A search for radio counterparts to Chandra ULX candidates

TL;DR

This study systematically searches for radio counterparts to ULX candidates from Chandra data, identifying seven potential radio associations and discussing three promising cases within close proximity.

Contribution

It provides the first systematic cross-correlation between ULX candidates and radio survey data, identifying potential radio counterparts.

Findings

Seven ULX candidates have associated radio emission peaks.

Three ULX candidates are within 5" of radio peaks, suggesting possible physical association.

The paper discusses these three cases in detail.

Abstract

We present a systematic search for radio counterparts to Ultra Luminous X-ray (ULX) source candidates based on a cross-correlation of the Swartz et al. (2004) ULX catalogue based on Chandra data and the FIRST radio survey. We find seven cases of conspiscuous peaks of radio emission that could be associated to ULX sources. Among these seven ULX radio candidates, three X-ray sources are located within 5" of the FIRST radio peaks. These three cases are shown and discussed individually.