South African Radio Astronomy Observatory

Detection of relativistic orbital deformation from improved timing of PSR J1757−1854

Abstract PSR J1757−1854, a 21.5 ms pulsar is a member of a highly relativistic double neutron star (DNS) system with a tight (4.4 hr), eccentric (e = 0.61) orbit. With extremely large gravitational wave luminosity and one of the fastest orbital decay rates of any known DNS system...

Studies of Two Post Common Envelope Binary Stars

Abstract New time series photometry of the short period (P < 0.2 d) binary stars ZTF J032906.36+070408.3 (ZTF 0329) and ATO J090.7238+00.5996 (ATL 0602) is presented. The primary (hotter) stars in both systems are white dwarfs, while the cooler stars are M dwarfs. Archival photom...

A search for high-redshift radio galaxy candidates with the MeerKAT Galaxy Cluster Legacy Survey

Abstract High-redshift radio galaxies (HzRGs) are among the earliest and most massive galaxies whose powerful radio emission allows us to probe the large-scale structure, galaxy evolution, and the epoch of reionisation. We present a new sample of HzRG candidates constructed using...

A complete correspondence between the Newman–Penrose and 1+1+2 formalisms

Abstract We establish a correspondence between the Newman–Penrose and 1+1+2 semitetrad covariant formalisms by expressing all Newman–Penrose spin coefficients, Ricci scalars, and Weyl scalars in terms of the scalar, vector, and tensor variables of the 1+1+2 decomposition. In addi...

eRASSU J043115.8-711730 The first pulsating symbiotic super-soft X-ray source in the Magellanic Bridge

Abstract The Magellanic Bridge stellar population is a relic of the tidal interaction between the Large and Small Magellanic Clouds. A comprehensive view of the evolution of the Bridge stellar population requires probing the compact remnants of stellar evolution, otherwise hidden...