Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution

Man, Zhongyi; Zhang, Xiaoyuan; Wu, Jerry J.; Yuan, Qirong

doi:10.1093/mnras/stv2879

Cited by 18 publications

(18 citation statements)

References 61 publications

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“…Wu et al (2007) found that the source showed two strong flares, with variation amplitudes of about 0.8 and 0.6 mag in the V band, respectively; strong BWB correlations were found for both internight and intranight variations; no apparent time lag was observed between the V and R band variations, and the observed BWB chromatism may be mainly attributed to the larger variation amplitude at shorter wavelength. Man et al (2016) found that variations in the R and B bands were approximately 1.5 min lagging behind the I band for the object. But from results of Carini et al (2011), there are no significant lags between the B and I-band flux variations.…”

Section: Introductionmentioning

confidence: 88%

“…Because of its high power and lack of signs for ongoing accretion or surrounding gas, the source is an ideal candidate to explore the multi-wavelength non thermal emission. The flux and spectral variations of S5 0716+714 have been extensively studied over the entire electromagnetic spectrum (Wagner & Witzel 1995;Wagner et al 1996;Heidt & Wagner 1996;Ghisellini et al 1997;Sagar et al 1999;Qian et al 2002;Raiteri et al 2003;Wu et al 2005Wu et al , 2007Nesci et al 2005;Gu et al 2006;Montagni et al 2006;Ostorero et al 2006;Foschini et al 2006;Zhang et al 2008b;Villata et al 2000Villata et al , 2008Gupta et al 2008bGupta et al , 2009Gupta et al , 2012Vittorini et al 2009;Stalin et al 2006Stalin et al , 2009Anderhub et al 2009;Carini et al 2011;Zhang et al 2012;Hu et al 2014;Dai et al 2013;Larionov et al 2013;Liao et al 2014;Rani et al 2010Rani et al , 2014Chandra et al 2011Chandra et al , 2015Dai et al 2015;Bhatta et al 2015Bhatta et al , 2016Wierzcholska & Siejkowski 2015Man et al 2016;Ag...…”

Section: Introductionmentioning

confidence: 99%

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Multicolor Optical Monitoring of the BL Lacertae Object S5 0716+714 during the 2012 Outburst

Hong

Xiong

Bai

2017

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We have monitored the BL Lacertae object S5 0716+714 in the optical bands during 2012 January and February with long time spans on intraday timescales (>5 hr) and high time resolutions. During this monitoring period, the object shows violent flaring activity both in short and intraday timescales. The object has high value of duty cycle. The light curves detected as intraday variability (IDV) show variability of various shapes. The variability amplitude is from 12.81 per cent to 33.22 per cent, and the average value 19.92 ± 5.87 per cent. The overall magnitude variabilities are △B = 1 m .24, △V = 1 m .42, △R = 1 m .3, △I = 1 m .23 respectively. During the observations, the average change rate is < CR >= 0.035 ± 0.009 Mag/h during the ascent and < CR >= 0.035 ± 0.014 Mag/h during the descent. However, different cases are found on certain nights. There are good inter-bands correlations but not significant time lags for intraday and short timescales. The results of the autocorrelation function show that the variability timescales range from 0.054 day to 0.134 day. Most of nights show bluer when brighter (BWB) chromatic trend; a weak redder with brighter (RWB) trend is found; a few nights show no correlations between magnitude and color index. The BWB trend appears in the short timescales. During the flare the spectral index exhibits a clockwise loop for inter-nights. A shock-in-jet model and the shock wave propagating along a helical path are likely to explain the variability and color index variability.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Multicolor Optical Monitoring of the BL Lacertae Object S5 0716+714 during the 2012 Outburst

Hong

Xiong

Bai

2017

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“…It shows optical variabilities in the whole electromagnetic band with timescales from minutes to years. Intra-day variabilities (IDVs) have been studied by many authors (Poon et al 2009;Liu et al 2012;Gupta et al 2012;Bhatta et al 2013;Man et al 2016;Lee et al 2016, etc.). Gupta et al (2009) obtained timescales of 25 min; Rani et al (2010) obtained timescales of 15 min; Man et al (2016) obtained timescales of 17.6 min; and Bhatta et al (2016) displayed the variability based on the A&A 605, A43 (2017) peak-to-peak variations of 30% and "bluer-when-brighter" spectral evolution.…”

