Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7022
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dc.contributor.authorRakshit, S-
dc.contributor.authorStalin, C. S-
dc.contributor.authorMuneer, S-
dc.contributor.authorNeha, S-
dc.contributor.authorPaliya, Vaidehi S-
dc.date.accessioned2020-11-17T02:26:50Z-
dc.date.available2020-11-17T02:26:50Z-
dc.date.issued2017-02-01-
dc.identifier.citationThe Astrophysical Journal, Vol. 835, No. 2, 275en_US
dc.identifier.issn0004-637X-
dc.identifier.urihttp://prints.iiap.res.in/handle/2248/7022-
dc.descriptionRestricted Access © The American Astronomical Society https://doi.org/10.3847/1538-4357/835/2/275en_US
dc.description.abstractThe gamma-ray blazar OJ 287 was in a high activity state during 2015 December–2016 February. Coinciding with this high brightness state, we observed this source for photometry on 40 nights in R-band and for polarimetry on nine epochs in UBV RI bands. During the period of our observations, the source brightness varied from 13.20 ± 0.04 mag to 14.98 ± 0.04 mag and the degree of polarization (P) fluctuated between 6.0% ± 0.3% and 28.3% ± 0.8% in R-band. Focusing on intranight optical variability (INOV), we find a duty cycle of about 71% using χ2-statistics, similar to that known for blazars. From INOV data, the shortest variability timescale is estimated to be 142 ± 38 minutes, yielding a lower limit of the observed Doppler factor δ0 = 1.17, the magnetic field strength B ≤ 3.8 G, and the size of the emitting region Rs < 2.28 × 1014 cm. On internight timescales, a significant anticorrelation between R-band flux and P is found. The observed P at U-band is generally larger than that observed at longer-wavelength bands, suggesting a wavelength-dependent polarization. Using V-band photometric and polarimetric data from Steward Observatory obtained during our monitoring period, we find a varied correlation between P and V-band brightness. While an anticorrelation is sometimes seen between P and V-band magnitude, no correlation is seen at other times, thereby suggesting the presence of more than one short-lived shock component in the jet of OJ 287.en_US
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.subjectBL Lacertae objects: individual ( OJ 287 )en_US
dc.subjectGalaxies: photometryen_US
dc.subjectPolarizationen_US
dc.titleFlux and polarization variability of OJ 287 during the early 2016 outbursten_US
dc.typeArticleen_US
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