J/ApJ/888/30 BVRI and spectroscopic light curves of S5 0716+714 (Feng+, 2020)
Quasi-simultaneous spectroscopic and multiband photometric observations of
blazar S5 0716+714 during 2018-2019.
Feng H.-C., Liu H.T., Bai J.M., Xing L.F., Li Y.B., Xiao M., Xin Y.X.
<Astrophys. J., 888, 30-30 (2020)>
=2020ApJ...888...30F 2020ApJ...888...30F (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects; Photometry, UBVRI; Spectra, optical
Keywords: BL Lacertae objects; Active galaxies; Blazars; Galaxy photometry
Spectroscopy
Abstract:
In order to study short timescale optical variability of γ-ray
blazar S5 0716+714, quasi-simultaneous spectroscopic and multiband
photometric observations were performed from 2018 November to 2019
March with the 2.4m optical telescope located at Lijiang Observatory
of Yunnan Observatories. The observed spectra are well fitted with a
power law Fλ=Aλ-α (spectral index α>0).
Correlations found between {dot}α, {dot}A, {dot}A/A,
{dot}Fλ, and {dot}Fλ/Fλ are consistent with
the trend of bluer-when-brighter (BWB). It is the same case for
colors, magnitudes, color variation rates, and magnitude variation
rates of photometric observations. The variations of α lead
those of Fλ. Also, the color variations lead magnitude
variations. The observational data are mostly distributed in the
I(+,+) and III(-,-) quadrants of the coordinate system. Both
spectroscopic and photometric observations show BWB behaviors in
S5 0716+714. The observed BWB may be explained by the shock-jet model,
and its appearance may depend on the relative position of the
observational frequency ranges with respect to the synchrotron peak
frequencies, e.g., at the left of the peak frequencies. Fractional
variability amplitudes are Fvar∼40% for both spectroscopic and
photometric observations. Variations of α indicate variations of
relativistic electron distribution producing the optical spectra.
Description:
All the spectroscopic and photometric observations of S5 0716+714 were
carried out with the 2.4m alt-azimuth telescope, which is located at
Lijiang Observatory of Yunnan Observatories, Chinese Academy of Science.
The monitoring campaign, with the Yunnan Faint Object Spectrograph and
Camera (YFOSC), started in 2018 November and spanned ∼106 days (until
2019 March).
For most clear dark or gray nights, we basically performed photometric
and spectroscopic observations of S5 0716+714 within 10 minutes. Thus,
the photometry and spectroscopy can be considered to be
quasi-simultaneous. During our observations, we successfully obtained
the photometric data in 42 nights and spectral data in 47 nights.
The final spectra (obtained with Grism 3) cover the observed frame of
4250-8050Å. We bin individual spectra to obtain the spectroscopic
LCs, and the bin width is 50Å. See Section 2.2.
