Optical Flux and Colour Variability of Blazars in the ZTF Survey

Negi, Vibhore; Joshi, Ravi; Chand, Krishan; Chand, Hum; Wiita, Paul; Ho, Luis C.; Singh, Ravi S.

doi:10.48550/arxiv.2112.00790

Cited by 1 publication

(1 citation statement)

References 38 publications

(61 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This degree of achromaticity is unusual for AGN. It is worth mentioning a very recent work (Negi et al 2021) finding chromatic variability in blazars, in particular. Although our results apply to more general AGN, we discuss applications of our results to blazars in §5.4.…”

Section: Signatures Of a Binarymentioning

confidence: 96%

Multiband light curves from eccentric accreting supermassive black hole binaries

Westernacher-Schneider

Zrake

MacFadyen

et al. 2022

Phys. Rev. D

View full text Add to dashboard Cite

We use long-run, high-resolution hydrodynamics simulations to compute the multi-wavelength light curves (LCs) from thermal disk emission around accreting equal-mass supermassive black hole (BH) binaries, with a focus on revealing binary eccentricity. LCs are obtained by modeling the disk thermodynamics with an adiabatic equation of state, a local blackbody cooling prescription, and corrections to approximate the effects of radiation pressure. We find that modulation of multi-band LCs on the orbital time scale are generally in-phase (to within ∼ 2% of a binary orbital period), but they contain pulse substructure in the time domain that is not necessarily reflected in BH accretion rates Ṁ . We thus predict that binary-hosting AGN will exhibit highly correlated, in-phase, periodic brightness modulations in their low-energy disk emission. However, detectability of these modulations in multi-wavelength observing campaigns could be compromised because observed stochastic variability in AGNs typically has a higher amplitude than our proposed signal. It is possible that observations over temporal baselines of many binary periods may make the signal more prominent, but this would need to be analyzed carefully. If jet emission is predicted by Ṁ , then we predict a weaker correlation with low-energy disk emission due to the differing sub-peak structure. For the binary parameters we explore, we show that LC variability due to hydrodynamics likely dominates Doppler brightening for all equal-mass binaries with disk Mach numbers 20. A promising signature of eccentricity is weak or absent "lump" periodicity. We find hints that a significant lag exists between Ṁ and low-energy disk emission for circular binaries, but they are in-phase for eccentric binaries, which might explain some "orphan" blazar flares with no γ-ray counterpart.

show abstract

Section: Signatures Of a Binarymentioning

confidence: 96%