Section: Introductionmentioning

confidence: 99%

“…For this particular BL Lac object, many works have studied the time delays among different optical bands (Poon et al 2009;Zhang 2010;Wu et al 2012;Man et al 2016). For example, Poon et al (2009) found that the time delay between B and I band was τ BI = 11 min; Zhang (2010) obtained time-delay values of a few minutes at different optical bands; Wu et al (2012) got a time delay of 30 min between B and V bands and Man et al (2016) obtained values of 1.308 ± 0.603 min between R and I bands and 1.445 ± 0.511 min between B and I bands.…”

Section: Introductionmentioning

confidence: 99%

Optical monitoring of BL Lac object S5 0716+714 and FSRQ 3C 273 from 2000 to 2014

Yuan

Fan

Tao

et al. 2017

A&A

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Context. Using the 1.56 m telescope at the Shanghai Observatory (ShAO), China, we monitored two sources, BL Lac object S5 0716+714 and flat spectrum radio quasar (FSRQ) 3C 273. For S5 0716+714, we report 4969 sets of CCD (Charge-coupled Device) photometrical optical observations (1369 for V band, 1861 for R band and 1739 for I band) in the monitoring time from Results. The two sources both show IDV properties for S5 0716+714. The timescales are in the range from 17.3 min to 4.82 h; for 3C 273, the timescale is ∆T = 35.6 min. Based on the periodic analysis methods, we find the periods P V = 24.24 ± 1.09 days, P R = 24.12 ± 0.76 days, P I = 24.82 ± 0.73 days for S5 0716+714, and P = 12.99 ± 0.72, 21.76 ± 1.45 yr for 3C 273. The two sources displayed the "bluer-when-brighter" spectral evolution properties. Conclusions. S5 0716+714 and 3C 273 are frequently studied objects. The violent optical variability and IDV may come from the jet. Gaussian fitting can be used to analyze IDVs. The relations between brightness (flux density) and spectrum are strongly influenced by the frequency.

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“…This object is a TeV γ-ray blazar and displays optical short-term variability and micro variability (Hu et al 2014;Man et al 2016). In the radio band, it shows a two-sided halo on the kpc scale, and a one-sided VLBI core jet to the north with highly relativistic speeds (Rani et al 2015;Lister et al 2016).…”

Section: Comments On Individual Sourcesmentioning

confidence: 99%

Radio and optical intra-day variability observations of five blazars

Liu

Yang

Liu

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations of five blazars (3C66A, S5 0716+714, OJ287, B0925+504, and BL Lacertae) on December 18-21, 2015 by using the radio telescope in Effelsberg (Germany) and several optical telescopes in Asia, Europe, and America. After calibration, the light curves from both 5 GHz radio band and the optical R band were obtained, although the data were not smoothly sampled over the sampling period of about four days. We tentatively analyse the amplitudes and time scales of the variabilities, and any possible periodicity. The blazars vary significantly in the radio (except 3C66A and BL Lacertae with only marginal variations) and optical bands on intra-and inter-day time scales, and the source B0925+504 exhibits a strong quasi-periodic radio variability. No significant correlation between the radio-and optical-band variability appears in the five sources, which we attribute to the radio IDV being dominated by interstellar scintillation whereas the optical variability comes from the source itself. However, the radio-and optical-band variations appear to be weakly correlated in some sources and should be investigated based on well-sampled data from future observations.

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Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution

Cited by 18 publications

References 61 publications

Multicolor Optical Monitoring of the BL Lacertae Object S5 0716+714 during the 2012 Outburst

Multicolor Optical Monitoring of the BL Lacertae Object S5 0716+714 during the 2012 Outburst

Optical monitoring of BL Lac object S5 0716+714 and FSRQ 3C 273 from 2000 to 2014

Radio and optical intra-day variability observations of five blazars

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