J/ApJ/902/42 Spectroscopic monitoring of blazar S5 0716+714 (Feng+, 2020)
Spectroscopic monitoring of blazar S5 0716+714: brightness-dependent spectral
behavior.
Feng H.-C., Yang S., Yang Z.-X., Liu H.T., Bai J.M., Li S.-S., Zhao X.H.,
Zhang J., Li Y.B., Xiao M., Xin Y.X., Xing L.F., Lu K.X., Xu L., Wang J.G.,
Wang C.J., Zhang X.L., Zhang J.J., Lun B.L., He S.S.
<Astrophys. J., 902, 42 (2020)>
=2020ApJ...902...42F 2020ApJ...902...42F
ADC_Keywords: BL Lac objects; Spectra, optical; Active gal. nuclei
Keywords: Active galactic nuclei ; BL Lacertae objects ; Blazars ;
Relativistic jets ; Spectroscopy
Abstract:
In this paper, we report new results of spectroscopic observations of
γ-ray blazar S5 0716+714 from 2019 September to 2020 March with
the 2.4m optical telescope at Lijiang Observatory of Yunnan
Observatories. The median cadence of observations is ∼1 day. During
the second observation period (Epoch2), the observational data reveal
an extremely bright state and a bluer-when-brighter (BWB) chromatism.
The BWB trend of Epoch2 differs significantly from that of the first
observation period (Epoch1). A significantly brightness-dependent BWB
chromatism emerges in the total data of Epoch1 and Epoch2. The BWB
trend becomes weaker toward the brighter states, and likely becomes
saturated at the highest state. Based on a log-parabolic function, a
power law of synchrotron peak flux and frequency νp, and a power
law of the curvature of synchrotron spectrum and its νp, simulation
well reproduces the brightness-dependent BWB trend of S5 0716+714. The
BWB trend is seemingly controlled by the shift of νp with respect
to the observational window, and effectively may be dominated by the
variations of electron average energy and magnetic field in the
emitting region.
Description:
The spectroscopic observations of S5 0716+714 are almost the same as
those described in Feng+ 2020, J/ApJ/888/30, except for minor
differences in flux calibration.
All the data were taken by the Yunnan Faint Object Spectrograph and
Camera, mounted at the Cassegrain focus in 2.4m optical telescope at
Lijiang Observatory (Yunnan Observatories, Chinese Academy of Science)
from 2019 September to 2020 March. The monitoring campaign spanned 166
days, and 106 spectra were obtained over 102 nights.
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 = 8C 0716+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 86 106 Spectral flux in each bin for Epoch 2
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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/AZh/83/310 : BV(RI)c photometry of S5 0716+714 (Amirkhanyan+, 2006)
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/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/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)
J/AJ/143/108 : B'V'R' phot. of the BL Lac object S5 0716+714 (Wu+, 2012)
J/A+A/558/A92 : S5 0716+714 microvariability observation (Bhatta+, 2013)
J/ApJ/768/40 : R-band and polarimetry of S5 0716+71 (Larionov+, 2013)
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/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)
J/PAZh/43/407 : S5 0716+714 polarization & brightness (Doroshenko+ 2017)
J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 2017)
J/A+A/601/A12 : S5 0716+714 VLBI K- and Q-band variability (Lee+, 2017)
J/A+A/619/A45 : S5 0716+714 multi-wavelength curves (MAGIC Col.+, 2018)
J/ApJS/235/39 : Jet properties of γ-ray-loud 3FGL AGNs (Chen, 2018)
J/AJ/155/31 : 2005-2012 BVRI obs. of blazar S5 0716+714 (Hong+, 2018)
J/ApJ/880/155 : RI photometry of blazars S5 0716+714 and 3C 273 (Liu+, 2019)
J/ApJ/884/92 : 7yrs of VRI obs. of S5 0716+714 and its flares (Xu+, 2019)
J/ApJ/888/30 : BVRI and spectroscopic LCs of S5 0716+714 (Feng+, 2020)
J/ApJ/893/68 : RadioAstron. III. S5 0716+71 (Kravchenko+, 2020)
J/ApJS/247/49 : gri obs. of 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- 14 F14.6 d JD Julian Date
16- 20 F5.3 10-14cW/m2/nm Flux4425 [1/5.8] Flux, bin 1 (4425Å),
10-14erg/s/cm2/Angstrom (1)
22- 26 F5.3 10-14cW/m2/nm e_Flux4425 [0.02/0.16] Uncertainty in Flux4425
28- 32 F5.3 10-14cW/m2/nm Flux5125 [0.97/4.9] Flux, bin 2 (5125Å),
10-14erg/s/cm2/Angstrom (1)
34- 38 F5.3 10-14cW/m2/nm e_Flux5125 [0.015/0.09] Uncertainty in Flux5125
40- 44 F5.3 10-14cW/m2/nm Flux5825 [0.89/4.32] Flux, bin 3 (5825Å),
10-14erg/s/cm2/Angstrom (1)
46- 50 F5.3 10-14cW/m2/nm e_Flux5825 [0.013/0.11] Uncertainty in Flux5825
52- 56 F5.3 10-14cW/m2/nm Flux6525 [0.8/3.82] Flux, bin 4 (6525Å),
10-14erg/s/cm2/Angstrom (1)
58- 62 F5.3 10-14cW/m2/nm e_Flux6525 [0.012/0.1] Uncertainty in Flux6525
64- 68 F5.3 10-14cW/m2/nm Flux7225 [0.79/3.56] Flux, bin 5 (7225Å),
10-14erg/s/cm2/Angstrom (1)
70- 74 F5.3 10-14cW/m2/nm e_Flux7225 [0.013/0.1] Uncertainty in Flux7225
76- 80 F5.3 10-14cW/m2/nm Flux7925 [0.7/3.2] Flux, bin 6 (7925Å),
10-14erg/s/cm2/Angstrom (1)
82- 86 F5.3 10-14cW/m2/nm e_Flux7925 [0.011/0.09] Uncertainty in Flux7925
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Note (1): The six spectral bins are 50 Angstroms wide and centered at 4425,
5125, 5825, 6525, 7225, and 7925 Angstroms, respectively.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jan-2022