X-Ray, UV, and Radio Timing Observations of the Radio Galaxy 3C 120

Marscher, A. P.; Jorstad, Svetlana G.; Williamson, Karen E.; Lähteenmäki, A.; Tornikoski, M.; Hunter, John M.; Leidig, K.; Mobeen, Muhammad Zain; Vera, R. J. C.; Chamani, Wara

doi:10.3847/1538-4357/aae4de

Cited by 15 publications

(10 citation statements)

References 66 publications

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“…Hence, the optical and X-ray emission are dominated by that from the accretion disccorona region while the radio emission is from the jet. Observations of these unique sources, have revealed similar connection between the motion of radio-bright superluminal knots seen in the pc-scale jets and the dips in the X-ray light curve (Marscher et al 2002;Chatterjee et al 2009Chatterjee et al , 2011Tombesi et al 2012;Marscher et al 2018). Blazars are a class of AGN with a prominent jet pointed within ∼10 • of our line of sight.…”

Section: Introductionmentioning

confidence: 81%

The accretion disc-jet connection in blazars

Mukherjee

Mitra

Chatterjee

2019

Monthly Notices of the Royal Astronomical Society

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The power spectral density (PSD) of the X-ray emission variability from the accretion disccorona region of black hole X-ray binaries and active galactic nuclei has a broken power-law shape with a characteristic break time-scale T B . If the disc and the jet are connected, the jet variability may also contain a characteristic time-scale related to that of the disc-corona. Recent observations of the blazar Mrk 421 have confirmed the broken power-law shape of the PSD of its jet X-ray variability. We model the time variability of a blazar, in which emitting particles are assumed to be accelerated by successive shock waves flowing down the jet with a varying inter-shock time-scale (T I S ). We investigate the possible relation between the characteristic time-scales in the disc and jet variability based on the above model, along with mathematically and physically simulated disc variability. We find that both the PSD of the jet and disc variability may have a broken power-law shape but the break time-scales are not related in general except only in systems with a small range of BH mass. The break in the jet and the disc PSD are connected to the interval between large amplitude outbursts in the jet (T I S ) and to the viscous time-scale in the disc, respectively. In frequency bands where multiple emission processes are involved or emission is from lower energy particles, the break in the PSD may not be prominent enough for detection.

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Section: Introductionmentioning

confidence: 81%

The accretion disc-jet connection in blazars

Mukherjee

Mitra

Chatterjee

2019

Monthly Notices of the Royal Astronomical Society

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“…Multi-wavelength photometric reverberation mapping using X-ray, optical, UV, and radio time series of actively accreting SMBHs, i.e., AGN, and stellar-mass black holes have yielded significant insights into the geometries of structures surrounding these systems (e.g., Edelson et al 2015;Marscher et al 2018;Gandhi et al 2008;O'Brien et al 2002;Chatterjee et al 2009). The underlying method in these studies is to first check for similarity in variability between two light curves derived from two distinct wavebands, and then measure time lags, if any, between them.…”

Section: Introduction and Methodologymentioning

confidence: 99%

Reverberation in Tidal Disruption Events: Dust Echoes, Coronal Emission Lines, Multi-wavelength Cross-correlations, and QPOs

et al. 2021

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Stellar tidal disruption events (TDEs) are typically discovered by transient emission due to accretion or shocks of the stellar debris. Yet this luminous flare can be reprocessed by gas or dust that inhabits a galactic nucleus, resulting in multiple reverberation signals. Nuclear dust heated by the TDE will lead to an echo at infrared wavelengths (1-10 μm) and transient coronal lines in optical spectra of TDEs trace reverberation by gas that orbits the black hole. Both of these signal have been detected, here we review this rapidly developing field. We also review the results that have been extracted from TDEs with high-quality X-ray light curves: quasi periodic oscillations (QPOs), reverberation lags of fluorescence lines, and cross-correlations with emission at other wavelengths. The observational techniques that are covered in this review probe the emission from TDEs over a wide range of scales: from $\sim 1$ ∼ 1 light year to the innermost parts of the newly formed accretion disk. They provide insights into important properties of TDEs such as their bolometric output and the geometry of the accretion flow. While reverberation signals are not detected for every TDE, we anticipate they will become more commonplace when the next generation of X-ray and infrared instruments become operational.

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“…Factors which determine the actual delay between accretion and jet changes include the disk/corona properties and geometry, the magnetic field geometry, and shock formation in the jet (e.g. Marscher et al 2018;Tchekhovskoy et al 2014;Valtonen et al 2019), which are not yet well understood, and we therefore cannot predict delays from first principles, but can compare with other extragalactic systems where delays were observed. Overall, the timescale observed in OJ 287 is consistent with the one seen in stellar tidal disruption events (Komossa & Zensus 2016) where accretion flares are typically followed by detectable radio-jet activity within days (e.g.…”

Section: Binary Black Hole Modelmentioning

confidence: 96%

The April-June 2020 super-outburst of OJ 287 and its long-term multiwavelength light curve with Swift: binary supermassive black hole and jet activity

Komossa¹,

Grupe²,

Parker³

et al. 2020

Preprint

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We report detection of a very bright X-ray-UV-optical outburst of OJ 287 in April-June 2020; the second brightest since the beginning of our Swift multi-year monitoring in late 2015. It is shown that the outburst is predominantly powered by jet emission. Optical-UV-X-rays are closely correlated, and the low-energy part of the XMM-Newton spectrum displays an exceptionally soft emission component consistent with a synchrotron origin. A much harder X-ray powerlaw component (Γ x = 2.4, still relatively steep when compared to expectations from inverse-Compton models) is detected out to 70 keV by NuSTAR. We find evidence for reprocessing around the Fe region, consistent with an absorption line. If confirmed, it implies matter in outflow at ∼0.1c. The multi-year Swift lightcurve shows multiple episodes of flaring or dipping with a total amplitude of variability of a factor of 10 in X-rays, and 15 in the optical-UV. The 2020 outburst observations are consistent with an after-flare predicted by the binary black hole model of OJ 287, where the disk impact of the secondary black hole triggers time-delayed accretion and jet activity of the primary black hole.

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X-Ray, UV, and Radio Timing Observations of the Radio Galaxy 3C 120

Cited by 15 publications

References 66 publications

The accretion disc-jet connection in blazars

The accretion disc-jet connection in blazars

Reverberation in Tidal Disruption Events: Dust Echoes, Coronal Emission Lines, Multi-wavelength Cross-correlations, and QPOs

The April-June 2020 super-outburst of OJ 287 and its long-term multiwavelength light curve with Swift: binary supermassive black hole and jet activity

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