Extreme photopolarimetric behaviour of the blazar AO 0235+164

Cellone, S. A.; Romero, Gustavo E.; Combi, J. A.; Martı́, Josep

doi:10.1111/j.1745-3933.2007.00366.x

Cited by 26 publications

(19 citation statements)

References 26 publications

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“…But it should be noted that these blazars not always shows the correlation between total flux and PD in the micro variability. In addition, simultaneous short-term photopolarimetric observations have been performed in several blazars (Andruchow et al 2003;Cellone et al 2007;Andruchow et al 2011), and only a few blazar show the correlation between the total flux and PD. In some blazars, the multi-zone model which have several emission regions are applied to explain these randomly correlations between the total flux and PD in micro variability (e.g., Uemura et al 2010;Rafle et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Minute-Scale Rapid Variability of the Optical Polarization in the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022

Itoh

Tanaka

Fukazawa

et al. 2013

ApJ

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We report on optical photopolarimetric results of the radio-loud narrow line Seyfert 1 (RL-NLSy1) galaxy PMN J0948+0022 on 2012 December to 2013 February triggered by flux enhancements in near infrared and γ-ray bands.Thanks to one-shot polarimetry of the HOWPol installed to the Kanata telescope, we have detected very rapid variability in the polarized-flux light curve on MJD 56281 (2012 December 20). The rise and decay times were about 140 sec and 180 sec, respectively. The polarization degree (PD) reached 36 ± 3% at the peak of the short-duration pulse, while polarization angle (PA) remained almost constant. In addition, temporal profiles of the total flux and PD showed highly variable but well correlated behavior and discrete correlation function analysis revealed that no significant time lag of more than 10 min was present. The high PD and minute-scale variability in polarized flux provides a clear evidence of synchrotron radiation from a very compact emission region of ∼ 10 14 cm size with highly ordered magnetic field. Such micro variability of polarization are also observed in several blazar jets, but its complex relation between total flux and PD are explained by multi-zone model in several blazars. The implied single emission region in PMN J0948+0022 might be reflecting a difference of jets between RL-NLSy1s and blazars.

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Section: Discussionmentioning

confidence: 99%

Minute-Scale Rapid Variability of the Optical Polarization in the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022

Itoh

Tanaka

Fukazawa

et al. 2013

ApJ

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“…Therefore, optical polarimetric observations also provide a strong tool to probe jet structures (e.g., Marscher et al 2008;Abdo et al 2010a). Nevertheless, simultaneous short-term (intra-day) observations of flux, color and polarization have been performed only in a few blazars (e.g., Andruchow et al 2003;Cellone et al 2007;Sasada et al 2008;Hagen-Thorn et al 2008;Andruchow et al 2011), and hence the origin of micro variability is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Dense Optical and Near-Infrared Monitoring of Cta 102 During High State in 2012 With Oister: Detection of Intra-Night “Orphan Polarized Flux Flare”

Itoh

Fukazawa

Tanaka

et al. 2013

ApJ

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CTA 102, classified as a flat spectrum radio quasar at z=1.037, produced exceptionally bright optical flare in 2012 September. Following Fermi-LAT detection of enhanced γ-ray activity, we densely monitored this source in the optical and near-infrared bands for the subsequent ten nights using twelve telescopes in Japan and South-Africa. On MJD 56197 (2012 September 27, 4-5 days after the peak of bright γ-ray flare), polarized flux showed a transient increase, while total flux and polarization angle remained almost constant during the "orphan polarized-flux flare". We also detected an intra-night and prominent flare on MJD 56202. The total and polarized fluxes showed quite similar temporal variations, but PA again remained constant during the flare. Interestingly, the polarization angles during the two flares were significantly different from the jet direction.Emergence of a new emission component with high polarization degree (PD) up to 40% would be responsible for the observed two flares, and such a high PD indicates a presence of highly ordered magnetic field at the emission site. We discuss that the well-ordered magnetic field and even the observed directions of polarization angle which is grossly perpendicular to the jet are reasonably accounted for by transverse shock(s) propagating down the jet.

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“…A mask with alternating blind and clear stripes is placed before the detector to avoid image overlapping. Four frames, each with a different position of the half-wave plate (0, 22.5, 45, and 67.5 deg) are needed to obtain the normalised Stokes parameters (U, Q) for linear polarization (for more details, see Cellone et al 2007b, and references therein).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Polarization and photometric observations of the gamma-ray blazar PG 1553+113

Andruchow

Combi

Muñoz‐Arjonilla

et al. 2011

A&A

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We present the results of an observational photo-polarimetry campaign of the blazar PG 1553+113 at optical wavelengths. The blazar was recently detected at very high energies (>100 GeV) by the HESS and MAGIC γ-ray Cherenkov telescopes. Our high-temporal resolution data show significant variations in the linear polarization percentage and position angle at inter-night time-scales, while at shorter (intra-night) time-scales both parameters varied less significantly, if at all. Changes in the polarization angle seem to be common in γ-ray emitting blazars. Simultaneous differential photometry (through the B and R bands) shows no significant variability in the total optical flux. We provide B and R magnitudes, along with a finding chart, for a set of field stars suitable for differential photometry.

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Extreme photopolarimetric behaviour of the blazar AO 0235+164

Cited by 26 publications

References 26 publications

Minute-Scale Rapid Variability of the Optical Polarization in the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022

Minute-Scale Rapid Variability of the Optical Polarization in the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022

Dense Optical and Near-Infrared Monitoring of Cta 102 During High State in 2012 With Oister: Detection of Intra-Night “Orphan Polarized Flux Flare”

Polarization and photometric observations of the gamma-ray blazar PG 1553+113

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