Spectral modelling of 1 ES 1218+30.4

TL;DR

This paper models the multiwavelength emission of the blazar 1 ES 1218+30.4 using a time-dependent synchrotron-self-Compton approach, inferring physical parameters and confirming sub-Eddington jet power consistent with BL Lac objects.

Contribution

It introduces a detailed spectral model incorporating host galaxy emission to better understand blazar emission mechanisms.

Findings

Model fits the multiwavelength data well

Inferred parameters align with Fermi acceleration

Jet power is sub-Eddington, consistent with BL Lac objects

Abstract

We employ a time-dependent synchrotron-self-Compton code for modeling contemporaneous multiwavelength data of the blazar 1 ES 1218+30.4 The input parameters of the model are used to infer physical parameters of the emitting region. An acceptable fit to the data is obtained by taking into account a stellar emission component in the optical regime due to the host galaxy. The physical parameters inferred from the fit are in line with particle acceleration due to the Fermi mechanism providing s = 2.1 spectra. From the properties of the host galaxy in the optical, we estimate the central black hole mass and thus confirm that the jet power injected into the emission region is in the sub-Eddington regime, as expected for BL Lacertae objects.