Exploring the nature of the jetted hybrid AGNs: PKS 2004-447, 3C 286 and PKS 0440-00 through the SED modeling

TL;DR

This study models the spectral energy distributions of three jetted AGNs to understand their classifications and jet properties, revealing differences in emission mechanisms and jet dominance based on viewing angles and source types.

Contribution

It introduces a comprehensive SED modeling approach for hybrid AGNs, providing insights into their jet composition, emission processes, and classification based on physical parameters.

Findings

PKS 2004-447 shows SSC-dominated emission at large angles.

3C 286's jet viewed at ~7 degrees impacts gamma-ray emission.

PKS 0440-00 is classified as a powerful gamma-NLS1 with a jet dominated by bulk motion.

Abstract

In this work, we explore the connection of three jetted $\gamma-$loud AGNs classes: Compact Steep-Spectrum Sources (CSS), Narrow-Line Seyfert 1 (NLS1), and Flat-Spectrum Radio Quasars, through the modeling of the spectral energy distribution (SED). We selected two sources identified as CSS/NLS1 hybrids, PKS 2004-440 and 3C 286. Additionally, we included the source PKS 0440-00, initially classified as an FSRQ in the first Fermi-LAT catalog, but recently reclassified as an NLS1. We present the results of their broadband SED modeling using a one-zone leptonic synchrotron-self Compton (SSC)+external Compton (EC) model. By exploring the parameter space and investigating the disk-jet connection in these sources, we analyze their classification in a model-dependent way. Our findings reveal that modeling PKS 2004-447 at relatively large angles, as expected for CSS, results in an SSC-dominated inverse Compton emission. In contrast, at low observing angles, the inverse Compton emission is dominated by external photon fields. Both scenarios result in a jet with a low radiative power. For 3C 286 we found that using a one-zone model limits the jet viewing angle to $\sim7^{\circ}$, mainly due to its impact on the $\gamma$-ray emission. Our model results show a magnetically dominated jet, consistent with $\gamma$-CSS sources. Our results suggest that PKS 0440-00, can be classified as a powerful $\gamma-$NLS1, characterized by high accretion power and a jet dominated by bulk motion, similar to FSRQs.