High Frequency Peakers: The Faint Sample

TL;DR

This paper introduces a new sample of faint high-frequency peaking radio sources, expanding the known population and providing detailed spectral data to study their properties.

Contribution

It presents the first faint HFP sample with flux densities between 50 and 300 mJy, including VLA observations to confirm their spectral characteristics.

Findings

Confirmed 61 HFP sources with convex spectra

Extended the HFP sample to lower flux densities

Provided detailed spectral data from 1.4 to 22 GHz

Abstract

We present a sample of sources with convex radio spectra peaking at frequencies above a few GHz, known as "High Frequency Peakers" (HFPs). A "bright" sample with a flux density limit of 300 mJy at 5 GHz has been presented by Dallacasa et al. (2000). Here we present the "faint" sample with flux density between 50 and 300 mJy at 5GHz, restricted to the area around the North Galactic Cap, where the FIRST catalogue is available. The candidates have been observed with the VLA at several frequencies ranging from 1.4 to 22 GHz, in order to derive a simultaneous radio spectrum. The final list of confirmed HFP sources consists of 61 objects.