A puzzle of radio-quiet quasar PG 1407+265: are optical and X-ray emissions produced from relativistic jet?

TL;DR

This study investigates whether optical and X-ray emissions in the radio-quiet quasar PG 1407+265 originate from a relativistic jet by modeling its emissions and comparing with gamma-ray observations.

Contribution

It introduces a synchrotron + SSC model to analyze emission origins and constrains jet parameters using gamma-ray upper limits, challenging the jet-origin hypothesis for optical and X-ray emissions.

Findings

Optical and X-ray emissions may not originate from the relativistic jet.

Gamma-ray upper limits constrain the energy density ratio, ruling out very high values.

The emissions are likely produced by non-thermal processes unrelated to beaming jets.

Abstract

PG 1407+265 is a radio quiet quasar but has a relativistic jet. In this report, we show some peculiar properties of its optical and X-ray emissions, which indicate their possible non-thermal origins produced from jet. We use a simple synchrotron + synchrotron self Compton (SSC) model to fit the emissions with different ratios of energy densities between magnetic field and electrons (\eta=UB/Ue), which predict different {\gamma}-ray luminosity. The First LAT AGN Catalog (1LAC) did not include PG 1407+265, which indicates an upper limit of {\gamma}-ray luminosity. This upper limit constrains the ratio unreasonable large (\eta>10^4-10^5). This inversely indicates that the optical and X-ray emissions may be not produced from the beaming jet. We discuss the physical implications of these results.