# TRAPUM upper limits on pulsed radio emission for SMC X-ray pulsar J0058-7218

**Authors:** E. Carli, L. Levin, B. W. Stappers, E. D. Barr, R. P. Breton, S. Buchner, M. Burgay, M. Kramer, P. V. Padmanabh, A. Possenti, V. Venkatraman Krishnan, J. Behrend, D. J. Champion, W. Chen, Y. P. Men  
**arXiv:** [2210.04785](https://arxiv.org/abs/2210.04785)  
**Date:** 2022-10-10  
**Summary page:** https://www.summarizepaper.com/fr/paper/2210.04785v1/

## Abstract

The TRAPUM collaboration has used the MeerKAT telescope to conduct a search for pulsed radio emission from the young Small Magellanic Cloud pulsar J0058-7218 located in the supernova remnant IKT 16, following its discovery in X-rays with XMM-Newton. We report no significant detection of dispersed, pulsed radio emission from this source in three 2-hour L-band observations using the core dishes of MeerKAT, setting an upper limit of 7.0 {\mu}Jy on its mean flux density at 1284 MHz. This is nearly 7 times deeper than previous radio searches for this pulsar in Parkes L-band observations. This suggests that the radio emission of PSR J0058-7218 is not beamed towards Earth or that PSR J0058-7218 is similar to a handful of Pulsar Wind Nebulae systems that have a very low radio efficiency, such as PSR B0540-6919, the Large Magellanic Cloud Crab pulsar analogue. We have also searched for bright, dispersed, single radio pulses and found no candidates above a fluence of 93 mJy ms at 1284 MHz.