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Optical-IUE observations of the gamma-ray loud BL Lacertae object S5 0716+714: data and interpretation

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arxiv astro-ph/9706254 v1 pith:HWTCA6WE submitted 1997-06-25 astro-ph

classification astro-ph
keywords duringegretgamma-rayspectrumbrightdatadeclinefast
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We monitored the BL Lac object S5 0716+714 in the optical band during the period November 1994-April 1995, which includes the time of a gamma-ray observation by the Energetic Gamma Ray Experiment Telescope (EGRET) on February 14--28, 1995. The light curves in the R and B bands show fast fluctuations superimposed on longer timescale variations. The color index correlates with intensity during the rapid flares (the spectrum is flatter when the flux is higher), but it is rather insensitive to the long term trends. Over the 5 month observational period the light curve shows an overall brightening of about 1 mag followed by a fast decline. The EGRET pointing covers part of the very bright phase (V about 13.2) and the initial decline. An ultraviolet spectrum was also obtained with the International Ultraviolet Explorer (IUE) (1200-3000 A) during the EGRET observations. The variability of the optical emission of S5 0716+714 by itself sets important constraints on the magnetic field strength and on the physical processes responsible for it. Interpreting the whole electromagnetic spectrum with synchrotron self Compton models leads to the prediction of a bright gamma-ray state during the EGRET pointing. We discuss how the gamma-ray data could be used as a diagnostic of the proposed models.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Multi-wavelength variability analysis of the blazar S5 0716+714 during a long-lasting period of low activity

    astro-ph.HE 2025-07 conditional novelty 5.0 of 10

    A six-month multi-wavelength campaign on blazar S5 0716+714 during a low-activity state reveals a transient 43.5-day quasi-periodic oscillation and an unusually low intranight duty cycle.

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    X-ray spectra of Mkn 421 across five AstroSat epochs fit three electron distribution models whose inferred pivot energies do not vary, supporting acceleration-timescale-driven variability.

  3. Multiband Optical Variability of the Blazar 3C 454.3 on Diverse Timescales

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    Twenty years of optical light curves of blazar 3C 454.3 show a redder-when-brighter trend that flattens near I-band magnitude 14.5 and a two-peaked distribution of spectral indices.

  4. Multi-band optical variability of the blazar OP 313 in the outburst state during 2024-2025

    astro-ph.HE 2025-07 conditional novelty 4.0 of 10

    Multi-band optical monitoring of the blazar OP 313 during its 2024-2025 outburst reveals a bluer-when-brighter color trend on short-term timescales, a behavior more typical of BL Lac objects than FSRQs.

  5. Jet Power Estimates of FSRQs PKS 1441+25 and Ton 599 from Broadband SED Modeling

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    Jet power estimates for FSRQs PKS 1441+25 and Ton 599 are insensitive to the choice of electron energy distribution model because of lower break energies and external Compton dominance.

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