Power Spectral Distribution of the BL Lac Object S5 0716+714

TL;DR

This study analyzes the power spectral distribution of the BL Lac object S5 0716+714 across multiple bands, confirming turbulence and evaluating disk models, with a focus on spectral slopes and model fitting.

Contribution

It introduces a specific PSD model fit to observational data and assesses the applicability of disk models to explain the variability.

Findings

Spectral slopes range from 1.083 to 2.65, indicating turbulence.

Standard and magnetized disk models are unlikely to explain the data.

The source exhibits turbulent behavior consistent with previous studies.

Abstract

Observational data in the BVRI bands of the variable BL Lacertae Object S5 0716+714 is discussed from the point of view of its Power Spectral Distribution (PSD). A model of the type $P(f) = \beta f^{-1} [1 + (\frac{f} {\delta}) ^{\alpha -1}]^{-1} + \gamma $ is fitted to the data for four null hypothesis and the Bayesian $p$ parameter for the fits is calculated. Spectral slopes with values ranging from 1.083 to 2.65 are obtained, with medium values for each band of $\bar{\alpha}_B =2.028$, $\bar{\alpha}_V = 1.809$, $\bar{\alpha}_R = 1.932$ and $\bar{\alpha}_I = 1.54$ respectively. These values confirm conclusions of previous studies, namely that the source is turbulent. Two disk models, the standard prescription of the Shakura-Sunyaev disk and magnetized disks exhibiting MagnetoRotational Instability, were discussed. We found that it is unlikely that they explain this set of observational data.