More discoveries of compact radio cores in Seyfert galaxies with the EVN

TL;DR

This study enhances understanding of Seyfert galaxy cores by detecting compact radio sources using EVN, revealing their prevalence and properties at multiple frequencies, with implications for galaxy core activity.

Contribution

The paper reports new detections of compact radio cores in additional Seyfert galaxies using EVN, expanding the sample and including Arecibo data for better source compactness analysis.

Findings

Detection of three new compact radio sources in Seyfert galaxies.

Use of EVN at 1.6 and 5 GHz to characterize source emission.

Inclusion of Arecibo improves understanding of emission region compactness.

Abstract

Following the high detection rate achieved by EVN observations of the central regions of local Seyfert galaxies (Giroletti & Panessa 2009, ApJL 706, 260), we have targeted a few additional sources from a complete sample. We have detected three more sources (NGC 3982, NGC 3227, and NGC 4138) at both 1.6 and 5 GHz and present preliminary results. Moreover, the declination of the sources was suitable to include Arecibo in the EVN observations, which provides important clues on the compactness of the emission region.