
latitude is 26°42'32''N, with an altitude of 3193m. There are two
photometric terminals. The PI VersArry 1300B CCD camera with 1340*1300
pixels covers a field of view 4'48''*4'40'' at the Cassegrain focus.
The readout noise and gain are 6.05 electrons and 1.1 electrons
ADU-1, respectively. The Yunnan Faint Object Spectrograph and Camera
(YFOSC) has a field of view of about 10'*10' and 2000*2000 pixels for
photometric observation. Each pixel corresponds to 0.283'' of the sky.
The readout noise and gain of the YFOSC CCD are 7.5 electrons and 0.33
electrons ADU-1, respectively. The 1.02m telescope is located at the
headquarters of Yunnan Observatories and is mainly used for photometry
with standard Johnson UBV and Cousins RI filters. An Andor CCD camera
with 2048*2048 pixels has been installed at its Cassegrain focus since
2008 May. The readout noise and gain are 7.8 electrons and 1.1
electrons ADU-1, respectively.
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 = IRAS F07162+7126
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 22 115 Multiband photometric data from Yunnan observatories
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See also:
J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)
J/A+A/558/A92 : S5 0716+714 microvariability observation (Bhatta+, 2013)
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
J/AJ/143/108 : B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)
J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJ/715/429 : First Fermi-LAT AGN catalog (1LAC) (Abdo+, 2010)
J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)
J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009)
J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)
J/AJ/136/1846 : BVRI light curves of S5 0716+714 (Zhang+, 2008)
J/AJ/133/1599 : B'V'R' photometry of S5 0716+714 (Wu+, 2007)
J/AZh/83/310 : BV(RI)c photometry of S5 0716+714 (Amirkhanyan+, 2006)
J/A+A/451/435 : BV(RI)c photometry of S5 0716+714 (Montagni+, 2006)
J/AJ/129/1818 : Photometry of S5 0716+714 (Wu+, 2005)
J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)
J/A+AS/136/455 : BVRI photometry of 3 BL Lac objects (Bai+, 1999)
J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)
J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.1 d MJD Modified Julian date of the observation
9- 14 F6.3 mag [12.3/14.7] Nightly averaged magnitude in Flt (1)
16- 20 F5.3 mag e_ [0.002/0.05] Uncertainty in
22 A1 --- Flt [BVRI] Filter used in the observation (B, V, R, I)
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Note (1): The correction for the interstellar extinction has been already
completed.
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 15-Apr-2016