OJ 287 - Binary pair of supermassive black holes

Sillanpää, A.; Haarala, S.; Valtonen, M. J.; Sundelius, B.; Byrd, G. G.

doi:10.1086/166033

Cited by 631 publications

(667 citation statements)

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“…In BL Lac, an accretion disk has indeed been proposed by Corbett et al (1996) and Corbett et al (2000) as the powering source of the observed, variable Hα emission line. The presence of an accretion disk in OJ 287 has been invoked to explain the observed flux and spectral variability (Sillanpää et al 1988;Kidger et al 1991;Katz 1997). However, the P ν of OJ 287 in past polarimetric monitorings in optical bands has not been systematically negative (see e.g.…”

Section: Discussionmentioning

confidence: 99%

Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope

Tommasi

Palazzi

Pian

et al. 2001

A&A

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Abstract. Optical polarization of seven selected BL Lac objects in UBV RI bands was studied with the Nordic Optical Telescope from December 10-14, 1999. Two of them, 3C 66A and PKS 0735+178, were monitored for 4 nights for a total integration time of 4.75 and 5.5 hours, respectively. Other objects (1 Jy 0138−097, H 0414+009, PKS 0823−223, OJ287 and BL Lac) were observed sparsely during the run. Apart from PKS 0823−223 (more polarized than observed in the past), the sources show levels of flux and polarization consistent with results at previous epochs. 3C 66A and PKS 0735+178 were intensively observed during December 11 and 12 and exhibited variability of polarization, both on internight and intranight time scales. Wavelength dependence of polarization has been investigated, as well as circular polarization. The results are discussed within the standard model for BL Lacs.

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Section: Discussionmentioning

confidence: 99%

Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope

Tommasi

Palazzi

Pian

et al. 2001

A&A

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“…In the optical there is strong evidence of a period of about 12 years which is explained by a binary black hole system [13,14] We have observed OJ 287 during the two campaigns (March and October). The variation of polarization in the q-u plane is presented in Fig.…”

Section: Oj 287 (0851+2020)mentioning

confidence: 82%

Near infrared polarimetry of a sample of blazars^*

Pulido

Pereyra

Agudo

et al. 2013

EPJ Web of Conferences

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Abstract. Polarization variability is one of the most ubiquitous characteristic of blazars. Near infrared (NIR) polarization measurements of blazars are not common, contrary to the optical ones. Nonetheless, the NIR regime can be essential to understand correlated or non-correlated behaviour between the optical and radio energy ranges. In this work, we report on NIR polarimetry measurements of a sample of 28 blazars, collected with LIRIS at WHT/La Palma in several campaigns during 2011. The majority of the blazars were observed more than one epoch using two filters (J and Ks). Here we present preliminary results for few selected targets.

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“…A BBH system may produce a precessing jet base (e.g., Yokosawa & Inoue 1985;Romero et al 2003;Roland et al 2008;Kaastra & Roos 1992) and thus a bent jet. The detected periodicities in the light curves may also be caused by a BBH (e.g., Lehto & Valtonen 1996;Sillanpaa et al 1988;Qian et al 2007;Caproni & Abraham 2004). Finally, there is a number of more indirect evidence possibly connected to these systems (e.g., Komossa 2006).…”

Section: Binary Black Hole System Properties and Identification Criteriamentioning

confidence: 97%

Tracing the merger-driven evolution of active galaxies using the CJF sample

Karouzos¹,

Britzen²,

Eckart

et al. 2010

A&A

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Context. For the evolution of large-scale structures in the Universe, it is unclear whether active galaxies represent a phase that each galaxy undergoes, and whether and to which extent the evolution of black holes at their centers is important. Binary black hole (BBH) systems may play a key role in our understanding of the above questions. Aims. We investigate the Caltech-Jodrell Bank flat-spectrum (CJF) sample to identify evidence that supports the merger-driven evolution scheme of active galaxies, and search for tracer-systems of active galactic nucleus (AGN) evolution and possible BBH candidates. We discuss the strength of and uncertainty in the evidence and formulate a set of selection criteria to detect such tracer-systems. Methods. We conduct an extensive literature search for all available multiwavelength data, particularly in the optical and infrared regime, and morphological information about the CJF sources. We perform a statistical analysis of the properties of this sample. Results. We find 1 ULIRG (Mrk 231) included in the CJF prototype of a transitory system. In total, 28.6% of the CJF sources with z ≤ 0.4 are distorted or have a companion. Given the unbiased sample used here, this provides strong evidence of the ubiquity of the merger phenomenon in the context of active galaxies. We find a correlation between the radio and the near-infrared luminosity of the high-luminosity sources, interpreted in the context of the interplay between a star-formation and AGN component. We find a connection between variability and evolutionary transitory systems, as selected on the basis of their near-infrared colors. We select 28 sources that trace the different evolution phases of an AGN, as well as a number of the most promising BBH candidates. We find 4 sources with almost periodical variability in the optical and radio on similar timescales.

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OJ 287 - Binary pair of supermassive black holes

Cited by 631 publications

References 0 publications

Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope

Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope

Near infrared polarimetry of a sample of blazars^*

Tracing the merger-driven evolution of active galaxies using the CJF sample

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OJ 287 - Binary pair of supermassive black holes

Cited by 631 publications

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Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope

Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope

Near infrared polarimetry of a sample of blazars*

Tracing the merger-driven evolution of active galaxies using the CJF sample

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Resources

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Near infrared polarimetry of a sample of blazars^*