Precursor Flares in Oj 287

Pihajoki, Pauli; Valtonen, M. J.; Zoła, S.; Liakos, A.; Dróżdż, M.; Winiarski, M.; Ogłoza, W.; Kozieł-Wierzbowska, D.; Provencal, J. L.; Nilsson, K.; Berdyugin, A.; Lindfors, E.; Reinthal, R.; Sillanpää, A.; Takalo, L. O.; Santangelo, M. M. M.; Salo, H.; Chandra, Sunil; Ganesh, S.; Baliyan, K. S.; Coggins-Hill, S. A.; Gopakumar, A.

doi:10.1088/0004-637x/764/1/5

Cited by 49 publications

(71 citation statements)

References 53 publications

(77 reference statements)

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“…The only exception is OJ 287 (z = 0.306), for which a regular flux brightening recurrence every ∼12 years was reported (Sillanpaa et al, 1988b;Takalo, 1994) and confirmed by the detection of 9 equally spaced maxima -of which the latest 4 are very well sampled -in the optical light curve so far (see Fig. 5; Sillanpää et al , 1996;Hudec et al, 2013;Pihajoki et al, 2013a). The period is ascribed to the presence of a binary system of massive black holes at the center of the nucleus, that produce outbursts, often accompanied by precursors, when approaching pericenter (Valtonen et al , 2008).…”

Section: Flux Variabilitymentioning

confidence: 78%

An optical view of BL Lacertae objects

Falomo

Pian²,

Treves

2014

Astron Astrophys Rev

137

109

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BL Lac objects are active nuclei, hosted in massive elliptical galaxies, the emission of which is dominated by a relativistic jet closely aligned with the line of sight. This implies the existence of a parent population of sources with a misaligned jet, that have been identified with low-power radiogalaxies. The spectrum of BL Lacs, dominated by non-thermal emission over the whole electromagnetic range, together with bright compact radio cores, high luminosities, rapid and large amplitude flux variability at all frequencies and strong polarization make these sources an optimal laboratory for high energy astrophysics. A most distinctive characteristic of the class is the weakness or absence of spectral lines, that historically hindered the identification of their nature and ever thereafter proved to be a hurdle in the determination of their distance. In this paper we review the main observational facts that contribute to the present basic interpretation of this class of active galaxies. We overview the history of the BL Lac objects research field and their population as it emerged from multi-wavelength surveys. The properties of the flux variability and polarization, compared with those at radio, X-ray and gamma-ray frequencies, are summarized together with the present knowledge of the host galaxies, their environments, and central black hole masses. We focus this review on the optical observations, that played a crucial role in the early phase of BL Lacs studies, and, in spite of extensive radio, X-ray, and recently gamma-ray observations, could represent the future major contribution to the unveiling of the origin of these sources. In particular they could provide a firm conclusion on the long debated issue of the cosmic evolution of this class of active galactic nuclei and on the connection between formation of supermassive black holes and relativistic jets.

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Section: Flux Variabilitymentioning

confidence: 78%

An optical view of BL Lacertae objects

Falomo

Pian²,

Treves

2014

Astron Astrophys Rev

137

109

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“…The response of the accretion disk to the orbiting secondary BH has been calculated by Sundelius et al (1997) [8] using non-interacting test particles to model the disk, and by Pihajoki et al (2013) [9] using particles interacting hydrodynamically. In this paper we refer to the latter simulation, which is summarized in Figure 4 of Pihajoki et al (2013) [9].…”

Section: Introductionmentioning

confidence: 99%

Polarization and Spectral Energy Distribution in OJ 287 during the 2016/17 Outbursts

et al. 2017

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Abstract:We report optical photometric and polarimetric observations of the blazar OJ 287 gathered during 2016/17. The high level of activity, noticed after the General Relativity Centenary flare, is argued to be part of the follow-up flares that exhibited high levels of polarization and originated in the primary black hole jet. We propose that the follow-up flares were induced as a result of accretion disk perturbations, travelling from the site of impact towards the primary SMBH. The timings inferred from our observations allowed us to estimate the propagation speed of these perturbations. Additionally, we make predictions for the future brightness of OJ 287.

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“…3) and data in R-band (Suhora Astronomical Observatory) [20]. A slight local flux increase can be seen in the period of November 2010 in the Fermi LAT data [21] and at R-band, which corresponds to the above-mentioned γ -ray flux increase observed by SHALON in 2010.…”

Section: Oj 287 (Z = 0306)mentioning

confidence: 79%

Very high energy emission sources beyond the Galaxy

et al. 2017

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Abstract. Active Galactic Nuclei (AGN) are considered as potential extragalactic sources of very and ultra high energy cosmic rays. According to theoretical predictions cosmic ray acceleration can take place at the shock created by the expanding cocoons around active galactic nuclei as well as at AGN jets. The measurements of AGN TeV spectra, the variability time scale of TeV emission can provide essential information on the dynamics of AGN jets, the localization of acceleration region and an estimation of its size. SHALON observations yielded data on extragalactic sources of different AGN types in the energy range of 800 GeV-100 TeV. The data from SHALON observations are compared with those from other experiments at high and very high energies.

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Precursor Flares in Oj 287

Cited by 49 publications

References 53 publications

An optical view of BL Lacertae objects

An optical view of BL Lacertae objects

Polarization and Spectral Energy Distribution in OJ 287 during the 2016/17 Outbursts

Very high energy emission sources beyond the Galaxy

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