A Deep 150 MHz GMRT Survey in Eridanus

TL;DR

This paper reports a deep 150 MHz GMRT survey of the Eridanus field, detecting 113 sources, including potential high-redshift radio galaxies, and compares the source counts with other low-frequency surveys.

Contribution

It provides a higher resolution, deeper 150 MHz survey of Eridanus, identifying candidate high-redshift galaxies and analyzing source counts in comparison with other surveys.

Findings

Detected 113 sources, including 20 extended sources.

Identified 5 ultra steep spectrum sources as high-redshift candidates.

Derived and compared the source count distribution with other surveys.

Abstract

We present results of a 150 MHz survey of a field centered on Epsilon Eridani, undertaken with the Giant Metrewave Radio Telescope (GMRT). The survey covers an area with a diameter of 2 deg, has a spatial resolution of 30" and a noise level of 3.1 mJy at the pointing centre. These observations provide a deeper and higher resolution view of the 150 MHz radio sky than the 7C survey (although the 7C survey covers a much larger area). A total of 113 sources were detected, most are point-like, but 20 are extended. We present an analysis of these sources, in conjunction with the NVSS (at 1.4 GHz) and VLSS (at 74 MHz). This process allowed us to identify 5 Ultra Steep Spectrum (USS) radio sources that are candidate high redshift radio galaxies (HzRGs). In addition, we have derived the dN/dS distribution for these observations and compare our results with other low frequency radio surveys.