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
table2.dat 33 42 Photometric data in the Johnson B band
table3.dat 33 41 Photometric data in the Johnson V band
table4.dat 33 42 Photometric data in the Cousins R band
table5.dat 33 41 Photometric data in the Cousins I band
table6.dat 86 47 Spectral flux in each bin
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See also:
VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)
VIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)
J/A+AS/115/1 : Optical identification of S5 catalog (Stickel+, 1996)
J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
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/MNRAS/401/1240 : Light curves of flat-spectrum radio sources (Jenness+, 2010)
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/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)
J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)
J/A+A/548/A79 : INTEGRAL-OMC opt. variable sources (Alfonso-Garzon+, 2012)
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 polarimetry of S5 0716+71 (Larionov+, 2013)
J/A+A/558/A92 : S5 0716+714 microvariability observation (Bhatta+, 2013)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)
J/ApJ/783/83 : BVRI photometry of S5 0716+714 (Liao+, 2014)
J/MNRAS/448/1060 : Fermi/LAT broad emission line blazars (Ghisellini+, 2015)
J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)
J/ApJ/798/134 : MOJAVE. XII. Acceleration of blazar jets (Homan+, 2015)
J/A+A/587/A112 : Long term R and V band monitoring of AGN (Taris+, 2016)
J/A+A/596/A45 : Radio light curves of 8 AGN (Fuhrmann+, 2016)
J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)
J/AZh/93/605 : AGN long-term variability (Volvach+, 2016)
J/ApJ/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)
J/ApJ/849/161 : BVRI light curves of the BL Lac object Mrk 501 (Feng+, 2017)
J/ApJ/851/33 : Multi-wavelength analysis of CGRaBS blazars (Paliya+, 2017)
J/A+A/601/A12 : S5 0716+714 VLBI K- and Q-band variability (Lee+, 2017)
J/PAZh/43/407 : S5 0716+714 pol. & brightness 1991-2004 (Doroshenko+ 2017)
J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 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 curves (MAGIC Col.+, 2018)
J/A+A/620/A185 : Long-term optical monitoring of TeV Blazars (Nilsson+, 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/ApJS/247/49 : gri obs. of the blazar S5 0716+714 (2017-2019) (Xiong+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date of B band observation
15- 20 F6.3 mag Bmag [14/15.9] B band magnitude of object
22- 26 F5.3 mag e_Bmag [0.001/0.05] Uncertainty in Bmag-o
28- 33 F6.3 mag Bmag-s [13.26/13.32] B band magnitude of comparison star
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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- 13 F13.5 d JD Julian Date of V band observation
15- 20 F6.3 mag Vmag [13.2/15.1] V band magnitude of object
22- 26 F5.3 mag e_Vmag [0.001/0.2] Uncertainty in Vmag-o
28- 33 F6.3 mag Vmag-s [12.42/12.48] V band magnitude of comparison star
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date of R band observation
15- 20 F6.3 mag Rmag [12.8/14.6] R band magnitude of object
22- 26 F5.3 mag e_Rmag [0.002/0.09] Uncertainty in Rmag-o
28- 33 F6.3 mag Rmag-s [12.05/12.15] R band magnitude of comparison star
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date of I band observation
15- 20 F6.3 mag Imag [12.35/13.95] I band magnitude of object
22- 26 F5.3 mag e_Imag [0.001/0.07] Uncertainty in Imag-o
28- 33 F6.3 mag Imag-s [11.76/11.85] I band magnitude of comparison star
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d JD Julian Date of observation
16- 20 F5.3 10-16W/m2/nm Flux-bin1 [0.4/2.3] Spectral Bin # 1
22- 26 F5.3 10-16W/m2/nm e_Flux-bin1 [0.01/0.13] Uncertainty in Flux-bin1
28- 32 F5.3 10-16W/m2/nm Flux-bin2 [0.38/2] Spectral Bin # 2
34- 38 F5.3 10-16W/m2/nm e_Flux-bin2 [0.01/0.11] Uncertainty in Flux-bin2
40- 44 F5.3 10-16W/m2/nm Flux-bin3 [0.3/1.8] Spectral Bin # 3
46- 50 F5.3 10-16W/m2/nm e_Flux-bin3 [0.008/0.11] Uncertainty in Flux-bin3
52- 56 F5.3 10-16W/m2/nm Flux-bin4 [0.35/1.61] Spectral Bin # 4
58- 62 F5.3 10-16W/m2/nm e_Flux-bin4 [0.007/0.11] Uncertainty in Flux-bin4
64- 68 F5.3 10-16W/m2/nm Flux-bin5 [0.37/1.53] Spectral Bin # 5
70- 74 F5.3 10-16W/m2/nm e_Flux-bin5 [0.01/0.11] Uncertainty in Flux-bin5
76- 80 F5.3 10-16W/m2/nm Flux-bin6 [0.36/1.4] Spectral Bin # 6
82- 86 F5.3 10-16W/m2/nm e_Flux-bin6 [0.008/0.17] Uncertainty in Flux-bin6
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Jun-2021