The activity of the blazar OJ 287 in 2005: XMM-Newton observations and coordinated campaign

Ciprini, S.; Raiteri, C. M.; Rizzi, N.; Agudo, I.; Foschini, L.; Fiorucci, M.; Takalo, L. O.; Villata, M.; Sillanpää, A.; Valtonen, M. J.; Ostorero, L.; Tosti, G.; Wagner, S. J.

doi:10.1063/1.2757335

Cited by 12 publications

(21 citation statements)

References 4 publications

(5 reference statements)

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“…7, and other XMM-Newton data available are consistent with them. The flux estimated with Swift-XRT is consistent with that of XMM-Newton (Ciprini et al 2007a), but the low statistics due to the short exposure observations Swift does not allow us to look for a possible energy break in the Swift-XRT spectra of OJ 287 (Ciprini et al 2007b;Ciprini et al 2008, in prep.). As shown in Fig.…”

Section: Oj 287supporting

confidence: 56%

Swift observations of IBL and LBL objects

Massaro

Giommi

Tosti

et al. 2008

A&A

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173

274

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Context. BL Lacs are an enigmatic class of active galactic nuclei (AGNs), characterized by the non-thermal continuum typically attributed to synchrotron and inverse Compton emission. Depending on the frequency location of the maxima of these components, they are subdivided into three subclasses LBLs, IBLs, and HBLs. We present the results of a set of observations of eight BL Lac objects of LBL and IBL type performed by the XRT and UVOT detectors onboard the Swift satellite between January 2005 and November 2006. Aims. We are mainly interested in measuring the spectral parameters, and particularly the steepness between the UV and the X-ray band, useful for determining the classification of these sources. We compare the behavior of these sources with previous XMM-Newton, BeppoSAX observations and with historical data in the X-ray and in the optical band. We are also interested in classifying the sources in our sample on the basis of the Swift observations and comparing them with their classification presented in literature.Methods. We performed X-ray spectral analysis of observed BL Lac objects using a simple powerlaw and in a few cases the logparabolic model. We also combined the UV emission with the low energy X-ray data to describe their spectral energy distribution. Results. We used Swift observational data to classify sources in our sample and derived parameters of their spectral energy distribution. Conclusions. We found that for the IBLs X-rays low states show features of the high energy component, usually interpreted as due to inverse Compton emission. Sources in our sample exhibit a range of temporal UV and X-ray behaviors, some objects having clear and neat correlated UV and X-ray variations (e.g. ON231) and other objects showing no clear (e.g. AO 0235+164) UV and X-ray correlation. Finally, we also note that our estimates of spectral curvature are in the range of that measured for the High frequency peaked BL Lac objects (HBLs).

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Section: Oj 287supporting

confidence: 56%

Swift observations of IBL and LBL objects

Massaro

Giommi

Tosti

et al. 2008

A&A

Self Cite

173

274

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“…Wang & Dai (2013) found that X-ray flares from GRBs show SOC behavior. Whether or not SOC characteristics exist in X-ray flares in black hole systems other than GRBs remains unclear, although some hints have been found (Mineshige et al 1994;Takeuchi et al 1995;Negoro et al 1995;Ciprini et al 2003;Zhang 2007).…”

Section: Introductionmentioning

confidence: 99%

Universal Behavior of X-Ray Flares From Black Hole Systems

Wang¹,

Dai²,

Yi³

et al. 2014

ApJS

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X-ray flares have been discovered in black hole systems such as gamma-ray bursts, the tidal disruption event Swift J1644+57, the supermassive black hole Sagittarius A * at the center of our Galaxy, and some active galactic nuclei. Occurrences of X-ray flares are always accompanied by relativistic jets. However, it is still unknown whether or not there is a physical analogy among such X-ray flares produced in black hole systems spanning nine orders of magnitude in mass. Here, we report observed data of X-ray flares and show that they have three statistical properties similar to solar flares, including power-law distributions of their energies, durations, and waiting times, which can be explained by a fractal-diffusive, self-organized criticality model. These statistical similarities, together with the fact that solar flares are triggered by a magnetic reconnection process, suggest that all of the X-ray flares are consistent with magnetic reconnection events, implying that their concomitant relativistic jets may be magnetically dominated.

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“…Such data also corroborated the sub-parsec binary SMBH hypothesis, where optical/UV/X-ray data have evidenced the separation between un-boosted spectral component dominated by thermal bremsstrahlung emission from hot (3 × 10 5 • K) gas and the relativistically beamed in-jet, nonthermal, X-ray emission. The results where obtained thanks to XMM-Newton EPIC and OM observations [1,13,12], and to Swift XRT and UVOT data [14] based on Guest Observer programs and several ToO proposals. The dedicated Swift time-domain experiment is continuing since winter 2015 trough 2016 and 2017 thanks to several observing proposals and ToOs.…”

Section: Some Recent Resultsmentioning

confidence: 99%

“…The optical monitor and multifrequency data obtained with coordinated observing campaigns 2 performed in the years between 2005 and 2008 [1] allowed, in particular, to test the Einstein's General Relativity (GR) theory in strong-field conditions [11] through light curve timing (clocking). Such data also corroborated the sub-parsec binary SMBH hypothesis, where optical/UV/X-ray data have evidenced the separation between un-boosted spectral component dominated by thermal bremsstrahlung emission from hot (3 × 10 5 • K) gas and the relativistically beamed in-jet, nonthermal, X-ray emission.…”

Section: Some Recent Resultsmentioning

confidence: 99%

“…High-energy observations at X-ray bands (BeppoSAX, XMM-Newton, Suzaku, Swift, [5,1,14] ) and gamma-ray bands (Fermi all-sky survey and continuous monitoring since Aug. 2008) are now contributing to enlarge the physical picture on this peculiar extragalactic source, and are contributing to increase the power of synergetic multifrequency analysis. …”

Section: Pos(ifs2017)041mentioning

confidence: 99%

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Time-domain behavior of blazar OJ 287 and the binary supermassive black hole conjecture

Ciprini

Valtonen

Zoła³

et al. 2017

Proceedings of 7th International Fermi Symposium — PoS(IFS2017)

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The proper understanding of blazar variability at the various electromagnetic spectral bands is one goal of multifrequency astrophysics. In this frame a peculiar and controversial phenomenology is the periodicity, postulated for long-term radio or optical flux light curves of about a dozen of blazars. The well-known BL Lac object OJ 287 (PKS 0851+202, S3 0851+20, PG 0851+202, z = 0.306) is not only a high-variable, peculiar, extragalactic source with hints for approximatively cyclical optical outbursts, but it also represents a case of substantial intensive and extensive (longterm) multifrequency observations. This rich database allow us a deeper analysis based on a wide range of variability timescales with some recent results that are highlighted here.

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The activity of the blazar OJ 287 in 2005: XMM-Newton observations and coordinated campaign

Cited by 12 publications

References 4 publications

Swift observations of IBL and LBL objects

Swift observations of IBL and LBL objects

Universal Behavior of X-Ray Flares From Black Hole Systems

Time-domain behavior of blazar OJ 287 and the binary supermassive black hole conjecture

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